可换行的单选框

谁践踏了优雅 2022-06-17 01:43 196阅读 0赞

public class RadioGroupEx extends RadioGroup {
        private static final String TAG = "RadioGroupEx";
    
        public RadioGroupEx(Context context) {
            super(context);
        }
    
        public RadioGroupEx(Context context, AttributeSet attrs) {
            super(context, attrs);
        }
    
        @Override
        protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
            int widthSize = MeasureSpec.getSize(widthMeasureSpec);
            int widthMode = MeasureSpec.getMode(widthMeasureSpec);
            int heightSize = MeasureSpec.getSize(heightMeasureSpec);
            int heightMode = MeasureSpec.getMode(heightMeasureSpec);
    
            //调用ViewGroup的方法，测量子view
            measureChildren(widthMeasureSpec, heightMeasureSpec);
    
            //最大的宽
            int maxWidth = 0;
            //累计的高
            int totalHeight = 0;
    
            //当前这一行的累计行宽
            int lineWidth = 0;
            //当前这行的最大行高
            int maxLineHeight = 0;
            //用于记录换行前的行宽和行高
            int oldHeight;
            int oldWidth;
    
            int count = getChildCount();
            //假设 widthMode和heightMode都是AT_MOST
            for (int i = 0; i < count; i++) {
                View child = getChildAt(i);
                MarginLayoutParams params = (MarginLayoutParams) child.getLayoutParams();
                //得到这一行的最高
                oldHeight = maxLineHeight;
                //当前最大宽度
                oldWidth = maxWidth;
    
                int deltaX = child.getMeasuredWidth() + params.leftMargin + params.rightMargin;
                if (lineWidth + deltaX + getPaddingLeft() + getPaddingRight() > widthSize) {
      //如果折行,height增加
                    //和目前最大的宽度比较,得到最宽。不能加上当前的child的宽,所以用的是oldWidth
                    maxWidth = Math.max(lineWidth, oldWidth);
                    //重置宽度
                    lineWidth = deltaX;
                    //累加高度
                    totalHeight += oldHeight;
                    //重置行高,当前这个View，属于下一行，因此当前最大行高为这个child的高度加上margin
                    maxLineHeight = child.getMeasuredHeight() + params.topMargin + params.bottomMargin;
                    Log.v(TAG, "maxHeight:" + totalHeight + "---" + "maxWidth:" + maxWidth);
    
                } else {
                    //不换行，累加宽度
                    lineWidth += deltaX;
                    //不换行，计算行最高
                    int deltaY = child.getMeasuredHeight() + params.topMargin + params.bottomMargin;
                    maxLineHeight = Math.max(maxLineHeight, deltaY);
                }
                if (i == count - 1) {
                    //前面没有加上下一行的搞，如果是最后一行，还要再叠加上最后一行的最高的值
                    totalHeight += maxLineHeight;
                    //计算最后一行和前面的最宽的一行比较
                    maxWidth = Math.max(lineWidth, oldWidth);
                }
            }
    
            //加上当前容器的padding值
            maxWidth += getPaddingLeft() + getPaddingRight();
            totalHeight += getPaddingTop() + getPaddingBottom();
            setMeasuredDimension(widthMode == MeasureSpec.EXACTLY ? widthSize : maxWidth,
                    heightMode == MeasureSpec.EXACTLY ? heightSize : totalHeight);
    
        }
    
        @Override
        protected void onLayout(boolean changed, int l, int t, int r, int b) {
            int count = getChildCount();
            //pre为前面所有的child的相加后的位置
            int preLeft = getPaddingLeft();
            int preTop = getPaddingTop();
            //记录每一行的最高值
            int maxHeight = 0;
            for (int i = 0; i < count; i++) {
                View child = getChildAt(i);
                MarginLayoutParams params = (MarginLayoutParams) child.getLayoutParams();
                //r-l为当前容器的宽度。如果子view的累积宽度大于容器宽度，就换行。
                if (preLeft + params.leftMargin + child.getMeasuredWidth() + params.rightMargin + getPaddingRight() > (r - l)) {
                    //重置
                    preLeft = getPaddingLeft();
                    //要选择child的height最大的作为设置
                    preTop = preTop + maxHeight;
                    maxHeight = getChildAt(i).getMeasuredHeight() + params.topMargin + params.bottomMargin;
                } else { //不换行,计算最大高度
                    maxHeight = Math.max(maxHeight, child.getMeasuredHeight() + params.topMargin + params.bottomMargin);
                }
                //left坐标
                int left = preLeft + params.leftMargin;
                //top坐标
                int top = preTop + params.topMargin;
                int right = left + child.getMeasuredWidth();
                int bottom = top + child.getMeasuredHeight();
                //为子view布局
                child.layout(left, top, right, bottom);
                //计算布局结束后，preLeft的值
                preLeft += params.leftMargin + child.getMeasuredWidth() + params.rightMargin;
    
            }
    
        }
    
    
    }
         <com.example.duohangdanxuankuang.RadioGroupEx
            android:id="@+id/yanse"
            android:layout_width="match_parent"
            android:layout_height="wrap_content">
    
            <RadioButton
                android:id="@+id/y"
                android:layout_width="100dp"
                android:layout_height="wrap_content"
    
                android:text="黄色" />
    
            <RadioButton
                android:id="@+id/b"
                android:layout_width="100dp"
                android:layout_height="wrap_content"
                android:checked="true"
                android:text="蓝色" />
    
            <RadioButton
                android:id="@+id/r"
                android:layout_width="100dp"
                android:layout_height="wrap_content"
                android:text="红色" />
    
            <RadioButton
                android:id="@+id/g"
                android:layout_width="100dp"
                android:layout_height="wrap_content"
                android:text="灰色" />
    
            <RadioButton
                android:id="@+id/w"
                android:layout_width="100dp"
                android:layout_height="wrap_content"
                android:text="白色" />
    
            <RadioButton
                android:id="@+id/bl"
                android:layout_width="100dp"
                android:layout_height="wrap_content"
                android:text="黑色" />
    
    
    </com.example.duohangdanxuankuang.RadioGroupEx> yanse=(RadioGroup)findViewById(R.id.yanse);
    yanse.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(RadioGroup radioGroup, int i) {
            switch (i){
                case R.id.y:
                    Toast.makeText(MainActivity.this,"黄色",Toast.LENGTH_LONG).show();
                    break;
            }
        }
    });