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https://issues.apache.org/jira/browse/CB-3766?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Joe Bowser resolved CB-3766.
----------------------------
Resolution: Not A Problem
At first I thought this was a bug, but the more I look at it, this is like
putting on the parking break, then putting your car in drive and then flooring
it! It's going to smell really bad, you'll probably break your parking brake,
and if you smash in a wall, it won't be super obvious that's what you did.
BTW: Our tests are included with CordovaAndroid. We have a test directory for
the native JUnit tests. It includes some interesting examples. I recommend
checking it out if you're going to do CordovaWebView stuff. Also, if you're
finding memory leaks, submit those as bugs, because they ARE bugs.
> 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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