RatingBar.java 文件源码

/**
 * Returns {@code true} if the target drawable needs to be tileified.
 * <p/>
 * Note: Copied from android.widget.ProgressBar
 *
 * @param dr the drawable to check
 * @return {@code true} if the target drawable needs to be tileified,
 * {@code false} otherwise
 */
private static boolean needsTileify(Drawable dr) {
    if (dr instanceof LayerDrawable) {
        final LayerDrawable orig = (LayerDrawable) dr;
        final int N = orig.getNumberOfLayers();
        for (int i = 0; i < N; i++) {
            if (needsTileify(orig.getDrawable(i))) {
                return true;
            }
        }
        return false;
    }

    // If there's a bitmap that's not wrapped with a ClipDrawable or
    // ScaleDrawable, we'll need to wrap it and apply tiling.
    return dr instanceof BitmapDrawable || dr instanceof VectorDrawable;

}