[Why Crash?] when pressing “BACK” button on “Cocos2dx Activity” Android

cocos2d-x
#1

Hi there!
Please help me out :tired_face:.

Objective

  • Find out the cause of the android app “crash” when pressing “BACK” button on “Cocos2dx Activity”.
  • Find out the cause of the message "I/Process: Sending signal. PID: 30448 SIG: 9"
  • Find out the cause of the message "I/WindowState: WIN DEATH"

Actions

  • If you are interested in trying to reproduce this problem, please take the sample source from GITHUB (linked below)
  • Please let me know any hint about the cause of the problem

Source Codes

You can get the source from here:

Situation

This Android project is created for debugging app crash of cocos2dx activity at pressing BACK button.

This app has a "Hybrid” structure with a standard “Android activity” and a “Cocos2dx activity”.
And users can switch both activities using UI and “BACK” navigation button.

imgSeq01

I released an app which also has the same “Hybrid” structure but app users informed me that my app occasionally crashes when “BACK” button is pressed. Unfortunately, in my development environment, the crash does not happen every time and cannot find out the cause of the problem from debug logs.

That’s why I created this simple project which has only simplified activities with almost no functionality to find out the cause of the crash.

Test Environment

  • Cocos2d-x 3.15.1 or Cocos2d-x 3.16
  • Android Studio 3.0.1
  • Android SDK Build-Tools 27.0.3
  • Android TargetSDK 26
  • Android NDK: 16.1.4479499
  • PROP_APP_ABI: armeabi-v7a:x86
  • PROP_TARGET_SDK_VERSION: 16
  • Ubuntu 16.04 LTS

Project file structure

  • Classes : C++ files for cocos2d-x
  • Resources : images and fonts for cocos2d-x
  • cocos2d : [Optional for cocos2dx 3.15.1] modified files for enabling “BACK” button
  • proj.android-studio : Android project files

How to use

  • Take cocos2d-x 3.15.1 or 3.16
  • Clone this project from GITHUB for Android Studio
  • [Only for cocos2dx 3.15.1] Some Cocos2d-x source files have been modified especially for enabling “BACK” button on cocos2d-x activity. The files are saved under cocos2d/cocos folder. Overwrite those files on your project.
  • Open “proj.android-studio” folder from Android Studio and build it.

LogCat

This log was taken when an app was crashed and just after pressing “BACK” button on “Cocos2dx” activity.
I think the app was crashed around when the following message was shown.

I/Process: Sending signal. PID: 30448 SIG: 9

I/WindowState: WIN DEATH: Window

D/Cocos2dxGLSurfaceView: onKeyDown keyCode=4
D/Cocos2dxGLSurfaceView: onKeyUp keyCode=4
D/cocos2d-x debug info: Exit KeyEscape
D/cocos2d-x debug info: actionFinish start..
D/cocos2d-x debug info: actionFinish done.
D/cocos2d-x debug info: Destructor start..
D/cocos2d-x debug info: Destructor done.
I/Process: Sending signal. PID: 30448 SIG: 9
I/WindowState: WIN DEATH: Window{e23ac3c u0 com.android.app/com.android.app.Activity}
W/WindowManager: Force-removing child win Window{4d9f07d u0 SurfaceView} from container Window{e23ac3c u0 com.android.app/com.android.app.Activity}
D/GraphicsStats: Buffer count: 11
W/WindowManager: Failed looking up window
                    java.lang.IllegalArgumentException: Requested window android.os.BinderProxy@204fe4b does not exist
                                at com.android.server.wm.WindowManagerService.windowForClientLocked(WindowManagerService.java:8743)
                        at com.android.server.wm.WindowManagerService.windowForClientLocked(WindowManagerService.java:8734)
                        at com.android.server.wm.WindowState$DeathRecipient.binderDied(WindowState.java:1209)
                        at android.os.BinderProxy.sendDeathNotice(Binder.java:558)
I/WindowState: WIN DEATH: null
I/WindowState: WIN DEATH: Window{6a5485b u0 com.android.app/com.android.app.MainActivity}
I/ActivityManager: Process com.android.app (pid 30448) has died
D/ActivityManager: cleanUpApplicationRecord -- 30448
W/ActivityManager: Force removing ActivityRecord{9a16ca4 u0 com.android.app/com.android.app.Activity t2649}: app died, no saved state
I/ActivityManager: Start proc 30691:com.android.app/u0a1577 for activity com.android.app/.MainActivity
I/art: Late-enabling -Xcheck:jni
W/art: Failed execv(/system/bin/dex2oat --runtime-arg -classpath --runtime-arg  --debuggable --instruction-set=arm --instruction-set-features=smp,div,atomic_ldrd_strd --runtime-arg -Xrelocate --boot-image=/system/framework/boot.art --runtime-arg -Xms64m --runtime-arg -Xmx512m --instruction-set-variant=krait --instruction-set-features=default --dex-file=/data/app/com.android.app-2/split_lib_slice_9_apk.apk --oat-file=/data/dalvik-cache/arm/data@app@com.android.app-2@split_lib_slice_9_apk.apk@classes.dex) because non-0 exit status
I/InstantRun: starting instant run server: is main process
W/art: Before Android 4.1, method android.graphics.PorterDuffColorFilter android.support.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable
I/art: Background sticky concurrent mark sweep GC freed 23000(1903KB) AllocSpace objects, 4(80KB) LOS objects, 17% free, 19MB/23MB, paused 6.819ms total 19.143ms
I/MaterialDrawer: updateProfileTheme colInv1=de000000 colInv2=8a000000
I/AppCompatViewInflater: app:theme is now deprecated. Please move to using android:theme instead.
I/MaterialDrawer: updateProfileTheme colInv1=de000000 colInv2=8a000000
D/audio_hw_primary: disable_audio_route: reset and update mixer path: low-latency-playback
D/audio_hw_primary: disable_snd_device: snd_device(2: speaker)
I/DrawerProfile: getView
I/DrawerProfile: getView getTheme
I/DrawerProfile: getView colPrimary=ffaaaaaa
I/DrawerProfile: getView highlite=ffaaaaaa
I/DrawerProfile: getView 1 primaryColor=ffaaaaaa
I/DrawerProfile: getView
I/DrawerProfile: getView getTheme
I/DrawerProfile: getView colPrimary=ffaaaaaa
I/DrawerProfile: getView highlite=ffaaaaaa
I/DrawerProfile: getView 1 primaryColor=ffaaaaaa
D/OpenGLRenderer: Use EGL_SWAP_BEHAVIOR_PRESERVED: true
I/Adreno-EGL: <qeglDrvAPI_eglInitialize:379>: QUALCOMM Build: 10/21/15, 369a2ea, I96aee987eb
I/OpenGLRenderer: Initialized EGL, version 1.4
I/MaterialDrawer: updateProfileTheme colInv1=ffaaaaaa colInv2=ffaaaaaa
W/art: Before Android 4.1, method int android.support.v7.widget.ListViewCompat.lookForSelectablePosition(int, boolean) would have incorrectly overridden the package-private method in android.widget.ListView
I/ListPopupWindow: Could not find method setEpicenterBounds(Rect) on PopupWindow. Oh well.
W/InputMethodManagerService: Got RemoteException sending setActive(false) notification to pid 30448 uid 11577
I/ActivityManager: Displayed com.android.app/.MainActivity: +3s656ms
I/GoogleInputMethod: onFinishInput() : Dummy InputConnection bound
I/GoogleInputMethod: onStartInput() : Dummy InputConnection bound
E/libEGL: call to OpenGL ES API with no current context (logged once per thread)
V/RenderScript: 0x9c66c000 Launching thread(s), CPUs 4
V/RenderScript: Successfully loaded runtime: libRSDriver_adreno.so
D/MultiStep: _running
D/MultiStep: collectDataCount = 15
I/AppInsightService: collectData - 16, Run Monitoring:true, WiFi On:true - 
I/CpuDataCollector: CpuMonitor.getCpuUsage - Result 50.0 - 
D/MultiStep: end runnable

Lastly…

Thank you very much for your help! :rofl: