CcDrawableUtils.java 文件源码

@TargetApi(Build.VERSION_CODES.KITKAT)
private static void forceStateChangeOnChildren(Drawable drawable) {
    Drawable.ConstantState drawableState = drawable.getConstantState();
    if (drawableState instanceof DrawableContainer.DrawableContainerState) {
        DrawableContainer.DrawableContainerState drawableContainerState =
                (DrawableContainer.DrawableContainerState) drawableState;

        for (int i = 0; i < drawableContainerState.getChildCount(); i++) {
            Drawable child = drawableContainerState.getChild(i);
            forceStateChange(child, true);
        }
    }
}