Issue when returning from cordova BarcodeScanner

[felixwahner]

When returning from a "camera view / barcodescanner" an exception is thrown and the devices view freezes. The app still responds to touch events (seen in the inspector) but the view on the device doesn't get updated.

This happens even if NativeTransitions are deactivated before switching the state.

This is the exception:

I/art     (19748): WaitForGcToComplete blocked for 7.470ms for cause HeapTrim
I/Camera2Client( 2980): disconnect(), Camera 0, calling PID: 19748, client PID: 19748, service PID: 2980
I/Camera2ClientBase( 2980): Closed Camera 0. Client was: de.xxx.app.yyy (PID 19748, UID 10100)
I/chromium(19748): [INFO:CONSOLE(15488)] "[native transition] enabling plugin", source: file:///android_asset/www/index.js?6ccf0f925323bc1ba577 (15488)
I/chromium(19748): [INFO:CONSOLE(15488)] "[native transition] disabling ionic transitions", source: file:///android_asset/www/index.js?6ccf0f925323bc1ba577 (15488)
I/chromium(19748): [INFO:CONSOLE(15488)] "[native transition] $stateChangeStart", source: file:///android_asset/www/index.js?6ccf0f925323bc1ba577 (15488)
I/chromium(19748): [INFO:CONSOLE(15488)] "[native transition]", source: file:///android_asset/www/index.js?6ccf0f925323bc1ba577 (15488)
E/AndroidRuntime(19748): FATAL EXCEPTION: main
E/AndroidRuntime(19748): Process: de.xxx.app.yyy, PID: 19748
E/AndroidRuntime(19748): java.lang.NullPointerException: Attempt to invoke virtual method 'int android.graphics.Bitmap.getWidth()' on a null object reference
E/AndroidRuntime(19748):     at com.telerik.plugins.nativepagetransitions.NativePageTransitions$1.run(NativePageTransitions.java:151)
E/AndroidRuntime(19748):     at android.os.Handler.handleCallback(Handler.java:739)
E/AndroidRuntime(19748):     at android.os.Handler.dispatchMessage(Handler.java:95)
E/AndroidRuntime(19748):     at android.os.Looper.loop(Looper.java:135)
E/AndroidRuntime(19748):     at android.app.ActivityThread.main(ActivityThread.java:5538)
E/AndroidRuntime(19748):     at java.lang.reflect.Method.invoke(Native Method)
E/AndroidRuntime(19748):     at java.lang.reflect.Method.invoke(Method.java:372)
E/AndroidRuntime(19748):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:958)
E/AndroidRuntime(19748):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:753)
I/Process (19748): Sending signal. PID: 19748 SIG: 9
I/HwSystemManager( 3402): HoldService:uid:10100 pid:19748 died
I/HwSystemManager( 3402): HoldService:oldVersionKey:10100,19748
I/MediaProcessHandler( 3231): processOp opType: 1, uid: 10100, pid: 19748
W/MediaProcessHandler( 3231): remove target not exist, maybe the UI process: uid: 10100, pid: 19748

[EddyVerbruggen]

Interesting issue - do you have a little app to reproduce this error? Or can you tell me which barcodescanner plugin and which version of this plugin you're using exactly.

[claudiobianco]

We have looked into it a bit more but unfortunately (for us) could not reproduce it with a small example app.

But here are some more infos:

• The app does not freezes but actually crashes (the touch issue described in the first post was something different)
• As a workaround it now does not crash if we deactivate the native transitions before we start the barcodescanner and then activate it again afterwards. It looks a bit awkward though.
• We use fixedPixelsTop > 0. If we set it to 0, it works fine.
• <preference name="CrosswalkAnimatable" value="true" />

Installed plugins:

com.telerik.plugins.nativepagetransitions 0.6.3 "Native Page Transitions"
cordova-plugin-crosswalk-webview 1.6.1 "Crosswalk WebView Engine"
cordova-plugin-fullscreen 1.1.0 "cordova-plugin-fullscreen"
cordova-plugin-splashscreen 3.1.0 "Splashscreen"
cordova-plugin-statusbar 2.1.2 "StatusBar"
cordova-plugin-whitelist 1.2.1 "Whitelist"
ionic-plugin-keyboard 2.0.1 "Keyboard"
phonegap-plugin-barcodescanner 4.1.0 "BarcodeScanner"

[EddyVerbruggen]

Thanks for those details. If the app crashes then you should be able to find the corresponding stacktrace in the Android devicelog. Can you plugin the device in via USB and run adb logcat? Then reproduce the crash and you should see a stacktrace in the console..

[claudiobianco]

Thats how we got the stacktrace in the first post. Do you need a longer extract?

[EddyVerbruggen]

I'm sorry didn't immediately realize you guys were work together on this. Are you able to make a change to NativePageTransitions.java in a local build for a quick test?

[claudiobianco]

Sorry, wasn't clear about that ;).

Sure

[EddyVerbruggen]

That comment "We use fixedPixelsTop > 0. If we set it to 0, it works fine." is interesting. Can you update the plugin from the master repo (or replace the latest NativePageTransitions.java with what you have now) and try again?

[claudiobianco]

Looks good at first glance. Thanks :).

Will test on monday a bit more, and will get back here again.

[EddyVerbruggen]

Sweet, have a good weekend!

[claudiobianco]

Seems to be working. Thanks again :)