自定义View制作简单的流式布局（搜索历史记录）

public class View3 extends ViewGroup {
    private int hsize;
    private int wsize;
    private int childh;
    private int childw;

    public View3(Context context) {
        super(context);
    }
    public View3(Context context, AttributeSet attrs) {
        super(context, attrs);
    }
    public View3(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);

        measureChildren(widthMeasureSpec, heightMeasureSpec);
        int top = 10;
        int left = 10;
        
        int hmode = MeasureSpec.getMode(heightMeasureSpec);
        hsize = MeasureSpec.getSize(heightMeasureSpec);
        wsize = MeasureSpec.getSize(widthMeasureSpec);

        switch (hmode){
            case MeasureSpec.AT_MOST:
                //循环测量子View的宽高
                for (int i=0;i<getChildCount();i++){
                    childw = getChildAt(i).getMeasuredWidth();
                    childh = getChildAt(i).getMeasuredHeight();
                    //如果左边距+View宽+右边距>View宽
                 if (left + childw+10>wsize){
                     top +=(childh+10);
                     left=10;
                 }
                    left+=(childw+10);
                }
                //累计最后一行
                top +=(childh+10);
                break;
        }
        setMeasuredDimension(wsize,top);
    }
    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
    int left=10;
    int top=10;
        for (int i=0;i<getChildCount();i++){
            childw = getChildAt(i).getMeasuredWidth();
            childh = getChildAt(i).getMeasuredHeight();
            if (left + childw+10>wsize){
                top +=(childh+10);
                left=10;
                getChildAt(i).layout(left,top,left+childw,top+childh);
            }else{
                getChildAt(i).layout(left,top,left+childw,top+childh);
            }
            left+=(childw+10);
        }
    }
    //添加事件点击事件
    @Override
    public boolean onTouchEvent(MotionEvent event) {
        return super.onTouchEvent(event);
    }
}