Android: Fix game controller input being ignored

android/app/src/main/java/com/github/stenzek/duckstation/EmulationActivity.java

@@ -182,6 +182,8 @@ public class EmulationActivity extends AppCompatActivity implements SurfaceHolde
 
         mContentView = findViewById(R.id.fullscreen_content);
         mContentView.getHolder().addCallback(this);
+        mContentView.setFocusable(true);
+        mContentView.requestFocus();
 
         // Hook up controller input.
         updateControllers();
@@ -254,6 +256,8 @@ public class EmulationActivity extends AppCompatActivity implements SurfaceHolde
                         View.SYSTEM_UI_FLAG_HIDE_NAVIGATION |
                         View.SYSTEM_UI_FLAG_FULLSCREEN |
                         View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
+        if (mContentView != null)
+            mContentView.requestFocus();
     }
 
     private static final int REQUEST_CODE_SETTINGS = 0;