RoundedFrameLayout.java 文件源码

private void initialize() {

        borderPath = new Path();
        oval = new RectF();

        borderPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        borderPaint.setStyle(Paint.Style.STROKE);

        // ViewOutlineProvider does not support clipping customized path
        if (canUseViewOutlineProvider()) {
            ViewOutlineProvider provider = new ViewOutlineProvider() {
                @Override
                public void getOutline(View view, Outline outline) {

                    if (canUseViewOutlineProvider()) {
                        float radius = Math.max(0, cornerRadius);
                        outline.setRoundRect(0, 0, getWidth(), getHeight(), radius);
                    }
                }
            };

            setOutlineProvider(provider);
            setClipToOutline(true);
        }
    }