ScrollView,ListView,GrideView,RecyclerView,ViewPager等多种view嵌套问题

小咪咪 2022-07-12 11:36 283阅读 0赞

## 在开发中各种滑动布局的view如ScrollView,ListView等非常常用，但是你也会发现各种奇怪问题产生。网上的解决方法有很多种，但是杂而不全,根据个人经验现在列出常见问题以及代码最少最简单的解决方法,首先你要了解事件的分发机制及事件冲突,这里不再赘述。(其他继承自AbsListView的类也适用，包括ExpandableListView、GridView等等) ##

*  ## ScrollView嵌套ListView冲突问题的最优解决方案 ##

<table style="margin:0.667rem 0px; border-collapse:collapse; border:1px solid rgb(187,187,187); color:rgb(0,0,0); font-family:Helvetica,&quot;Hiragino Sans GB&quot;,&quot;Microsoft Yahei&quot;,SimSun,SimHei,arial,sans-serif; font-size:15px; line-height:24px"> 
 <tbody> 
 <tr> 
 <td style="border-collapse:collapse; border:1px solid rgb(187,187,187); word-break:break-all"> <p style="font-family:&quot;Helvetica Neue&quot;,Helvetica,Tahoma,Arial,STXihei,&quot;Microsoft YaHei&quot;,微软雅黑,sans-serif; font-size:16px; margin-top:0px; margin-bottom:0.75em; line-height:1.7em; text-indent:1em; color:rgb(51,51,51); background-color:rgb(254,254,254)"> ScrollView嵌套ListVew或者GridView等很常用，下面来说解决版本 <p style="font-family:&quot;Helvetica Neue&quot;,Helvetica,Tahoma,Arial,STXihei,&quot;Microsoft YaHei&quot;,微软雅黑,sans-serif; font-size:16px; margin-top:0px; margin-bottom:0.75em; line-height:1.7em; text-indent:1em; color:rgb(51,51,51); background-color:rgb(254,254,254)"> 问题一&nbsp;：&nbsp;嵌套在&nbsp;ScrollView的&nbsp;ListVew数据显示不全，我遇到的是最多只显示两条已有的数据。 <p style="font-family:&quot;Helvetica Neue&quot;,Helvetica,Tahoma,Arial,STXihei,&quot;Microsoft YaHei&quot;,微软雅黑,sans-serif; font-size:16px; margin-top:0px; margin-bottom:0.75em; line-height:1.7em; text-indent:1em; color:rgb(51,51,51); background-color:rgb(254,254,254)"> 解决办法：重写&nbsp;ListVew或者&nbsp;GridView，网上还有很多若干解决办法，但是都不好用或者很复杂。 <pre style="margin-top:0.667rem; margin-bottom:0.667rem; background-color:rgb(247,247,249); border:1px solid rgb(225,225,232); font-size:13px; line-height:19px; overflow:auto; padding:10px; word-wrap:break-word; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace">
 
 
 <ol style="margin:0px; padding-left:2.13rem; color:rgb(30,52,123)">
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%">@Override</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"></code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%">/** &nbsp; 只重写该方法，达到使ListView适应ScrollView的效果 &nbsp; */ </code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"></code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%">protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { </code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"></code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%">int expandSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE &gt;&gt; 2,</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"></code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%">MeasureSpec.AT_MOST);</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"></code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%">super.onMeasure(widthMeasureSpec, expandSpec);</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"></code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%">} </code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%">这个方法有一个同样的毛病，就是默认显示的首项是ListView，需要手动把ScrollView滚动至最顶端 </code></li>
 
 </ol></pre> <p style="font-family:&quot;Helvetica Neue&quot;,Helvetica,Tahoma,Arial,STXihei,&quot;Microsoft YaHei&quot;,微软雅黑,sans-serif; font-size:16px; margin-top:0px; margin-bottom:0.75em; line-height:1.7em; text-indent:1em; color:rgb(51,51,51); background-color:rgb(254,254,254)"> <p style="font-family:&quot;Helvetica Neue&quot;,Helvetica,Tahoma,Arial,STXihei,&quot;Microsoft YaHei&quot;,微软雅黑,sans-serif; font-size:16px; margin-top:0px; margin-bottom:0.75em; line-height:1.7em; text-indent:1em; color:rgb(51,51,51); background-color:rgb(254,254,254)"> 问题二&nbsp;、打开套有&nbsp;ListVew的&nbsp;ScrollView的页面布局&nbsp;默认&nbsp;起始位置不是最顶部。 <p style="font-family:&quot;Helvetica Neue&quot;,Helvetica,Tahoma,Arial,STXihei,&quot;Microsoft YaHei&quot;,微软雅黑,sans-serif; font-size:16px; margin-top:0px; margin-bottom:0.75em; line-height:1.7em; text-indent:1em; color:rgb(51,51,51); background-color:rgb(254,254,254)"> 解决办法有两种都挺好用： <p style="font-family:&quot;Helvetica Neue&quot;,Helvetica,Tahoma,Arial,STXihei,&quot;Microsoft YaHei&quot;,微软雅黑,sans-serif; font-size:16px; margin-top:0px; margin-bottom:0.75em; line-height:1.7em; text-indent:1em; color:rgb(51,51,51); background-color:rgb(254,254,254)"> 一是把套在里面的Gridview&nbsp;或者&nbsp;ListVew&nbsp;不让获取焦点即可。 <p style="font-family:&quot;Helvetica Neue&quot;,Helvetica,Tahoma,Arial,STXihei,&quot;Microsoft YaHei&quot;,微软雅黑,sans-serif; font-size:16px; margin-top:0px; margin-bottom:0.75em; line-height:1.7em; text-indent:1em; color:rgb(51,51,51); background-color:rgb(254,254,254)"> gridview.setFocusable(false);&nbsp;listview.setFocusable(false); <p style="font-family:&quot;Helvetica Neue&quot;,Helvetica,Tahoma,Arial,STXihei,&quot;Microsoft YaHei&quot;,微软雅黑,sans-serif; font-size:16px; margin-top:0px; margin-bottom:0.75em; line-height:1.7em; text-indent:1em; color:rgb(51,51,51); background-color:rgb(254,254,254)"> 注意：在xml布局里面设置android：focusable=“false”不生效 <p style="font-family:&quot;Helvetica Neue&quot;,Helvetica,Tahoma,Arial,STXihei,&quot;Microsoft YaHei&quot;,微软雅黑,sans-serif; font-size:16px; margin-top:0px; margin-bottom:0.75em; line-height:1.7em; text-indent:1em; color:rgb(51,51,51); background-color:rgb(254,254,254)"> 方法二：网上还查到说可以设置myScrollView.smoothScrollTo(0,0); </td> 
 </tr> 
 </tbody> 
</table>

* 看错误的布局代码: 
 <ScrollView
    android:id="@+id/act_solution_1_sv"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
 <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">
 <TextView
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:text="\nListView上方数据\n" />
 <ListView
            android:id="@+id/act_solution_1_lv"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content">
 </ListView>
 <TextView
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:text="\nListView下方数据\n" />
 </LinearLayout>
 </ScrollView>
 
 
 ScrollView中只能放一个控件，一般都放LinearLayout，orientation属性值为vertical。
 
 在LinearLayout中放需要呈现的内容。ListView也在其中，ListView的高度设为适应自身内容（wrap_content
 
 原因就是scroll事件的消费处理以及ListView控件的高度设定问题
 
 
 
 * ### ViewPager和ScrollView嵌套滚动问题解决方案 ###
 * 嵌套是ViewPager-->ScrollView-->ViewPager.
 
 public class HorizontalInnerViewPager extends ViewPager { 
    /** 触摸时按下的点 **/
    PointF downP = new PointF();
    /** 触摸时当前的点 **/
    PointF curP = new PointF();
 
    /** 自定义手势**/
    private GestureDetector mGestureDetector;
 
    public HorizontalInnerViewPager(Context context, AttributeSet attrs) { 
        super(context, attrs);
        mGestureDetector = new GestureDetector(context, new XScrollDetector());
    }
    public HorizontalInnerViewPager(Context context) { 
        super(context);
 
        mGestureDetector = new GestureDetector(context, new XScrollDetector());
    }
 
    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) { 
        return super.onInterceptTouchEvent(ev);//default
        //当拦截触摸事件到达此位置的时候，返回true，
        //说明将onTouch拦截在此控件，进而执行此控件的onTouchEvent
 //        return true;
        //接近水平滑动时子控件处理该事件，否则交给父控件处理
 //        return mGestureDetector.onTouchEvent(ev);
    }
 
    @Override
    public boolean onTouchEvent(MotionEvent ev) { 
        //每次进行onTouch事件都记录当前的按下的坐标
        curP.x = ev.getX();
        curP.y = ev.getY();
 
        if(ev.getAction() == MotionEvent.ACTION_DOWN){ 
            //记录按下时候的坐标
            //切记不可用 downP = curP ，这样在改变curP的时候，downP也会改变
            downP.x = ev.getX();
            downP.y = ev.getY();
            //此句代码是为了通知他的父ViewPager现在进行的是本控件的操作，不要对我的操作进行干扰
            getParent().requestDisallowInterceptTouchEvent(true);
        }
 
        if(ev.getAction() == MotionEvent.ACTION_MOVE){ 
            float distanceX = curP.x - downP.x;
            float distanceY = curP.y - downP.y;
            //接近水平滑动，ViewPager控件捕获手势，水平滚动
            if(Math.abs(distanceX) > Math.abs(distanceY)){ 
                //此句代码是为了通知他的父ViewPager现在进行的是本控件的操作，不要对我的操作进行干扰
                getParent().requestDisallowInterceptTouchEvent(true);
            }else{ 
                //接近垂直滑动，交给父控件处理
                getParent().requestDisallowInterceptTouchEvent(false);
            }
        }
 
        return super.onTouchEvent(ev);
    }
 
    private class XScrollDetector extends GestureDetector.SimpleOnGestureListener{ 
        @Override
        public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) { 
 //            return super.onScroll(e1, e2, distanceX, distanceY);
 
            //接近水平滑动时子控件处理该事件，否则交给父控件处理
            return (Math.abs(distanceX) > Math.abs(distanceY));
        }
    }
 
 }
 * ### ###
 * ### ScrollView里嵌套ScrollView ###
 * 两个相同方向的ScrollView是不能嵌套的,所以尽量避免这种情况; 如果不能避免,则看下面
 目前做的这个只支持两个ScrollView嵌套，两个以上还有待改进，能套两个就已经能满足很多需求了目前为纵向scrollview的支持.直接看代码:
 
 public class InnerScrollView extends ScrollView { 
  
    /** 
     */
    public ScrollView parentScrollView; 
  
    public InnerScrollView(Context context, AttributeSet attrs) { 
        super(context, attrs); 
  
    } 
  
    private int lastScrollDelta = 0; 
  
    public void resume() { 
        overScrollBy(0, -lastScrollDelta, 0, getScrollY(), 0, getScrollRange(), 0, 0, true); 
        lastScrollDelta = 0; 
    } 
  
    int mTop = 10; 
  
    /** 
     * 将targetView滚到最顶端 
     */
    public void scrollTo(View targetView) { 
  
        int oldScrollY = getScrollY(); 
        int top = targetView.getTop() - mTop; 
        int delatY = top - oldScrollY; 
        lastScrollDelta = delatY; 
        overScrollBy(0, delatY, 0, getScrollY(), 0, getScrollRange(), 0, 0, true); 
    } 
  
    private int getScrollRange() { 
        int scrollRange = 0; 
        if (getChildCount() > 0) { 
            View child = getChildAt(0); 
            scrollRange = Math.max(0, child.getHeight() - (getHeight())); 
        } 
        return scrollRange; 
    } 
  
    int currentY; 
  
    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) { 
        if (parentScrollView == null) { 
            return super.onInterceptTouchEvent(ev); 
        } else { 
            if (ev.getAction() == MotionEvent.ACTION_DOWN) { 
                // 将父scrollview的滚动事件拦截 
                currentY = (int)ev.getY(); 
                setParentScrollAble(false); 
                return super.onInterceptTouchEvent(ev); 
            } else if (ev.getAction() == MotionEvent.ACTION_UP) { 
                // 把滚动事件恢复给父Scrollview 
                setParentScrollAble(true); 
            } else if (ev.getAction() == MotionEvent.ACTION_MOVE) { 
            } 
        } 
        return super.onInterceptTouchEvent(ev); 
  
    } 
  
    @Override
    public boolean onTouchEvent(MotionEvent ev) { 
        View child = getChildAt(0); 
        if (parentScrollView != null) { 
            if (ev.getAction() == MotionEvent.ACTION_MOVE) { 
                int height = child.getMeasuredHeight(); 
                height = height - getMeasuredHeight(); 
  
                // System.out.println("height=" + height); 
                int scrollY = getScrollY(); 
                // System.out.println("scrollY" + scrollY); 
                int y = (int)ev.getY(); 
  
                // 手指向下滑动 
                if (currentY < y) { 
                    if (scrollY <= 0) { 
                        // 如果向下滑动到头，就把滚动交给父Scrollview 
                        setParentScrollAble(true); 
                        return false; 
                    } else { 
                        setParentScrollAble(false); 
  
                    } 
                } else if (currentY > y) { 
                    if (scrollY >= height) { 
                        // 如果向上滑动到头，就把滚动交给父Scrollview 
                        setParentScrollAble(true); 
                        return false; 
                    } else { 
                        setParentScrollAble(false); 
  
                    } 
  
                } 
                currentY = y; 
            } 
        } 
  
        return super.onTouchEvent(ev); 
    } 
  
    /** 
     * 是否把滚动事件交给父scrollview 
     *  
     * @param flag 
     */
    private void setParentScrollAble(boolean flag) { 
  
        parentScrollView.requestDisallowInterceptTouchEvent(!flag); 
    } 
  
 }
 * ## RecyclerView嵌套滚动问题 ##
 
 <table style="margin:0.667rem 0px; border-collapse:collapse; border:1px solid rgb(187,187,187)"> 
 <tbody> 
 <tr> 
 <td style="border-collapse:collapse; border:1px solid rgb(187,187,187); word-break:break-all"> &nbsp; 在 Android 应用中，大部分情况下都会使用一个垂直滚动的 View 来显示内容（比如 ListView、RecyclerView 等）。但是有时候你还希望垂直滚动的View 里面的内容可以水平滚动。如果直接在垂直滚动的 View 里面使用水平滚动的 View，则滚动操作并不是很流畅。 比如下图中的示例： <img src="http://static.open-open.com/lib/uploadImg/20160920/20160920142205_482.gif" alt="" style="border:0px; max-width:100%; height:auto!important; vertical-align:middle"> <h3 style="margin:10px 0px; padding:0px; font-weight:500; font-size:1.5em; font-family:&quot;Microsoft YaHei&quot;,Verdana,sans-serif,SimSun; line-height:43.2px; color:rgb(64,64,64)"> 为什么会出现这个问题呢？</h3> 上图中的布局为一个 RecyclerView 使用的是垂直滚动的 LinearLayoutManager 布局管理器，而里面每个 Item 为另外一个 RecyclerView 使用的是水平滚动的 LinearLayoutManager。而在&nbsp;<a href="https://www.youtube.com/watch?v=EZAoJU-nUyI" style="color:rgb(0,95,169); font-family:&quot;Helvetica Neue&quot;" rel="nofollow">Android系统的事件分发</a>&nbsp;中，即使最上层的 View 只能垂直滚动，当用户水平拖动的时候，最上层的 View 依然会拦截点击事件。下面是 RecyclerView.java 中 onInterceptTouchEvent 的相关代码： <pre style="margin-top:0px; margin-bottom:10px; background-color:rgb(246,246,246); border:none; font-size:13.6px; line-height:1.45; overflow:auto; padding:6px; word-wrap:break-word; font-family:Menlo,Monaco,Consolas,&quot;Courier New&quot;,monospace; color:rgb(51,51,51); word-break:break-all"><code style="margin:5px; padding:0.5em; border:none; background-color:rgb(255,255,255); white-space:pre-wrap; font-family:Menlo,Monaco,Consolas,'Courier New',monospace; word-wrap:break-word; max-width:100%; display:block; color:black; font-size:undefined; overflow-x:auto">@Override public boolean onInterceptTouchEvent(MotionEvent e) {&nbsp;&nbsp; &nbsp;&nbsp;... &nbsp; &nbsp;&nbsp;switch (action) { &nbsp;&nbsp;&nbsp;&nbsp;case MotionEvent.ACTION_DOWN: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;... &nbsp; &nbsp;&nbsp;&nbsp;&nbsp;case MotionEvent.ACTION_MOVE: { &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;... &nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if (mScrollState != SCROLL_STATE_DRAGGING) { &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;boolean startScroll = false; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if (canScrollHorizontally &amp;&amp; Math.abs(dx) &gt; mTouchSlop) { &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;... &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;startScroll = true; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;} &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if (canScrollVertically &amp;&amp; Math.abs(dy) &gt; mTouchSlop) { &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;... &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;startScroll = true; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;} &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if (startScroll) { &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;setScrollState(SCROLL_STATE_DRAGGING); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;} &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;} &nbsp;&nbsp;&nbsp;&nbsp;} break; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;... &nbsp; &nbsp;&nbsp;} &nbsp;&nbsp;return mScrollState == SCROLL_STATE_DRAGGING; } &nbsp;</code></pre> 注意上面的 if 判断： <pre style="margin-top:0px; margin-bottom:10px; background-color:rgb(246,246,246); border:none; font-size:13.6px; line-height:1.45; overflow:auto; padding:6px; word-wrap:break-word; font-family:Menlo,Monaco,Consolas,&quot;Courier New&quot;,monospace; color:rgb(51,51,51); word-break:break-all"><code style="margin:5px; padding:0.5em; border:none; background-color:rgb(255,255,255); white-space:pre-wrap; font-family:Menlo,Monaco,Consolas,'Courier New',monospace; word-wrap:break-word; max-width:100%; display:block; color:black; font-size:undefined; overflow-x:auto">if(canScrollVertically &amp;&amp; Math.abs(dy) &gt; mTouchSlop) {...}&nbsp;&nbsp; &nbsp; </code></pre> RecyclerView 并没有判断用户拖动的角度， 只是用来判断拖动的距离是否大于滚动的最小尺寸。 如果是一个只能垂直滚动的 View，这样实现是没有问题的。如果我们在里面再放一个 水平滚动的 RecyclerView ，则就出现问题了。 可以通过如下的方式来修复该问题： <pre style="margin-top:0px; margin-bottom:10px; background-color:rgb(246,246,246); border:none; font-size:13.6px; line-height:1.45; overflow:auto; padding:6px; word-wrap:break-word; font-family:Menlo,Monaco,Consolas,&quot;Courier New&quot;,monospace; color:rgb(51,51,51); word-break:break-all"><code style="margin:5px; padding:0.5em; border:none; background-color:rgb(255,255,255); white-space:pre-wrap; font-family:Menlo,Monaco,Consolas,'Courier New',monospace; word-wrap:break-word; max-width:100%; display:block; color:black; font-size:undefined; overflow-x:auto">if(canScrollVertically &amp;&amp; Math.abs(dy) &gt; mTouchSlop &amp;&amp; (canScrollHorizontally || Math.abs(dy) &gt; Math.abs(dx))) {...}&nbsp;&nbsp; &nbsp;</code></pre> 下面是一个完整的实现&nbsp;<a href="https://gist.github.com/manidesto/ecccd38787fa8e287a3f18bcd9867189" style="color:rgb(0,95,169); font-family:&quot;Helvetica Neue&quot;" rel="nofollow">BetterRecyclerView.java</a>&nbsp;： <pre style="margin-top:0px; margin-bottom:10px; background-color:rgb(246,246,246); border:none; font-size:13.6px; line-height:1.45; overflow:auto; padding:6px; word-wrap:break-word; font-family:Menlo,Monaco,Consolas,&quot;Courier New&quot;,monospace; color:rgb(51,51,51); word-break:break-all"><code style="margin:5px; padding:0.5em; border:none; background-color:rgb(255,255,255); white-space:pre-wrap; font-family:Menlo,Monaco,Consolas,'Courier New',monospace; word-wrap:break-word; max-width:100%; display:block; color:black; font-size:undefined; overflow-x:auto">public class BetterRecyclerView extends RecyclerView{ &nbsp;&nbsp;private static final int INVALID_POINTER = -1; &nbsp;&nbsp;private int mScrollPointerId = INVALID_POINTER; &nbsp;&nbsp;private int mInitialTouchX, mInitialTouchY; &nbsp;&nbsp;private int mTouchSlop; &nbsp;&nbsp;public BetterRecyclerView(Contextcontext) { &nbsp;&nbsp;&nbsp;&nbsp;this(context, null); &nbsp;&nbsp;} &nbsp; &nbsp;&nbsp;public BetterRecyclerView(Contextcontext, @Nullable AttributeSetattrs) { &nbsp;&nbsp;&nbsp;&nbsp;this(context, attrs, 0); &nbsp;&nbsp;} &nbsp; &nbsp;&nbsp;public BetterRecyclerView(Contextcontext, @Nullable AttributeSetattrs, int defStyle) { &nbsp;&nbsp;&nbsp;&nbsp;super(context, attrs, defStyle); &nbsp;&nbsp;&nbsp;&nbsp;final ViewConfigurationvc = ViewConfiguration.get(getContext()); &nbsp;&nbsp;&nbsp;&nbsp;mTouchSlop = vc.getScaledTouchSlop(); &nbsp;&nbsp;} &nbsp; &nbsp;&nbsp;@Override &nbsp;&nbsp;public void setScrollingTouchSlop(int slopConstant) { &nbsp;&nbsp;&nbsp;&nbsp;super.setScrollingTouchSlop(slopConstant); &nbsp;&nbsp;&nbsp;&nbsp;final ViewConfigurationvc = ViewConfiguration.get(getContext()); &nbsp;&nbsp;&nbsp;&nbsp;switch (slopConstant) { &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;case TOUCH_SLOP_DEFAULT: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;mTouchSlop = vc.getScaledTouchSlop(); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;break; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;case TOUCH_SLOP_PAGING: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;mTouchSlop = ViewConfigurationCompat.getScaledPagingTouchSlop(vc); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;break; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;default: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;break; &nbsp;&nbsp;&nbsp;&nbsp;} &nbsp;&nbsp;} &nbsp; &nbsp;&nbsp;@Override &nbsp;&nbsp;public boolean onInterceptTouchEvent(MotionEvent e) { &nbsp;&nbsp;&nbsp;&nbsp;final int action = MotionEventCompat.getActionMasked(e); &nbsp;&nbsp;&nbsp;&nbsp;final int actionIndex = MotionEventCompat.getActionIndex(e); &nbsp; &nbsp;&nbsp;&nbsp;&nbsp;switch (action) { &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;case MotionEvent.ACTION_DOWN: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;mScrollPointerId = MotionEventCompat.getPointerId(e, 0); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;mInitialTouchX = (int) (e.getX() + 0.5f); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;mInitialTouchY = (int) (e.getY() + 0.5f); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return super.onInterceptTouchEvent(e); &nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;case MotionEventCompat.ACTION_POINTER_DOWN: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;mScrollPointerId = MotionEventCompat.getPointerId(e, actionIndex); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;mInitialTouchX = (int) (MotionEventCompat.getX(e, actionIndex) + 0.5f); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;mInitialTouchY = (int) (MotionEventCompat.getY(e, actionIndex) + 0.5f); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return super.onInterceptTouchEvent(e); &nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;case MotionEvent.ACTION_MOVE: { &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;final int index = MotionEventCompat.findPointerIndex(e, mScrollPointerId); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if (index &lt; 0) { &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return false; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;} &nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;final int x = (int) (MotionEventCompat.getX(e, index) + 0.5f); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;final int y = (int) (MotionEventCompat.getY(e, index) + 0.5f); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if (getScrollState() != SCROLL_STATE_DRAGGING) { &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;final int dx = x - mInitialTouchX; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;final int dy = y - mInitialTouchY; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;final boolean canScrollHorizontally = getLayoutManager().canScrollHorizontally(); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;final boolean canScrollVertically = getLayoutManager().canScrollVertically(); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;boolean startScroll = false; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if (canScrollHorizontally &amp;&amp; Math.abs(dx) &gt; mTouchSlop &amp;&amp; (Math.abs(dx) &gt;= Math.abs(dy) || canScrollVertically)) { &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;startScroll = true; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;} &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if (canScrollVertically &amp;&amp; Math.abs(dy) &gt; mTouchSlop &amp;&amp; (Math.abs(dy) &gt;= Math.abs(dx) || canScrollHorizontally)) { &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;startScroll = true; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;} &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return startScroll &amp;&amp; super.onInterceptTouchEvent(e); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;} &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return super.onInterceptTouchEvent(e); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;} &nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;default: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return super.onInterceptTouchEvent(e); &nbsp;&nbsp;&nbsp;&nbsp;} &nbsp;&nbsp;} } &nbsp;</code></pre> <h3 style="margin:10px 0px; padding:0px; font-weight:500; font-size:1.5em; font-family:&quot;Microsoft YaHei&quot;,Verdana,sans-serif,SimSun; line-height:43.2px; color:rgb(64,64,64)"> 其他问题</h3> 当用户快速滑动（fling）RecyclerView 的时候， RecyclerView 需要一段时间来确定其最终位置。 如果用户在快速滑动一个子的水平 RecyclerView，在子 RecyclerView 还在滑动的过程中，如果用户垂直滑动，则是无法垂直滑动的。原因是子 RecyclerView 依然处理了这个垂直滑动事件。 <img src="http://static.open-open.com/lib/uploadImg/20160920/20160920142205_977.gif" alt="" style="border:0px; max-width:100%; height:auto!important; vertical-align:middle"> 所以，在快速滑动后的滚动到静止的状态中，子 View 不应该响应滑动事件了，再次看看 RecyclerView 的 onInterceptTouchEvent() 代码： <pre style="margin-top:0px; margin-bottom:10px; background-color:rgb(246,246,246); border:none; font-size:13.6px; line-height:1.45; overflow:auto; padding:6px; word-wrap:break-word; font-family:Menlo,Monaco,Consolas,&quot;Courier New&quot;,monospace; color:rgb(51,51,51); word-break:break-all"><code style="margin:5px; padding:0.5em; border:none; background-color:rgb(255,255,255); white-space:pre-wrap; font-family:Menlo,Monaco,Consolas,'Courier New',monospace; word-wrap:break-word; max-width:100%; display:block; color:black; font-size:undefined; overflow-x:auto">@Override public boolean onInterceptTouchEvent(MotionEvent e) {&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;... &nbsp; &nbsp;&nbsp;&nbsp;&nbsp;switch (action) { &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;case MotionEvent.ACTION_DOWN: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;... &nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if (mScrollState == SCROLL_STATE_SETTLING) { &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;getParent().requestDisallowInterceptTouchEvent(true); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;setScrollState(SCROLL_STATE_DRAGGING); &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;} &nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;... &nbsp;&nbsp;&nbsp;&nbsp;} &nbsp;&nbsp;&nbsp;&nbsp;return mScrollState == SCROLL_STATE_DRAGGING; } &nbsp;</code></pre> 可以看到，当 RecyclerView 的状态为 SCROLL_STATE_SETTLING （快速滑动后到滑动静止之间的状态）时， RecyclerView 告诉父控件不要拦截事件。 同样的，如果只有一个方向固定，这样处理是没问题的。 针对我们这个嵌套的情况，父 RecyclerView 应该只拦截垂直滚动事件，所以可以这么修改父 RecyclerView： <pre style="margin-top:0px; margin-bottom:10px; background-color:rgb(246,246,246); border:none; font-size:13.6px; line-height:1.45; overflow:auto; padding:6px; word-wrap:break-word; font-family:Menlo,Monaco,Consolas,&quot;Courier New&quot;,monospace; color:rgb(51,51,51); word-break:break-all"><code style="margin:5px; padding:0.5em; border:none; background-color:rgb(255,255,255); white-space:pre-wrap; font-family:Menlo,Monaco,Consolas,'Courier New',monospace; word-wrap:break-word; max-width:100%; display:block; color:black; font-size:undefined; overflow-x:auto">public class FeedRootRecyclerView extends BetterRecyclerView{&nbsp;&nbsp; &nbsp;&nbsp;public FeedRootRecyclerView(Contextcontext) { &nbsp;&nbsp;&nbsp;&nbsp;this(context, null); &nbsp;&nbsp;} &nbsp; &nbsp;&nbsp;public FeedRootRecyclerView(Contextcontext, @Nullable AttributeSetattrs) { &nbsp;&nbsp;&nbsp;&nbsp;this(context, attrs, 0); &nbsp;&nbsp;} &nbsp; &nbsp;&nbsp;public FeedRootRecyclerView(Contextcontext, @Nullable AttributeSetattrs, int defStyle) { &nbsp;&nbsp;&nbsp;&nbsp;super(context, attrs, defStyle); &nbsp;&nbsp;} &nbsp; &nbsp;&nbsp;@Override &nbsp;&nbsp;public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { &nbsp;&nbsp;&nbsp;&nbsp;/* do nothing */ &nbsp;&nbsp;} } &nbsp;</code></pre> 下图为最终的结果： <img src="http://static.open-open.com/lib/uploadImg/20160920/20160920142205_251.gif" alt="" style="border:0px; max-width:100%; height:auto!important; vertical-align:middle"> </td> 
 </tr> 
 </tbody> 
 </table>
 * 
 
 * 
 
 * ## recycleview跟scrollview嵌套问题 ##
 
 <table style="margin:0.667rem 0px; border-collapse:collapse; border:1px solid rgb(187,187,187); width:835px"> 
 <tbody> 
 <tr> 
 <td style="border-collapse:collapse; border:1px solid rgb(187,187,187); word-break:break-all"> scrollview 嵌套recyclerview 时，recyclerview不显示，这就需要我们自己计算recyclerview的高度，比如： <pre style="margin-top:0.667rem; margin-bottom:0.667rem; background-color:rgb(247,247,249); border:1px solid rgb(225,225,232); font-size:13px; line-height:19px; overflow:auto; padding:10px; word-wrap:break-word; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace">
 
 
 <ol style="margin:0px; padding-left:2.13rem; color:rgb(30,52,123)">
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%">ViewGroup.LayoutParams mParams = recyclerView.getLayoutParams(); &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; mParams.height = (CommonUtils.getScreenWidthPX(getActivity()) * 480 / 720 + CommonUtils.dipToPixels(40)) * num + CommonUtils.dipToPixels(8); &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; mParams.width = CommonUtils.getScreenWidthPX(getActivity()); &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; recyclerView.setLayoutParams(mParams); &nbsp;</code></li>
 
 </ol></pre> 这中方法适合item高度比较好计算的情形，但要遇到里面的item高度不一定这就需要我们重写recyclerview的高度了，以前嵌套listview的时候我们只需重写listview 然后重写 <pre style="margin-top:0.667rem; margin-bottom:0.667rem; background-color:rgb(247,247,249); border:1px solid rgb(225,225,232); font-size:13px; line-height:19px; overflow:auto; padding:10px; word-wrap:break-word; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace">
 
 
 <ol style="margin:0px; padding-left:2.13rem; color:rgb(30,52,123)">
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%">@Override &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp;protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp;// TODO Auto-generated method stub &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp;int expandSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE &gt;&gt; 2, &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;MeasureSpec.AT_MOST); &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp;super.onMeasure(widthMeasureSpec, expandSpec); &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp;} &nbsp;</code></li>
 
 </ol></pre> 但是这种方法在recyclerview重写不管用。&nbsp; 我们此时要重写的的是LinearLayoutManager或GridLayoutManager <pre style="margin-top:0.667rem; margin-bottom:0.667rem; background-color:rgb(247,247,249); border:1px solid rgb(225,225,232); font-size:13px; line-height:19px; overflow:auto; padding:10px; word-wrap:break-word; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace">
 
 
 <ol style="margin:0px; padding-left:2.13rem; color:rgb(30,52,123)">
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%">public class FullyLinearLayoutManager extends LinearLayoutManager { &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp;private static final String TAG = FullyLinearLayoutManager.class.getSimpleName(); &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp;public FullyLinearLayoutManager(Context context) { &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp;super(context); &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp;} &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp;public FullyLinearLayoutManager(Context context, int orientation, boolean reverseLayout) { &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp;super(context, orientation, reverseLayout); &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp;} &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp;private int[] mMeasuredDimension = new int[2]; &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp;@Override &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp;public void onMeasure(RecyclerView.Recycler recycler, RecyclerView.State state, &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;int widthSpec, int heightSpec) { &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp;final int widthMode = View.MeasureSpec.getMode(widthSpec); &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp;final int heightMode = View.MeasureSpec.getMode(heightSpec); &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp;final int widthSize = View.MeasureSpec.getSize(widthSpec); &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp;final int heightSize = View.MeasureSpec.getSize(heightSpec); &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp;Log.i(TAG, "onMeasure called. \nwidthMode " + widthMode &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;+ " \nheightMode " + heightSpec &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;+ " \nwidthSize " + widthSize &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;+ " \nheightSize " + heightSize &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;+ " \ngetItemCount() " + getItemCount()); &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp;int width = 0; &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp;int height = 0; &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp;for (int i = 0; i &lt; getItemCount(); i++) { &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;measureScrapChild(recycler, i, &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;View.MeasureSpec.makeMeasureSpec(i, View.MeasureSpec.UNSPECIFIED), &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;View.MeasureSpec.makeMeasureSpec(i, View.MeasureSpec.UNSPECIFIED), &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;mMeasuredDimension); &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;if (getOrientation() == HORIZONTAL) { &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;width = width + mMeasuredDimension[0]; &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;if (i == 0) { &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;height = mMeasuredDimension[1]; &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;} &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;} else { &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;height = height + mMeasuredDimension[1]; &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;if (i == 0) { &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;width = mMeasuredDimension[0]; &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;} &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;} &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp;} &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp;switch (widthMode) { &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;case View.MeasureSpec.EXACTLY: &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;width = widthSize; &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;case View.MeasureSpec.AT_MOST: &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;case View.MeasureSpec.UNSPECIFIED: &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp;} &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp;switch (heightMode) { &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;case View.MeasureSpec.EXACTLY: &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;height = heightSize; &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;case View.MeasureSpec.AT_MOST: &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;case View.MeasureSpec.UNSPECIFIED: &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp;} &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp;setMeasuredDimension(width, height); &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp;} &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp;private void measureScrapChild(RecyclerView.Recycler recycler, int position, int widthSpec, &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; int heightSpec, int[] measuredDimension) { &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp;try { &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;View view = recycler.getViewForPosition(0);//fix 动态添加时报IndexOutOfBoundsException &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;if (view != null) { &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;RecyclerView.LayoutParams p = (RecyclerView.LayoutParams) view.getLayoutParams(); &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;int childWidthSpec = ViewGroup.getChildMeasureSpec(widthSpec, &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;getPaddingLeft() + getPaddingRight(), p.width); &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;int childHeightSpec = ViewGroup.getChildMeasureSpec(heightSpec, &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;getPaddingTop() + getPaddingBottom(), p.height); &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;view.measure(childWidthSpec, childHeightSpec); &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;measuredDimension[0] = view.getMeasuredWidth() + p.leftMargin + p.rightMargin; &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;measuredDimension[1] = view.getMeasuredHeight() + p.bottomMargin + p.topMargin; &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;recycler.recycleView(view); &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;} &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp;} catch (Exception e) { &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;e.printStackTrace(); &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp;} finally { &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp;} &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp;} &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%">} &nbsp;</code></li>
 
 </ol></pre> <pre style="margin-top:0.667rem; margin-bottom:0.667rem; background-color:rgb(247,247,249); border:1px solid rgb(225,225,232); font-size:13px; line-height:19px; overflow:auto; padding:10px; word-wrap:break-word; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace">
 
 
 <ol style="margin:0px; padding-left:2.13rem; color:rgb(30,52,123)">
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%">public class FullyGridLayoutManager extends GridLayoutManager { &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp;private int mwidth = 0; &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp;private int mheight = 0; &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp;public FullyGridLayoutManager(Context context, int spanCount) { &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp;super(context, spanCount); &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp;} &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp;public FullyGridLayoutManager(Context context, int spanCount, int orientation, boolean reverseLayout) { &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp;super(context, spanCount, orientation, reverseLayout); &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp;} &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp;private int[] mMeasuredDimension = new int[2]; &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp;public int getMwidth() { &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp;return mwidth; &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp;} &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp;public void setMwidth(int mwidth) { &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp;this.mwidth = mwidth; &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp;} &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp;public int getMheight() { &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp;return mheight; &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp;} &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp;public void setMheight(int mheight) { &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp;this.mheight = mheight; &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp;} &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp;@Override &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp;public void onMeasure(RecyclerView.Recycler recycler, RecyclerView.State state, int widthSpec, int heightSpec) { &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp;final int widthMode = View.MeasureSpec.getMode(widthSpec); &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp;final int heightMode = View.MeasureSpec.getMode(heightSpec); &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp;final int widthSize = View.MeasureSpec.getSize(widthSpec); &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp;final int heightSize = View.MeasureSpec.getSize(heightSpec); &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp;int width = 0; &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp;int height = 0; &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp;int count = getItemCount(); &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp;int span = getSpanCount(); &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp;for (int i = 0; i &lt; count; i++) { &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;measureScrapChild(recycler, i, &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;View.MeasureSpec.makeMeasureSpec(i, View.MeasureSpec.UNSPECIFIED), &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;View.MeasureSpec.makeMeasureSpec(i, View.MeasureSpec.UNSPECIFIED), &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;mMeasuredDimension); &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;if (getOrientation() == HORIZONTAL) { &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;if (i % span == 0) { &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;width = width + mMeasuredDimension[0]; &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;} &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;if (i == 0) { &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;height = mMeasuredDimension[1]; &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;} &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;} else { &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;if (i % span == 0) { &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;height = height + mMeasuredDimension[1]; &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;} &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;if (i == 0) { &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;width = mMeasuredDimension[0]; &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;} &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;} &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp;} &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp;switch (widthMode) { &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;case View.MeasureSpec.EXACTLY: &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;width = widthSize; &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;case View.MeasureSpec.AT_MOST: &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;case View.MeasureSpec.UNSPECIFIED: &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp;} &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp;switch (heightMode) { &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;case View.MeasureSpec.EXACTLY: &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;height = heightSize; &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;case View.MeasureSpec.AT_MOST: &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;case View.MeasureSpec.UNSPECIFIED: &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp;} &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp;setMheight(height); &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp;setMwidth(width); &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp;setMeasuredDimension(width, height); &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp;} &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp;private void measureScrapChild(RecyclerView.Recycler recycler, int position, int widthSpec, &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; int heightSpec, int[] measuredDimension) { &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp;if (position &lt; getItemCount()) { &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;try { &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;View view = recycler.getViewForPosition(0);//fix 动态添加时报IndexOutOfBoundsException &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;if (view != null) { &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;RecyclerView.LayoutParams p = (RecyclerView.LayoutParams) view.getLayoutParams(); &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;int childWidthSpec = ViewGroup.getChildMeasureSpec(widthSpec, &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;getPaddingLeft() + getPaddingRight(), p.width); &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;int childHeightSpec = ViewGroup.getChildMeasureSpec(heightSpec, &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;getPaddingTop() + getPaddingBottom(), p.height); &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;view.measure(childWidthSpec, childHeightSpec); &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;measuredDimension[0] = view.getMeasuredWidth() + p.leftMargin + p.rightMargin; &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;measuredDimension[1] = view.getMeasuredHeight() + p.bottomMargin + p.topMargin; &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;recycler.recycleView(view); &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;} &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;} catch (Exception e) { &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;e.printStackTrace(); &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;} &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp;} &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp;} &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%">} &nbsp;</code></li>
 
 </ol></pre> 重写完之后，用就好说了，在adapter的onBindview和平常一样用就可以了 <pre style="margin-top:0.667rem; margin-bottom:0.667rem; background-color:rgb(247,247,249); border:1px solid rgb(225,225,232); font-size:13px; line-height:19px; overflow:auto; padding:10px; word-wrap:break-word; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace">
 
 
 <ol style="margin:0px; padding-left:2.13rem; color:rgb(30,52,123)">
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%">final FullyGridLayoutManager manager = new FullyGridLayoutManager(context.getActivity(), 3); &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp;manager.setOrientation(GridLayoutManager.VERTICAL); &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp;manager.setSmoothScrollbarEnabled(true); &nbsp;</code></li>
 
 <li style="color:rgb(190,190,197); line-height:18px; padding-left:12px"><code style="margin:0px; padding:0px; border:none; background-color:transparent; font-family:Consolas,&quot;Liberation Mono&quot;,Menlo,Courier,monospace; word-wrap:break-word; max-width:100%"> &nbsp; &nbsp; &nbsp; &nbsp;viewHolder.recyclerView.setLayoutManager(manager); </code></li>
 
 </ol></pre> 或者再activity中设置一样的 此种方法在4.x系统上好用，能显示滑动也流畅，但是在5.x上虽然显示正常，但是滑动的时候好像被粘住了，没有惯性效果。。。。然后郁闷了一下午。。。。&nbsp; 最后解决方法是重写最外层的Scrollview </td> 
 </tr> 
 </tbody> 
 </table>
 * **  
 * 屏蔽 滑动事件  
 * Created by fc on 2015/7/16.  
 */  
 public class MyScrollview extends ScrollView {  
    private int downX;  
    private int downY;  
    private int mTouchSlop;  
  
    public MyScrollview(Context context) {  
        super(context);  
        mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();  
    }  
  
    public MyScrollview(Context context, AttributeSet attrs) {  
        super(context, attrs);  
        mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();  
    }  
  
    public MyScrollview(Context context, AttributeSet attrs, int defStyleAttr) {  
        super(context, attrs, defStyleAttr);  
        mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();  
    }  
  
    @Override  
    public boolean onInterceptTouchEvent(MotionEvent e) {  
        int action = e.getAction();  
        switch (action) {  
            case MotionEvent.ACTION_DOWN:  
                downX = (int) e.getRawX();  
                downY = (int) e.getRawY();  
                break;  
            case MotionEvent.ACTION_MOVE:  
                int moveY = (int) e.getRawY();  
                if (Math.abs(moveY - downY) > mTouchSlop) {  
                    return true;  
                }  
        }  
        return super.onInterceptTouchEvent(e);  
    }  
 }