Bug 11922 - AndroidGameView leaks memory
Summary: AndroidGameView leaks memory
Alias: None
Product: Android
Classification: Xamarin
Component: Mono runtime / AOT Compiler ()
Version: 4.4.x
Hardware: PC Windows
: --- normal
Target Milestone: ---
Assignee: dean.ellis
Depends on:
Reported: 2013-04-23 17:14 UTC by randyficker
Modified: 2013-04-26 09:03 UTC (History)
2 users (show)

Is this bug a regression?: ---
Last known good build:

Repro code (3.34 KB, text/plain)
2013-04-23 17:14 UTC, randyficker

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Description randyficker 2013-04-23 17:14:24 UTC
Created attachment 3859 [details]
Repro code

Any activity that contains an AndroidGameView is never collected by the garbage collector.

I have attached a repro project that demonstrates this.  The project contains two activities, Activity1 and Activity2.  Activity1 just contains a button that launches Activity2.  

Activity2 is similar to the OpenGL sample project that ships with Xamarin.Android.  It simply creates an instance of AndroidGameView, however it also includes a button that calls Finish() so that you can close it to get back to Activity1.

The app also starts a new thread which invokes the garbage collector and prints out how much memory is being used every second.  

By repeatedly tapping the two buttons in the app, you can create and destroy Activity2s at will, and watch logcat to see the memory used by the app rise.  It's clear that the Activity2s that are created are never collected by the garbage collector.

This bug is already causing beta testers of my app to run their devices completely out of memory until they start getting OutOfMemoryExceptions.  This is a big problem, and I can't ship my app with this bug.

I'm running Xamarin.Android 4.6.00049.
Comment 1 dean.ellis 2013-04-26 09:03:04 UTC
I replicated the issue using the code provided. With the fix from the other bug raised on this issue (https://bugzilla.xamarin.com/show_bug.cgi?id=11921) and the following code in the second activity.

protected override void OnDestroy()
			if (_gl != null) {
				_gl = null;

This seems to resolve the issue.