SelectableRoundedImageView.java 文件源码

public static Drawable fromDrawable(Drawable drawable, Resources r) {
    if (drawable != null) {
        if (drawable instanceof SelectableRoundedCornerDrawable) {
            return drawable;
        } else if (drawable instanceof LayerDrawable) {
            LayerDrawable ld = (LayerDrawable) drawable;
            final int num = ld.getNumberOfLayers();
            for (int i = 0; i < num; i++) {
                Drawable d = ld.getDrawable(i);
                ld.setDrawableByLayerId(ld.getId(i), fromDrawable(d, r));
            }
            return ld;
        }

        Bitmap bm = drawableToBitmap(drawable);
        if (bm != null) {
            return new SelectableRoundedCornerDrawable(bm, r);
        } else {
        }
    }
    return drawable;
}