fix requested changes part 1

app/src/main/java/org/schabi/newpipe/util/ThemeHelper.java

@@ -190,4 +190,16 @@ public class ThemeHelper {
         String defaultTheme = context.getResources().getString(R.string.default_theme_value);
         return PreferenceManager.getDefaultSharedPreferences(context).getString(themeKey, defaultTheme);
     }
+
+    /**
+     * This will get the R.drawable.* resource to which attr is currently pointing to.
+     *
+     * @param attr a R.attribute.* resource value
+     * @param context the context to use
+     * @return a R.drawable.* resource value
+     */
+    public static int getIconByAttr(final int attr, final Context context) {
+        return context.obtainStyledAttributes(new int[] {attr})
+                .getResourceId(0, -1);
+    }
 }