Android ListView下拉刷新

短命女 2022-07-20 15:12 247阅读 0赞

ListView的重要性我就不多说了，下拉刷新的功能以前一直用的别人的，这两天参考一些资料自己写了个ListView下拉刷新的控件，自己会写才能掌握在自己手里，以后扩展什么的，修改起来也方便点，有兴趣的可以看下我写的代码，虽然有点乱……  
PS:请原谅一个英语渣的命名

效果图：  
![20160708110522872][]

代码：

RefreshLinearLayout :

package wkk.refresh;
    
    import android.content.Context;
    import android.support.v4.widget.ScrollerCompat;
    import android.util.AttributeSet;
    import android.view.LayoutInflater;
    import android.view.View;
    import android.view.animation.RotateAnimation;
    import android.widget.ImageView;
    import android.widget.LinearLayout;
    import android.widget.TextView;
    
    /**
     * Created by wkk on 2016/7/5.
     */
    public class RefreshLinearLayout extends LinearLayout {
        
    
        private View header;
        private RefreshListView listView;
        private int h;
    
        private ScrollerCompat scrollerCompat;
    
        private boolean isFirst = true;
    
        public RefreshLinearLayout(Context context, AttributeSet attrs) {
            super(context, attrs);
            setOrientation(LinearLayout.VERTICAL);
            scrollerCompat = ScrollerCompat.create(context);
            header = LayoutInflater.from(getContext()).inflate(R.layout.view_refresh_linear_layout_header, null);
            addView(header);
        }
    
        @Override
        protected void onLayout(boolean changed, int l, int t, int r, int b) {
            super.onLayout(changed, l, t, r, b);
            if (isFirst) {
                int childcount = getChildCount();
                for (int i = 0; i < childcount; i++) {
                    View view = getChildAt(i);
                    if (view instanceof RefreshListView) {
                        listView = (RefreshListView) view;
                    }
                }
                h = header.getMeasuredHeight();
                setPaddingTop(-h);
                listView.setRefreshLinearLayout(this);
                imageView = (ImageView) header.findViewById(R.id.image);
                text = (TextView) header.findViewById(R.id.text);
                isFirst = false;
            }
    
        }
    
        private ImageView imageView;
        private TextView text;
    
        /**
         * 设置提示下拉刷新时的状态
         */
        public void setXLSH() {
            text.setText("下拉刷新");
            imageView.clearAnimation();
            RotateAnimation rotateAnimation1 = new RotateAnimation(180, 0,
                    RotateAnimation.RELATIVE_TO_SELF, 0.5f, RotateAnimation.RELATIVE_TO_SELF, 0.5f);
            rotateAnimation1.setDuration(100);
            rotateAnimation1.setFillAfter(true);
            imageView.setAnimation(rotateAnimation1);
        }
    
        /**
         * 设置提示松开刷新时的状态
         */
        public void setSKSX() {
            text.setText("松开刷新");
            imageView.clearAnimation();
            RotateAnimation rotateAnimation = new RotateAnimation(0, 180,
                    RotateAnimation.RELATIVE_TO_SELF, 0.5f, RotateAnimation.RELATIVE_TO_SELF, 0.5f);
            rotateAnimation.setDuration(100);
            rotateAnimation.setFillAfter(true);
            imageView.setAnimation(rotateAnimation);
        }
    
        /**
         * 设置刷新完成时的状态
         */
        public void setzhengchang() {
            text.setText("下拉刷新");
            imageView.clearAnimation();
        }
    
        /**
         * 滑动
         *
         * @param sy 开始的位置
         * @param ey 偏移量
         */
        public void sc(int sy, int ey) {
            scrollerCompat.startScroll(0, sy, 0, ey, 350);
            postInvalidate();
        }
    
    
        @Override
        public void computeScroll() {
            super.computeScroll();
            if (scrollerCompat.computeScrollOffset()) {
                //scrollerCompat.getCurrX() 获取当前x轴的滑动位置
                setPaddingTop(scrollerCompat.getCurrY());
            }
        }
    
    
        public int getH() {
            return h;
        }
    
        /**
         * 设置此线性布局的paddingTop
         *
         * @param paddingTop
         */
        public void setPaddingTop(int paddingTop) {
            setPadding(getPaddingLeft(), paddingTop, getPaddingRight(), getPaddingBottom());
            postInvalidate();
        }
    
    }

RefreshListView :

package wkk.refresh;
    
    import android.content.Context;
    import android.os.Handler;
    import android.os.Message;
    import android.support.v4.widget.ScrollerCompat;
    import android.util.AttributeSet;
    import android.view.LayoutInflater;
    import android.view.MotionEvent;
    import android.view.View;
    import android.view.ViewGroup;
    import android.widget.AbsListView;
    import android.widget.ListView;
    
    /**
     * Created by wkk on 2016/7/5.
     */
    public class RefreshListView extends ListView implements AbsListView.OnScrollListener {
        
        //包裹listview的布局
        private RefreshLinearLayout refreshLinearLayout;
        //当前第一个可见item
        private int firstVisibleItem;
        //listview的头部布局
        private View header;
        //按下时的y轴坐标
        private float yDown;
        //按下时的x轴坐标
        private float xDown;
        //当前刷新状态
        private static int state;
        //正常状态
        private final static int NULL = 0;
        //提示下拉刷新
        private final static int XLSH = 1;
        //提示松开刷新
        private final static int SKSX = 2;
        //刷新中
        private final static int SXZ = 3;
        //当前操作是在x轴上进行还是在y轴上进行
        private static int xy;
        //在x轴上的操作不去处理
        private final static int x = 4;
        //处理在y轴上的操作
        private final static int y = 5;
        //当前移动的y轴距离
        private int nowMoveY;
        //最小移动距离
        private int minMove = 3;
        //父类的headerView高度
        private int h;
        //此ListView头部布局的高度
        private int thisHeaderHeight;
        //用于传递刷新时间的handler
        private Handler handler;
        //传递给外部的message的what
        public static int REFRESH_WHAT = 123;
        private ScrollerCompat scrollerCompat;
        //处理刷新时的操作
        private int SX = -1;
        //移动时x坐标
        private float xEvent;
        //x轴移动距离
        private float x1;
    
        public RefreshListView(Context context, AttributeSet attrs) {
            super(context, attrs);
            //设置滚动监听
            setOnScrollListener(this);
            //屏蔽魅族手机的下拉悬停
            setOverScrollMode(ListView.OVER_SCROLL_NEVER);
            //初始化状态
            state = NULL;
            xy = NULL;
            minMove = dp2px(context, minMove);
            scrollerCompat = ScrollerCompat.create(context);
            //添加并隐藏头部布局
            header = LayoutInflater.from(context).inflate(R.layout.view_refresh_listview_header, null);
            addHeaderView(header, null, false);
            measureView(header);
            thisHeaderHeight = header.getMeasuredHeight();
            setThisHeaderPaddingTop(-thisHeaderHeight);
        }
    
        /**
         * 设置头部布局
         *
         * @param view
         */
        private void measureView(View view) {
            ViewGroup.LayoutParams p = view.getLayoutParams();
            if (p == null) {
                p = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
            }
            int width = ViewGroup.getChildMeasureSpec(0, 0, p.width);
            int height;
            int tempHeight = p.height;
            if (tempHeight > 0) {
                height = MeasureSpec.makeMeasureSpec(tempHeight, MeasureSpec.EXACTLY);
            } else {
                height = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
            }
            view.measure(width, height);
        }
    
    
        @Override
        public boolean onTouchEvent(MotionEvent ev) {
            if (firstVisibleItem != 0) {
                xy = x;
                if (ev.getAction() == MotionEvent.ACTION_UP) xy = NULL;
                return super.onTouchEvent(ev);
            }
    
            switch (ev.getAction()) {
                case MotionEvent.ACTION_DOWN:
                    //回头此处加判断
                    yDown = ev.getRawY();
                    xDown = ev.getRawX();
                    break;
                case MotionEvent.ACTION_MOVE:
                    xEvent = ev.getRawX();
                    x1 = Math.abs(xEvent - xDown);
                    switch (xy) {
                        case NULL:
                            int dy = (int) Math.abs(ev.getRawY() - yDown);
                            if (dy > minMove) {
                                xy = y;
                            } else if (x1 > minMove) {
                                xy = x;
                            }
                            break;
                        case x:
                            super.onTouchEvent(ev);
                            return true;
                        case y:
                            return move_Y(ev);
                    }
                    break;
                case MotionEvent.ACTION_UP:
                    if (xy == y) {
                        boolean rt = up(ev);
                        xy = NULL;
                        return rt;
                    } else
                        xy = NULL;
                    break;
            }
            return super.onTouchEvent(ev);
        }
    
        /**
         * 处理xy为y时的up事件
         *
         * @param ev
         */
        private boolean up(MotionEvent ev) {
            switch (state) {
                case NULL:
                    break;
                case XLSH:
                    //从当前位置 滑动到-h
                    refreshLinearLayout.sc(nowMoveY, h - nowMoveY - h - h);
                    state = NULL;
                    break;
                case SKSX:
                    setThisHeaderPaddingTop(nowMoveY);
                    refreshLinearLayout.setPaddingTop(-h);
                    scrollerCompat.startScroll(0, nowMoveY, 0, -nowMoveY, 350);
                    state = SXZ;
                    if (handler != null) {
                        //提示外部执行刷新
                        Message msg = handler.obtainMessage();
                        msg.what = REFRESH_WHAT;
                        handler.sendMessage(msg);
                    }
                    break;
                case SXZ:
                    if (SX == y) {
                        scrollerCompat.startScroll(0, nowMoveY, 0, -nowMoveY, 350);
                        postInvalidate();
                        ev.setAction(MotionEvent.ACTION_CANCEL);
                        super.onTouchEvent(ev);
                    } else {
                        super.onTouchEvent(ev);
                    }
                    SX = -1;
                    return true;
            }
            return true;
        }
    
        /**
         * 处理xy为y时的move事件
         *
         * @param ev
         * @return
         */
        private boolean move_Y(MotionEvent ev) {
            float yEvent = ev.getRawY();
            nowMoveY = (int) (yEvent - yDown);
            switch (state) {
                case NULL:
                    if (nowMoveY > minMove) {
                        state = XLSH;
                        xy = y;
                    } else {
                        xy = x;
                    }
                    return super.onTouchEvent(ev);
                case XLSH:
                    nowMoveY = nowMoveY / 3 - h;
                    if (nowMoveY <= -h) {
                        state = NULL;
                        nowMoveY = -h;
                    }
                    if (nowMoveY > 0) {
                        state = SKSX;
                        refreshLinearLayout.setSKSX();
                    }
                    refreshLinearLayout.setPaddingTop(nowMoveY);
                    ev.setAction(MotionEvent.ACTION_CANCEL);
                    super.onTouchEvent(ev);
                    return true;
                case SKSX:
                    nowMoveY = nowMoveY / 3 - h;
                    if (nowMoveY < 0) {
                        state = XLSH;
                        refreshLinearLayout.setXLSH();
                    }
                    if (nowMoveY > refreshLinearLayout.getHeight() / 2 - h) {
                        nowMoveY = refreshLinearLayout.getHeight() / 2 - h;
                    }
                    refreshLinearLayout.setPaddingTop(nowMoveY);
                    break;
                case SXZ:
                    if (SX == -1) {
                        xEvent = ev.getRawX();
                        x1 = Math.abs(xEvent - xDown);
                        int dy = (int) (ev.getRawY() - yDown);
                        if (dy > minMove) {
                            SX = y;
                            refreshSX_y(ev);
                        } else if (x1 > minMove) {
                            SX = x;
                            super.onTouchEvent(ev);
                        }
                    } else if (SX == y) {
                        refreshSX_y(ev);
                    } else if (SX == x) {
                        super.onTouchEvent(ev);
                    }
    
                    return true;
            }
            return true;
        }
    
        private void refreshSX_y(MotionEvent ev) {
            nowMoveY = nowMoveY / 3;
            if (nowMoveY < -h) {
                nowMoveY = -h;
            }
            if (nowMoveY > refreshLinearLayout.getHeight() / 2 - h) {
                nowMoveY = refreshLinearLayout.getHeight() / 2 - h;
            }
            setThisHeaderPaddingTop(nowMoveY);
            ev.setAction(MotionEvent.ACTION_CANCEL);
            super.onTouchEvent(ev);
        }
    
    
        public void setRefreshLinearLayout(RefreshLinearLayout refreshLinearLayout) {
            this.refreshLinearLayout = refreshLinearLayout;
            h = refreshLinearLayout.getH();
        }
    
        /**
         * 刷新完成
         */
        public void refreshOver() {
            refreshLinearLayout.setzhengchang();
            scrollerCompat.startScroll(0, 0, 0, -thisHeaderHeight, 350);
            xy = NULL;
            state = NULL;
            SX = -1;
            postInvalidate();
        }
    
        @Override
        public void computeScroll() {
            super.computeScroll();
            if (scrollerCompat.computeScrollOffset()) {
                setThisHeaderPaddingTop(scrollerCompat.getCurrY());
            }
        }
    
        /**
         * 设置listview头部布局的paddingTop
         *
         * @param paddingTop
         */
        public void setThisHeaderPaddingTop(int paddingTop) {
            header.setPadding(header.getPaddingLeft(), paddingTop, header.getPaddingRight(), header.getPaddingBottom());
            postInvalidate();
        }
    
        /**
         * 设置handler以及what
         * 相较于用接口传递 在此时我更喜欢用handler传递
         *
         * @param handler
         * @param what
         */
        public void setRefreshHandler(Handler handler, int what) {
            this.handler = handler;
            REFRESH_WHAT = what;
        }
    
        @Override
        public void onScrollStateChanged(AbsListView view, int scrollState) {
        }
    
        @Override
        public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
            this.firstVisibleItem = firstVisibleItem;
        }
    
        /**
         * 单位转换
         */
        public static int dp2px(Context context, int dp) {
            float scale = context.getResources().getDisplayMetrics().density;
            return (int) (dp * scale + 0.5f);
        }
    }

view\_refresh\_linear\_layout\_header.xml :

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center">
    
        <ImageView
            android:id="@+id/image"
            android:layout_width="wrap_content"
            android:layout_height="45dp"
            android:background="@drawable/xiala" />
    
        <TextView
            android:id="@+id/text"
            android:layout_width="wrap_content"
            android:layout_height="70dp"
            android:layout_marginLeft="15dp"
            android:gravity="center"
            android:text="下拉可刷新" />
    
    </LinearLayout>

view\_refresh\_listview\_header.xml :

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center">
    
        <ProgressBar
            android:layout_width="40dp"
            android:layout_height="45dp" />
    
        <TextView
            android:id="@+id/text"
            android:layout_width="wrap_content"
            android:layout_height="70dp"
            android:layout_marginLeft="10dp"
            android:gravity="center"
            android:text="正在刷新中" />
    </LinearLayout>

使用方法：  
RefreshLinearLayout 中包裹RefreshListView  
设置handle监听刷新  
调用refreshOver()方法结束刷新

Demo下载地址：  
[http://download.csdn.net/detail/w18756901575/9570607][http_download.csdn.net_detail_w18756901575_9570607]

PS：  
你下载的是一个Project而不是module  
这个例子里面忘记在结束刷新的方法中添加一句：  
postInvalidate();  
所以请使用时自行添加

--------------------

2016/9/18  
今天来了兴致，想要去将上拉加载的也写下，将代码给完善下，但是，，发现设置padding的方式貌似写不了上拉加载，设置了paddingbottom，却不会将listview顶上去，也就是滑倒最底部，上拉加载padding的时候，不会将listview的最后一行顶上去

[20160708110522872]: /images/20220720/5b591cb1b1c345e6942395fc55548746.png
[http_download.csdn.net_detail_w18756901575_9570607]: http://download.csdn.net/detail/w18756901575/9570607