CircleImageView.java 文件源码

private void initialize() {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
        setOutlineProvider(new ViewOutlineProvider() {
            @RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
            @Override
            public void getOutline(View view, Outline outline) {
                outline.setOval(
                        view.getPaddingLeft(),
                        view.getPaddingTop(),
                        view.getWidth() - view.getPaddingRight(),
                        view.getHeight() - view.getPaddingBottom());
            }
        });
        setClipToOutline(true);
    }
}