CheckMarkView.java 文件源码

@Override
protected void onSizeChanged(final int w, final int h, int oldw, int oldh) {
    super.onSizeChanged(w, h, oldw, oldh);
    mDrawable.setBounds(0, 0, w, h);
    mBounds.set(0, 0, w, h);

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
        setOutlineProvider(new ViewOutlineProvider() {
            @TargetApi(Build.VERSION_CODES.LOLLIPOP)
            @Override
            public void getOutline(View view, Outline outline) {
                outline.setOval(0, 0, view.getWidth(), view.getHeight());
            }
        });
        setClipToOutline(true);
    }
}