How to exit UnityPlayerActivity not to kill whole process?

Dear Unity developers,
I'm trying to implement Unity (UnityPlayerActivity) not as a single activity but as one of several activities within an application.

What I want is to exit from UnityPlayerActivity/UnityPlayer not to kill whole process and be able to run UnityPlayerActivity again.

I tried to:

• override UnityPlayer.kill(), where Process.killProcess(Process.myPid()) resides with empty implementation, or
  
• not to call UnityPlayer.pause(), UnityPlayer.quit() methods, or
  
• not to call some parts of UnityPlayer.quit() method (via reflexion).

It always ended up with:

• process termination (silent, with no exception), or
  
• process termination (with native exception), or
  
• unity running and leaked in memory (with context etc. probably) and process termination on start of second run of UnityPlayerActivity (with native exception).

Reason I don't want to start UnityPlayerActivity in a separate process and kill it is binding to local service.

Does anyone knows how to solve this issue, or killing the process (and communicate with service with AIDL or Broadcasts or ...?) is the only possibility?

Is it a bug?

Thanks for replies
Ales

 

I have no idea what you're trying to do...Android uses a Stack for it's activities. If you want to run an other activity it gets placed onto the stack. Hence why when you hit the back button it just goes to the previous activity in the stack like a normal stack data structure works.

If you want to have an activity that launches the Unity one, all you have to do is override the AndroidManifest.xml and set your custom Activity as the MainLauncher one. From your custom activity you can just do

Code (CSharp):

1.  
2. Intent intent = new Intent(this, UnityPlayerActivity.class);
3. this.startActivity(intent);
4.  

Maybe I'm not understanding your question but this is what I got out of it.

 

Thanks for reply,
I do it this way, but then, when I want to finish UnityPlayerActivity, it crashes in native libs or kill whole app process silently.

If I do it like suggested - call Activity.finish(), call UnityPlayer.pause() in Activity.onPause(), call UnityPlayer.quit() in Activity.onDestroy(), native exception is thrown:

Code (CSharp):

1. Build fingerprint: 'samsung/gt510wifixx/gt510wifi:7.1.1/NMF26X/T550XXU1CQJ6:user/release-keys'
2. pid: 18275, tid: 18728, name: UnityMain  >>> myapp <<<
3. Stack frame #00  pc 00f87924  /data/app/myapp-1/lib/arm/libunity.so: Routine TestAndRemoveObject(Object*, Unity::Type const*, dynamic_array<Object*, 0u>&) at ??:?
4. Stack frame #01  pc 00f87528  /data/app/myapp-1/lib/arm/libunity.so: Routine MemoryProfilerStats::UnregisterObject(Object*) at ??:?
5. Stack frame #02  pc 00735848  /data/app/myapp-1/lib/arm/libunity.so: Routine delete_object_internal_step1(Object*) at ??:?
6. Stack frame #03  pc 007352a0  /data/app/myapp-1/lib/arm/libunity.so: Routine DestroySingleObject(Object*) at ??:?
7. Stack frame #04  pc 005f26f4  /data/app/myapp-1/lib/arm/libunity.so: Routine AndroidVideoMedia<AndroidMediaNDK::Traits>::VideoDecoder::Destroy() at ??:?
8. Stack frame #05  pc 005f5f3c  /data/app/myapp-1/lib/arm/libunity.so: Routine AndroidVideoMedia<AndroidMediaNDK::Traits>::Close(AndroidMediaNDK::Env&) at ??:?
9. Stack frame #06  pc 005efe08  /data/app/myapp-1/lib/arm/libunity.so: Routine AndroidVideoMedia<AndroidMediaNDK::Traits>::Close() at ??:?
10. Stack frame #07  pc 005ee938  /data/app/myapp-1/lib/arm/libunity.so: Routine AndroidVideoMedia<AndroidMediaNDK::Traits>::~AndroidVideoMedia() at ??:?
11. Stack frame #08  pc 005c8484  /data/app/myapp-1/lib/arm/libunity.so: Routine VideoClipPlayback::~VideoClipPlayback() at ??:?
12. Stack frame #09  pc 005c7c00  /data/app/myapp-1/lib/arm/libunity.so: Routine VideoPlaybackMgr::DestructionMgr::DestroyAllPossible() at ??:?
13. Stack frame #10  pc 005c6e44  /data/app/myapp-1/lib/arm/libunity.so: Routine VideoPlaybackMgr::~VideoPlaybackMgr()::PlaybackDestructionLoop::Execute(VideoPlaybackMgr::DestructionMgr*) at ??:?
14. Stack frame #11  pc 005c6da8  /data/app/myapp-1/lib/arm/libunity.so: Routine VideoPlaybackMgr::~VideoPlaybackMgr() at ??:?
15. Stack frame #12  pc 005ba1b8  /data/app/myapp-1/lib/arm/libunity.so: Routine MediaAPI::Playback::Shutdown() at ??:?
16. Stack frame #13  pc 00748f30  /data/app/myapp-1/lib/arm/libunity.so: Routine TypeManager::CleanupAllTypes() at ??:?
17. Stack frame #14  pc 00d98fb4  /data/app/myapp-1/lib/arm/libunity.so: Routine CleanupEngine() at ??:?
18. Stack frame #15  pc 00d98ee0  /data/app/myapp-1/lib/arm/libunity.so: Routine PlayerCleanup(bool) at ??:?
19. Stack frame #16  pc 0061bba0  /data/app/myapp-1/lib/arm/libunity.so: Routine UnityDeinitApplication() at ??:?
20. Stack frame #17  pc 0061ec34  /data/app/myapp-1/lib/arm/libunity.so: Routine nativeDone(_JNIEnv*, _jobject*) at ??:?
21. Stack frame #18  pc 000a3499  /system/lib/libart.so
22. Stack frame #19  pc 000a3499  /system/lib/libart.so
23. Stack frame #20  pc 000a3499  /system/lib/libart.so
24. Stack frame #21  pc 000a3499  /system/lib/libart.so
25. Stack frame #22  pc 000a3499  /system/lib/libart.so
26. Stack frame #23  pc 000a3499  /system/lib/libart.so
27. Stack frame #24  pc 000a3499  /system/lib/libart.so
28. Stack frame #25  pc 000a3499  /system/lib/libart.so
29. Stack frame #26  pc 000a3499  /system/lib/libart.so
30. Stack frame #27  pc 000a3499  /system/lib/libart.so
31. Stack frame #28  pc 000a3499  /system/lib/libart.so
32. Stack frame #29  pc 000a3499  /system/lib/libart.so
33. Stack frame #30  pc 000a3499  /system/lib/libart.so
34. Stack frame #31  pc 000a3499  /system/lib/libart.so
35. Crash dump is completed
36.  

But it crashes with different signals on different threads sometimes:

Code (CSharp):

1. signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 00000000
2. Build fingerprint: 'samsung/gt510wifixx/gt510wifi:7.1.1/NMF26X/T550XXU1CQJ6:user/release-keys'
3. pid: 19510, tid: 20087, name: UnityChoreograp  >>> myapp <<<
4.  

or

Code (CSharp):

1. signal 11 (SIGSEGV), code 2 (SEGV_ACCERR), fault addr 6ec24948
2. Build fingerprint: 'samsung/gt510wifixx/gt510wifi:7.1.1/NMF26X/T550XXU1CQJ6:user/release-keys'
3. pid: 20323, tid: 20828, name: UnityMain  >>> myapp <<<

Currently its build with Mono scripting backend in Unity 2018.2.0f2 and 2018.2.4f1 (both behave the same)

 

Seems like Unity have a bug when the activity gets destroyed as stated in

https://forum.unity.com/threads/crash-sessions-increase-to-4-with-5-4-android-build.428327/

They are having problems with the repro of the bug. If you are able to reproduce it , you can send a bug report.

However, another way will be to use an android plugin into the unity projects that call android native code.

As a suggestion I would try to open a new activity and then clear the android activity stack as a workaround

 

Thanks for reply and link, it seems to be a different issue to me.

 

hi,Have you solved this issue,I have the same problem

 

Hi, we solved this by running unity in separate process (specified in AndroidManifest) and communicate (Android native app service <---> UnityActivity) via sockets. Then simply don't care about crashes when finishing. Still think it's not best (clear) solution, but working one.

BR and marry xmas

 

yeah! i solved with the same method,but it will create much more proess issue, after all, the unity game just a part of my program!so i want to find better method!

Merry Christmas!!

 

Have you found any permanent solution to it?

 

I am facing the same problem, any stable solutions to it?

 

@ashish_unity707 @RJSD3V pls read https://forum.unity.com/threads/how...ot-to-kill-whole-process.546619/#post-4030150.