Android: Evothings Viewer craches

[ghost]

Reported on Evothings Gitter channel: https://gitter.im/evothings/evothings

https://gitter.im/evothings/evothings?at=582901e0e462097a30458f60

I am having a problem with my Evothings Viewer on an Android device. It 'crashes' periodically (can find no pattern to this yet) and I have tried uninstalling and reinstalling, forced stop, clearing caches and data, but nothing except resetting my device to factory settings seems to work. The viewer shows a blank screen and then shuts down. This has been happening with the app downloaded from Google Play, rebuilding from source or building a custom one.

https://gitter.im/evothings/evothings?at=582a4a2d65485ebc6796f34f

My app calls the ble plugin, camera, dialogs and cordova-http of the standard ones. My own viewer also includes file, file-transfer, cordova-httpd, social sharing and secure storage. The android version is 5.0.1. The app crashes at start up - it does not even present the "connect" page. I will work on getting the logcat and post.

the device is a Lenovo Tab3 7

From logcat:

E/StrictMode(21320): A resource was acquired at attached stack trace but never released. See java.io.Closeable for information on avoiding resource leaks.
E/StrictMode(21320): java.lang.Throwable: Explicit termination method 'close' not called
E/StrictMode(21320):     at dalvik.system.CloseGuard.open(CloseGuard.java:184)
E/StrictMode(21320):     at java.io.RandomAccessFile.<init>(RandomAccessFile.java:127)
E/StrictMode(21320):     at com.android.webview.chromium.WebViewChromiumFactoryProvider.startChromiumLocked(WebViewChromiumFactoryProvider.java:16107)
E/StrictMode(21320):     at com.android.webview.chromium.WebViewChromiumFactoryProvider.ensureChromiumStartedLocked(WebViewChromiumFactoryProvider.java:333)
E/StrictMode(21320):     at com.android.webview.chromium.WebViewChromiumFactoryProvider.startYourEngines(WebViewChromiumFactoryProvider.java:427)
E/StrictMode(21320):     at com.android.webview.chromium.WebViewChromium.init(WebViewChromium.java:162)
E/StrictMode(21320):     at android.webkit.WebView.<init>(WebView.java:580)
E/StrictMode(21320):     at android.webkit.WebView.<init>(WebView.java:515)
E/StrictMode(21320):     at android.webkit.WebView.<init>(WebView.java:498)
E/StrictMode(21320):     at android.webkit.WebView.<init>(WebView.java:485)
E/StrictMode(21320):     at org.apache.cordova.engine.SystemWebView.<init>(SystemWebView.java:47)
E/StrictMode(21320):     at org.apache.cordova.engine.SystemWebView.<init>(SystemWebView.java:43)
E/StrictMode(21320):     at org.apache.cordova.engine.SystemWebViewEngine.<init>(SystemWebViewEngine.java:75)
E/StrictMode(21320):     at com.evothings.evothingsviewer.MainActivity$EvothingsWebViewEngine.<init>(MainActivity.java:165)
E/StrictMode(21320):     at com.evothings.evothingsviewer.MainActivity.makeWebViewEngine(MainActivity.java:154)
E/StrictMode(21320):     at org.apache.cordova.CordovaActivity.makeWebView(CordovaActivity.java:192)
E/StrictMode(21320):     at org.apache.cordova.CordovaActivity.init(CordovaActivity.java:141)
E/StrictMode(21320):     at com.evothings.evothingsviewer.MainActivity.onCreate(MainActivity.java:71)
E/StrictMode(21320):     at android.app.Activity.performCreate(Activity.java:6041)
E/StrictMode(21320):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1111)
E/StrictMode(21320):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2437)
E/StrictMode(21320):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2564)
E/StrictMode(21320):     at android.app.ActivityThread.access$800(ActivityThread.java:170)
E/StrictMode(21320):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1441)
E/StrictMode(21320):     at android.os.Handler.dispatchMessage(Handler.java:111)
E/StrictMode(21320):     at android.os.Looper.loop(Looper.java:194)
E/StrictMode(21320):     at android.app.ActivityThread.main(ActivityThread.java:5576)
E/StrictMode(21320):     at java.lang.reflect.Method.invoke(Native Method)
E/StrictMode(21320):     at java.lang.reflect.Method.invoke(Method.java:372)
E/StrictMode(21320):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:955)
E/StrictMode(21320):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:750)
W/System.err(21320): StrictMode VmPolicy violation with POLICY_DEATH; shutting down.

[ghost]

Some observations:

The part of logcat shown above indicates that the origin is here:

https://android.googlesource.com/platform/libcore-snapshot/+/ics-mr1/luni/src/main/java/java/io/RandomAccessFile.java#128

The random access file seems to be opened by the WebView code.

The viewer source code in MainActivity.java does not seem to open Closables (except for the caching code, which is currently not used or called to my knowledge).

Could the error be caused by any of the plugins added? Have not seen this error in the "plain" Viewer.

[tmac2470]

As reported on Evothings Gitter channel, this error seems to occur with a custom version of the viewer (including the additional plugins), a viewer built from source project (with no additional plugins) and the one downloaded from the app store. The Viewer will work for a few hours and then crash. Once any version has crashed it will not start up again until the device factory settings have been restored ( with selection to not use a backed up version to restore). The full logcat output is attached.

crash_original_log_15112016_id_removed.txt

[tmac2470]

UPDATE: This error seems to be caused by latest Android System Webview updates on my device. Uninstalling the updates has resulted in the viewer being stable.

[ghost]

@tmac2470 Thanks a lot for reporting! Closing this issue for now. Let me know if to reopen.

[gokr]

I am fairly sure this is a pure Android WebView bug (not Evothings or Cordova related), as reported here:

https://code.google.com/p/android/issues/detail?id=226751

It seems to manifest itself on only on later Android versions and I also found this quote implying that API 25 has changed to fix it:

"I've been having the same issue, and it looks like it's a bug in API < 25. Try your program in an emulator with API 25 and see if it works. If it works there, then it is most likely the same problem and you are out of luck until is able to fix the issue."

Currently Cordova-android uses Android API 14-23: https://cordova.apache.org/docs/en/latest/guide/platforms/android/index.html

...so not sure how we can fix this?

[ghost]

One approach to solve the WebView issue could be to use Crosswalk: https://github.com/crosswalk-project/cordova-plugin-crosswalk-webview

[perttikasanenhitseed]

This probably was ie to some old setup of the viewer souce. One that updates did not fix. Using the Studio 2.2 build or creating a new project with cordova seemed to fix this.