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From "Ian Clelland (JIRA)" <>
Subject [jira] [Commented] (CB-6837) Hitting Back button while alert being rendered causes leaked window
Date Thu, 02 Oct 2014 19:00:34 GMT


Ian Clelland commented on CB-6837:

I build a small sample like this:

<a href="index2.html">Page 2</a>

for (var x=0; x < 10; ++x) {
  alert("This is number " + x);

The normal flow is to click "Page 2", and then dismiss all 10 dialogs, and the hit the back
button. That seems to work correctly.

If I instead start hitting the back button while a dialog is displayed, it seems to quickly
overlay the *next* dialog in the sequence, and the next one. Eventually, they're all displayed,
stacked. After that, hitting back dismisses them one at a time, until they're all gone, and
*then* hitting back one more time goes back to page 1.

(This is on the L preview; I'l try it on 4.4 next to see if it's new behaviour)

> Hitting Back button while alert being rendered causes leaked window
> -------------------------------------------------------------------
>                 Key: CB-6837
>                 URL:
>             Project: Apache Cordova
>          Issue Type: Bug
>          Components: Android
>    Affects Versions: 3.5.0
>            Reporter: Marcel Kinard
>            Assignee: Martin Gonzalez
>         Attachments: index.html
> On master and using dialogs plugin. Using a trivial app that has a button to create an
alert dialog after 500ms timeout. If the Back button is hit at approximately the same time
as the timer expires and the alert is to be shown, the following exception appears in logcat:
> D/CordovaWebView( 8178): The current URL is: file:///android_asset/www/index.html
> D/CordovaWebView( 8178): The URL at item 0 is: file:///android_asset/www/index.html
> D/dalvikvm(  513): GC_FOR_ALLOC freed 306K, 13% free 14164K/16240K, paused 54ms, total
> D/CordovaActivity( 8178): Paused the application!
> D/CordovaWebView( 8178): Handle the pause
> W/IInputConnectionWrapper( 8178): showStatusIcon on inactive InputConnection
> W/InputMethodManagerService(  513): Starting input on non-focused client$Stub$Proxy@42396598
(uid=10050 pid=8178)
> D/CordovaActivity( 8178): CordovaActivity.onDestroy()
> D/CordovaWebView( 8178): >>> loadUrlNow()
> E/WindowManager( 8178): 
> E/WindowManager( 8178): android.view.WindowLeaked: Activity com.example.Example has leaked
window$DecorView{41f0d8b8 V.E..... R.....I. 0,0-465,256}
that was originally added here
> E/WindowManager( 8178): 	at android.view.ViewRootImpl.<init>(
> E/WindowManager( 8178): 	at android.view.WindowManagerGlobal.addView(
> E/WindowManager( 8178): 	at android.view.WindowManagerImpl.addView(
> E/WindowManager( 8178): 	at
> E/WindowManager( 8178): 	at$
> E/WindowManager( 8178): 	at org.apache.cordova.CordovaChromeClient.onJsAlert(
> E/WindowManager( 8178): 	at
> E/WindowManager( 8178): 	at
> E/WindowManager( 8178): 	at
> E/WindowManager( 8178): 	at
> E/WindowManager( 8178): 	at android.os.Handler.dispatchMessage(
> E/WindowManager( 8178): 	at android.os.Looper.loop(
> E/WindowManager( 8178): 	at
> E/WindowManager( 8178): 	at java.lang.reflect.Method.invokeNative(Native Method)
> E/WindowManager( 8178): 	at java.lang.reflect.Method.invoke(
> E/WindowManager( 8178): 	at$
> E/WindowManager( 8178): 	at
> E/WindowManager( 8178): 	at dalvik.system.NativeStart.main(Native Method)
> D/CordovaWebViewClient( 8178): onPageFinished(about:blank)
> D/CordovaActivity( 8178): onMessage(onPageFinished,about:blank)
> D/CordovaActivity( 8178): onMessage(exit,null)
> It looks like there is an attempt to show the alert dialog after the activity's onDestroy()
method has been called.
> When resuming the app by clicking on it's icon in the home screen or using the Multitask
button, the webview doesn't render completely, I see only a black screen with the usual status
bar. The app must be killed, and then it works fine after a restart. It appears that there
is a pretty small time window during the timeout in which this can be reproduced, something
on the order of 200ms.

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