Handle directory creation failure gracefully.

app/src/main/java/org/love2d/android/GameActivity.java

@@ -135,6 +135,11 @@ public class GameActivity extends SDLActivity {
         super.onPause();
     }
 
+    @Keep
+    public static DisplayMetrics getDisplayMetrics() {
+        return getDisplayDPI();
+    }
+
     @Keep
     public boolean hasEmbeddedGame() {
         AssetManager am = getAssets();