Label.java 文件源码

@TargetApi(Build.VERSION_CODES.LOLLIPOP)
void onActionUp() {
    if (mUsingStyle) {
        mBackgroundDrawable = getBackground();
    }

    if (mBackgroundDrawable instanceof StateListDrawable) {
        StateListDrawable drawable = (StateListDrawable) mBackgroundDrawable;
        drawable.setState(new int[]{});
    } else if (Util.hasLollipop() && mBackgroundDrawable instanceof RippleDrawable) {
        RippleDrawable ripple = (RippleDrawable) mBackgroundDrawable;
        ripple.setState(new int[]{});
        ripple.setHotspot(getMeasuredWidth() / 2, getMeasuredHeight() / 2);
        ripple.setVisible(true, true);
    }
    setPressed(false);
}