[Android] Allow accessing react-native's in-app developer menu (in the emulator)

android/sdk/src/main/java/org/jitsi/meet/sdk/JitsiMeetActivity.java

@@ -23,11 +23,13 @@ import android.os.Bundle;
 import android.provider.Settings;
 import android.support.annotation.Nullable;
 import android.support.v7.app.AppCompatActivity;
+import android.view.KeyEvent;
+
+import com.facebook.react.ReactInstanceManager;
+import com.facebook.react.modules.core.DefaultHardwareBackBtnHandler;
 
 import java.net.URL;
 
-import com.facebook.react.modules.core.DefaultHardwareBackBtnHandler;
-
 /**
  * Base Activity for applications integrating Jitsi Meet at a higher level. It
  * contains all the required wiring between the {@code JKConferenceView} and
@@ -199,6 +201,23 @@ public class JitsiMeetActivity
         JitsiMeetView.onHostDestroy(this);
     }
 
+    // ReactAndroid/src/main/java/com/facebook/react/ReactActivity.java
+    @Override
+    public boolean onKeyUp(int keyCode, KeyEvent event) {
+        ReactInstanceManager reactInstanceManager;
+
+        if (!super.onKeyUp(keyCode, event)
+                && BuildConfig.DEBUG
+                && (reactInstanceManager
+                        = JitsiMeetView.getReactInstanceManager())
+                    != null
+                && keyCode == KeyEvent.KEYCODE_MENU) {
+            reactInstanceManager.showDevOptionsDialog();
+            return true;
+        }
+        return false;
+    }
+
     @Override
     public void onNewIntent(Intent intent) {
         JitsiMeetView.onNewIntent(intent);

android/sdk/src/main/java/org/jitsi/meet/sdk/JitsiMeetView.java

@@ -83,6 +83,11 @@ public class JitsiMeetView extends FrameLayout {
         return null;
     }
 
+    // XXX Strictly internal use only (at the time of this writing)!
+    static ReactInstanceManager getReactInstanceManager() {
+        return reactInstanceManager;
+    }
+
     /**
      * Internal method to initialize the React Native instance manager. We
      * create a single instance in order to load the JavaScript bundle a single