Android - embedding Unity3d scene into action - do you need to unregister the receiver?

Question

I was a member of SO for a while, but didn’t really ask a question, so here it goes.

My goal

I am trying to make an android application with two actions. The first is a menu screen (using standard Android interface elements) with a button that opens the gameplay. The activity of the game will have some standard Android and FrameLayout interface elements containing a 3D Unity scene.

I am using Unity 5 and Eclipse Luna.

What i work

I made a menu screen with a simple button to start the second action. I followed this tutorial and managed to get my Unity scene built into my second activity. Everything is fine so far ...

Problem

The first time I start the game process, it works fine (I can see the Unity scene embedded in my FrameLayout), but if I close the activity (to return to the menu activity) and then start the game process again, I get this error ...

Activity has leaked IntentReceiver com.unity3d.player.UnityPlayer$17@41866de0 that was originally registered here. Are you missing a call to unregisterReceiver()? 

What i tried

I searched the Internet many times, and it looks like I need to call something like this in onPause or onDestroy ;

 m_UnityPlayer.currentActivity.unregisterReceiver(receiver); 

... but I don’t know what the receiver is, so I cannot refer to it in my unregisterReceiver call . I tried to create a BroadcastReceiver by registering it and then unregistering it to Pause, but that doesn't make any difference.

I found a message on the Unity forum that asked the same question, but unfortunately it remains unanswered (many questions on the Unity forum unanswered why I came here with this question).

I also tried using this method in onDestroy , but it actually leaves my application when I close activity in the gameplay.

 m_UnityPlayer.quit(); 

Code example

Here is the code for my gaming activity (I removed the import for clarity);

 public class MyEmbeddedUnityActivity extends Activity { private UnityPlayer m_UnityPlayer; IntentFilter filter = new IntentFilter(""); private BroadcastReceiver bRec = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { //String action = intent.getAction(); Log.d("", "onReceive intent: " + intent); } }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_my_embedded_unity); if(m_UnityPlayer==null){ m_UnityPlayer = new UnityPlayer(this); int glesMode = m_UnityPlayer.getSettings().getInt("gles_mode", 1); m_UnityPlayer.init(glesMode, false); m_UnityPlayer.currentActivity.registerReceiver(bRec, filter); FrameLayout layout = (FrameLayout) findViewById(R.id.my_frame); LayoutParams lp = new LayoutParams(200, 300); layout.addView(m_UnityPlayer, 0, lp); } } public void onWindowFocusChanged(boolean hasFocus){ super.onWindowFocusChanged(hasFocus); m_UnityPlayer.windowFocusChanged(hasFocus); } @Override public void onDestroy (){ //m_UnityPlayer.quit(); m_UnityPlayer.currentActivity.unregisterReceiver(bRec); super.onDestroy(); } @Override public void onConfigurationChanged(Configuration newConfig){ super.onConfigurationChanged(newConfig); m_UnityPlayer.configurationChanged(newConfig); } @Override protected void onResume() { super.onResume(); m_UnityPlayer.resume(); } @Override protected void onPause() { super.onPause(); m_UnityPlayer.pause(); } } 

And finally ...

The steps I took to implement the Unity scene were written in 2011. The whole process (capturing files from the intermediate area of ​​the Unity project and copying files around, etc.) seems really hacky and undocumented ,

Is there a better way to embed Unity scenes in Android actions with Unity 5? Of course, adding a Unity scene to an existing application is pretty common to try and do this?

Thank you, any help would be greatly appreciated!

Answer 1

So, I did a few more searches and eventually found the answer, right here on SO!

As discussed in this answer , adding this line to the manifest fixes the problem;

 android:process=":UnityKillsMe" 

therefore, the corresponding part of the manifest looks like this:

 ... <application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name=".Studio" android:configChanges="orientation|keyboardHidden|screenSize" android:process=":UnityKillsMe" android:label="@string/title_activity_home" > </activity> ... 

This makes the gameplay run in a separate process. This means that you can call m_UnityPlayer.quit() in the onDestroy method without closing the entire application.

A simple fix, but it is annoying that it seems to be completely undocumented.

Hope this helps someone!