context.getResources().getDrawable(R.mipmap.icon_my);
     官方推薦呼叫 
     context.getResources().getDrawable(R.mipmap.icon_my，theme);

只是過時了，並不影響使用，只是在特殊情況下，在Android4.1系統之前載入縮圖可能會出現異常，所以被谷歌廢棄了。建議用以下方法代替：
ContextCompat.getDrawable(context,R.mipmap.indexz);

public class ContextCompat {
    /**
     * Return a drawable object associated with a particular resource ID.
     * <p>
     * Starting in {@link android.os.Build.VERSION_CODES#LOLLIPOP}, the returned
     * drawable will be styled for the specified Context's theme.
     *
     * @param
 
 id The desired resource identifier, as generated by the aapt tool.
     *            This integer encodes the package, type, and resource entry.
     *            The value 0 is an invalid identifier.
     * @return Drawable An object that can be used to draw this resource.
     */
    public static final
 
 Drawable getDrawable(Context context, int id) {
        final int version = Build.VERSION.SDK_INT;
        if (version >= 21) {
            return ContextCompatApi21.getDrawable(context, id);
        } else {
            return context.getResources().getDrawable(id);
        }
    }
}