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From "ASF subversion and git services (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CB-3766) Introduced bug causes Android stacktrace during cleanup of CordovaWebView
Date Wed, 19 Jun 2013 23:26:22 GMT

    [ https://issues.apache.org/jira/browse/CB-3766?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13688635#comment-13688635
] 

ASF subversion and git services commented on CB-3766:
-----------------------------------------------------

Commit 3a14017729cacf2464c5e78e0a76c2471ffec0fc in branch refs/heads/master from [~amfowler]
[ https://git-wip-us.apache.org/repos/asf?p=cordova-android.git;h=3a14017 ]

CB-3932 Remove baseUrl comment in handleDestroy method made redundant by CB-3766

                
> Introduced bug causes Android stacktrace during cleanup of CordovaWebView
> -------------------------------------------------------------------------
>
>                 Key: CB-3766
>                 URL: https://issues.apache.org/jira/browse/CB-3766
>             Project: Apache Cordova
>          Issue Type: Bug
>          Components: Android
>    Affects Versions: 2.7.0
>            Reporter: Peter
>            Assignee: Joe Bowser
>
> This was already reprted on the PG Forum, where it was confirmed as a Cordova bug.
> https://groups.google.com/forum/?fromgroups#!topic/phonegap/NXRvkE8Euls
> I am using Cordova v2.7.0.
> My Main Android Activity looks like this:
> {code}
> public class MainActivity extends Activity implements CordovaInterface {
> CordovaWebView cwv;
> ...
> //Destruction code is as follows
> @Override
> public void onDestroy() {
>   if (cwv != null) {
>       cwv.handlePause(true);
>       cwv.handleDestroy();
>       cwv.removeAllViews();
>       cwv.destroy();
>       cwv = null;
>   }               
>   super.onDestroy();
> }
> {code}
> After 1st page is rendered, I cause the destroy event by pressing the device BACK button.
> This is always resulting in a stacktrace:
> {code}
> 06-11 00:49:57.446: I/Web Console(823): onPause() called at file:///android_asset/app1/index.html:11
> 06-11 00:49:58.762: W/IInputConnectionWrapper(823): showStatusIcon on inactive InputConnection
> 06-11 00:50:02.222: D/webviewglue(823): nativeDestroy view: 0x2a24bdb0
> 06-11 00:50:22.292: D/AndroidRuntime(823): Shutting down VM
> 06-11 00:50:22.292: W/dalvikvm(823): threadid=1: thread exiting with uncaught exception
(group=0x40a71930)
> 06-11 00:50:22.334: E/AndroidRuntime(823): FATAL EXCEPTION: main
> 06-11 00:50:22.334: E/AndroidRuntime(823): java.lang.NullPointerException
> 06-11 00:50:22.334: E/AndroidRuntime(823):     at android.webkit.WebViewClassic.stopLoading(WebViewClassic.java:2645)
> 06-11 00:50:22.334: E/AndroidRuntime(823):     at android.webkit.WebView.stopLoading(WebView.java:895)
> 06-11 00:50:22.334: E/AndroidRuntime(823):     at org.apache.cordova.CordovaWebView$2.run(CordovaWebView.java:421)
> 06-11 00:50:22.334: E/AndroidRuntime(823):     at android.os.Handler.handleCallback(Handler.java:725)
> 06-11 00:50:22.334: E/AndroidRuntime(823):     at android.os.Handler.dispatchMessage(Handler.java:92)
> 06-11 00:50:22.334: E/AndroidRuntime(823):     at android.os.Looper.loop(Looper.java:137)
> 06-11 00:50:22.334: E/AndroidRuntime(823):     at android.app.ActivityThread.main(ActivityThread.java:5041)
> 06-11 00:50:22.334: E/AndroidRuntime(823):     at java.lang.reflect.Method.invokeNative(Native
Method)
> 06-11 00:50:22.334: E/AndroidRuntime(823):     at java.lang.reflect.Method.invoke(Method.java:511)
> 06-11 00:50:22.334: E/AndroidRuntime(823):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
> 06-11 00:50:22.334: E/AndroidRuntime(823):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
> 06-11 00:50:22.334: E/AndroidRuntime(823):     at dalvik.system.NativeStart.main(Native
Method)
> {code}
> It appears CordovaWebView.handleDestroy() is calling loadUrlIntoView(url) which reinitialises
plugins and spawns a thread to handle potential timeouts.
> My stacktrace seems caused by the timeout thread (in CordovaWebView) thinking that a
timeout has occurred (because the flag loadUrlTimeout does not indicate otherwise)
> ---
> I believe my cleanup code onDestroy() is implemented correctly. If not, then how should
I do it?
> BTW, This same problem did not occur in Cordova v2.4
> More notes:
> * I am suspicious that the problem is introduced by the fix for CB-2458. To deliberately
cause plugin initialization during destruction seems strange.
> * I am suspicious that the removal of baseUrl in CB-2534, means the CB-2458 is maybe
not even needed anymore, so perhaps original code can be re-instated.

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