fixed immersive mode when resuming

src/org/love2d/android/GameActivity.java

@@ -80,17 +80,15 @@ public class GameActivity extends SDLActivity {
     }
 
     @Override
-    public void onWindowFocusChanged(boolean hasFocus) {
-      super.onWindowFocusChanged(hasFocus);
-      if (hasFocus) {
-        getWindow().getDecorView().setSystemUiVisibility(
-            View.SYSTEM_UI_FLAG_LAYOUT_STABLE
-            | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
-            | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
-            | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
-            | View.SYSTEM_UI_FLAG_FULLSCREEN
-            | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
-      }
+    public void onResume() {
+      super.onResume();
+      getWindow().getDecorView().setSystemUiVisibility(
+          View.SYSTEM_UI_FLAG_LAYOUT_STABLE
+          | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
+          | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
+          | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
+          | View.SYSTEM_UI_FLAG_FULLSCREEN
+          | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
     }
 
     public static String getGamePath() {