CcDrawableUtils.java 文件源码

private static void forceStateChangeOnChildrenCompat(Drawable drawable) {
    Drawable.ConstantState drawableState = drawable.getConstantState();
    if (drawableState instanceof DrawableContainer.DrawableContainerState) {
        DrawableContainer.DrawableContainerState drawableContainerState =
                (DrawableContainer.DrawableContainerState) drawableState;

        Drawable[] children = drawableContainerState.getChildren();
        if (children != null) {
            for (Drawable child : children) {
                forceStateChange(child, true);
            }
        }
    }
}