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https://issues.apache.org/jira/browse/CB-3766?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Joe Bowser reopened 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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