Android back button crash in first scene

Target Platforms Mobile
1

Hi,

I am developing an Android app in Unity with Eclipse integration. I’ll try to describe it:

It has a “menu” scene. Basically, it’s a screen which prints “Loading” and waits for a parameter from eclipse. Depending on the parameter received, it loads a specific scene. In all other scenes, android back button was ignored by default, so I wrote code to capture the button press and quit application (it works fine). However, I’ve noticed that if I press the backbutton while “Loading” text is on screen (I have around 1-2 seconds to do that), application crashes. Moreover, I’ve noticed this also happens if I press the backbutton while on the default Unity splash screen, when execution hasn’t reached my code.

Does this issue related to this fact posted in changelog?: Android: Back button will quit the application while the first level has not yet been loaded.

Any idea?

Thanks

2

This also happens on all of my apps which are using Unity 4. Have you found an answer?

3

Same problem here. Happens during a level load with LoadLevelAsync at the moment when the framerate drops to 0 when all our scene elements are getting instantiated.

4

Yeah, I’m using just normal LoadLevel and if you press the back button when its almost done loading, it will exit the app. Also exits if you double/triple tap the back button when returning to the app after being brought out to a browser window.

This has been happening ever since unity 4 came out. I’m surprised this problem isnt this getting more attention. Has nobody upgraded to unity 4 or something?

5

I’m having the same issue. If I press back button while loading something (LoadLevel, Resources.Load, etc) it crashes.

This is the log:

D/dalvikvm( 1141): Unregistering JNI method Lcom/unity3d/player/UnityPlayer;.nativeVideoFrameCallback:VILII
D/dalvikvm( 1141): Unregistering JNI method Lcom/unity3d/player/UnityPlayer;.nativeSoftInputClosed:V
D/dalvikvm( 1141): Unregistering JNI method Lcom/unity3d/player/UnityPlayer;.nativeSetTouchDeltaY:VF
D/dalvikvm( 1141): Unregistering JNI method Lcom/unity3d/player/UnityPlayer;.nativeSetInputString:VL
D/dalvikvm( 1141): Unregistering JNI method Lcom/unity3d/player/UnityPlayer;.nativeSetInputCanceled:VZ
D/dalvikvm( 1141): Unregistering JNI method Lcom/unity3d/player/UnityPlayer;.nativeSetExtras:VL
D/dalvikvm( 1141): Unregistering JNI method Lcom/unity3d/player/UnityPlayer;.nativeSetDefaultDisplay:VI
D/dalvikvm( 1141): Unregistering JNI method Lcom/unity3d/player/UnityPlayer;.nativeResume:V
D/dalvikvm( 1141): Unregistering JNI method Lcom/unity3d/player/UnityPlayer;.nativeResize:VIIII
D/dalvikvm( 1141): Unregistering JNI method Lcom/unity3d/player/UnityPlayer;.nativeRequestedAA:I
D/dalvikvm( 1141): Unregistering JNI method Lcom/unity3d/player/UnityPlayer;.nativeRequested32bitDisplayBuffer:Z
D/dalvikvm( 1141): Unregistering JNI method Lcom/unity3d/player/UnityPlayer;.nativeRender:Z
D/dalvikvm( 1141): Unregistering JNI method Lcom/unity3d/player/UnityPlayer;.nativeRecreateGfxState:VL
D/dalvikvm( 1141): Unregistering JNI method Lcom/unity3d/player/UnityPlayer;.nativePause:Z
D/dalvikvm( 1141): Unregistering JNI method Lcom/unity3d/player/UnityPlayer;.nativeKeysPressed:VL
D/dalvikvm( 1141): Unregistering JNI method Lcom/unity3d/player/UnityPlayer;.nativeInjectEvent:ZL
D/dalvikvm( 1141): Unregistering JNI method Lcom/unity3d/player/UnityPlayer;.nativeInitWWW:VL
D/dalvikvm( 1141): Unregistering JNI method Lcom/unity3d/player/UnityPlayer;.nativeFocusChanged:VZ
D/dalvikvm( 1141): Unregistering JNI method Lcom/unity3d/player/UnityPlayer;.nativeFile:VL
D/dalvikvm( 1141): Unregistering JNI method Lcom/unity3d/player/UnityPlayer;.nativeDone:V
D/dalvikvm( 1141): Unregistering JNI method Lcom/unity3d/player/UnityPlayer;.nativeActivityIndicatorStyle:I
D/dalvikvm( 1141): Unregistering JNI method Lcom/unity3d/player/UnityPlayer;.initJni:VL
D/dalvikvm( 1141): Unregistering JNI method Lcom/unity3d/player/UnityPlayer;.UnitySendMessage:VLLL
D/dalvikvm( 1141): Unregistering JNI method Lcom/unity3d/player/UnityPlayer;.nativeSetLocationStatus:VI
D/dalvikvm( 1141): Unregistering JNI method Lcom/unity3d/player/UnityPlayer;.nativeSetLocation:VFFFFDF
D/dalvikvm( 1141): Unregistering JNI method Lcom/unity3d/player/UnityPlayer;.nativeForwardEventsToDalvik:VZ
D/dalvikvm( 1141): Unregistering JNI method Lcom/unity3d/player/UnityPlayer;.nativeDeviceOrientation:VI
D/dalvikvm( 1141): Unregistering JNI method Lorg/fmod/FMODAudioDevice;.fmodUnblockStreaming:I
D/dalvikvm( 1141): Unregistering JNI method Lorg/fmod/FMODAudioDevice;.fmodProcess:IL
D/dalvikvm( 1141): Unregistering JNI method Lorg/fmod/FMODAudioDevice;.fmodInitJni:I
D/dalvikvm( 1141): Unregistering JNI method Lorg/fmod/FMODAudioDevice;.fmodGetInfo:II
D/dalvikvm( 1141): Unregistering JNI method Lorg/fmod/FMODAudioDevice;.fmodBlockStreaming:I
D/dalvikvm( 1141): Unregistering JNI method Lorg/fmod/FMODAudioDevice;.fmodProcessMicData:ILI
D/dalvikvm( 1141): Unregistering JNI method Lcom/unity3d/player/ReflectionHelper;.nativeProxyInvoke:LILL
D/dalvikvm( 1141): Unregistering JNI method Lcom/unity3d/player/ReflectionHelper;.nativeProxyFinalize:VI
I/Process ( 1141): Sending signal. PID: 1141 SIG: 9
I/WindowState(  593): WIN DEATH: Window{425c4850 u0 com.engidia.xxx/com.qualcomm.QCARUnityPlayer.QCARPlayerNativeActivity}
I/ActivityManager(  593): Process com.engidia.xxx (pid 1141) has died.

Anyone knows why application dies?

Thanks.

6

Did you try to disable back button support before you call load level? Does it still happen?
If so I wonder if this happens in Unity 4.2.2

7

It’s still looks like a bug in Unity 4.3.4f1 and disabling button doesnt help

8

To get around this, you call PlayerPrefs.Save(), then force quit the app “Process.GetCurrentProcess().Kill()”.
When doing research for what I thought was a bug in my own code, I ended up finding out the best answer was there is a memory leak in Unity3D that DID NOT exist in Unity 4.1 and thus Androids main activity gets stuck… why Android can’t handle a memory leak correctly is beyond me, but not surprising either.