DayView.java 文件源码

@TargetApi(Build.VERSION_CODES.LOLLIPOP)
    private static Drawable generateRippleDrawable(final int color, Rect bounds) {
        ColorStateList list = ColorStateList.valueOf(color);
        Drawable mask = generateCircleDrawable(Color.WHITE);
        RippleDrawable rippleDrawable = new RippleDrawable(list, null, mask);
//        API 21
        if (Build.VERSION.SDK_INT == Build.VERSION_CODES.LOLLIPOP) {
            rippleDrawable.setBounds(bounds);
        }

//        API 22. Technically harmless to leave on for API 21 and 23, but not worth risking for 23+
        if (Build.VERSION.SDK_INT == Build.VERSION_CODES.LOLLIPOP_MR1) {
            int center = (bounds.left + bounds.right) / 2;
            rippleDrawable.setHotspotBounds(center, bounds.top, center, bounds.bottom);
        }

        return rippleDrawable;
    }