I have an activity using an xml layout where a WebView is embedded. I am
not using the WebView in my activity code at all, all it does is sitting
there in my xml layout.
Now, when I finish the activity, I find that my activity is not being
cleared from memory. (I check via hprof dump). The activity is entirely
cleared though if I remove the WebView from the xml layout.
I already tried a
webView.destroy();
webView = null;
in onDestroy() of my activity, but that doesn't help much.
In my hprof dump, my activity (named 'Browser') has the following
remaining GC roots (after having called destroy() on it):
com.myapp.android.activity.browser.Browser
- mContext of android.webkit.JWebCoreJavaBridge
- sJavaBridge of android.webkit.BrowserFrame [Class]
- mContext of android.webkit.PluginManager
- mInstance of android.webkit.PluginManager [Class]
I found that another developer has experienced similar thing, see the
reply of Filipe Abrantes on:
http://www.curious-creature.org/2008/12/18/avoid-memory-leaks-on-android/ :
"Indeed a very interesting post. Recently I had a very hard time
troubleshooting a memory leak on my Android app. In the end it turned
out that my xml layout included a WebView component that, even if not
used, was preventing the memory from being g-collected after screen
rotations/app restart… is this a bug of the current implementation, or
is there something specific that one needs to do when using WebViews"
Now, unfortunately there has been no reply on the blog or the mailing
list about this question yet. Therefore I am wondering, is that a bug in
the SDK (maybe similar to the MapView bug as reported
http://code.google.com/p/android/issues/detail?id=2181) or how to get
the activity entirely off the memory with a webview embedded?
(I noted a similar thread on the mailing list from last year, but
unfortunately never an answer to it;
http://groups.google.com/group/android-developers/browse_thread/thread/81312866cb21ec76/6d2fb24980aa71a3?lnk=gst&q=webview+xml+memory#6d2fb24980aa71a3)
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