Demo entry 6329380

啊啊

   

Submitted by anonymous on Nov 30, 2016 at 06:36
Language: Java. Code size: 571 Bytes.

private void performTraversals() {
        ......
        //最外层的根视图的widthMeasureSpec和heightMeasureSpec由来
        //lp.width和lp.height在创建ViewGroup实例时等于MATCH_PARENT
        int childWidthMeasureSpec = getRootMeasureSpec(mWidth, lp.width);
        int childHeightMeasureSpec = getRootMeasureSpec(mHeight, lp.height);
        ......
        mView.measure(childWidthMeasureSpec, childHeightMeasureSpec);
        ......
        mView.layout(0, 0, mView.getMeasuredWidth(), mView.getMeasuredHeight());
        ......
        mView.draw(canvas);
        ......
    }

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