Android : EventHub.removeMessages(int what = 107) is not supported before the WebViewCore is set up

Question

I have implemented WebView in Dialog Activity and I am loading simple url into webview.

my Webview settings are as

wbView = (WebView) findViewById(R.id.wbView);
        wbView.setKeepScreenOn(true);
        wbView.getSettings().setJavaScriptEnabled(true);
        wbView.getSettings().setDomStorageEnabled(true);
        wbView.getSettings().setBuiltInZoomControls(true);
        wbView.setInitialScale(100);
        // wbView.getSettings().setUseWideViewPort(true);
        wbView.setScrollBarStyle(View.SCROLLBARS_OUTSIDE_OVERLAY);
        wbView.setWebViewClient(new MyWebViewClient());

and MyWebViewClient() contains

private class MyWebViewClient extends WebViewClient {
        @Override
        public void onPageFinished(WebView view, String url) {
            super.onPageFinished(view, url);
            prgBar.setVisibility(View.GONE);
        }

        @Override
        public void onReceivedSslError(WebView view, SslErrorHandler handler,
                SslError error) {
            Log.e("Error VAGARO", error.toString());
            prgBar.setVisibility(View.GONE);
            handler.proceed();
        }

        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String url) {
            view.loadUrl(url);
            return false;
        }
    }

I am loading two HTML files from the Asset in the same webview its working fine but unable to load dynamic url.

I Google and find some posts on http://code.google.com/p/android/issues/detail?id=21177

My logcat shows me

05-09 13:33:30.187: W/webcore(20054): java.lang.Throwable: EventHub.removeMessages(int what = 107) is not supported before the WebViewCore is set up.
05-09 13:33:30.187: W/webcore(20054):   at android.webkit.WebViewCore$EventHub.removeMessages(WebViewCore.java:1683)
05-09 13:33:30.187: W/webcore(20054):   at android.webkit.WebViewCore$EventHub.access$7900(WebViewCore.java:926)
05-09 13:33:30.187: W/webcore(20054):   at android.webkit.WebViewCore.removeMessages(WebViewCore.java:1795)
05-09 13:33:30.187: W/webcore(20054):   at android.webkit.WebView.sendOurVisibleRect(WebView.java:2917)
05-09 13:33:30.187: W/webcore(20054):   at android.webkit.ZoomManager.setZoomScale(ZoomManager.java:593)
05-09 13:33:30.187: W/webcore(20054):   at android.webkit.ZoomManager.access$1700(ZoomManager.java:49)
05-09 13:33:30.187: W/webcore(20054):   at android.webkit.ZoomManager$PostScale.run(ZoomManager.java:984)
05-09 13:33:30.187: W/webcore(20054):   at android.os.Handler.handleCallback(Handler.java:605)
05-09 13:33:30.187: W/webcore(20054):   at android.os.Handler.dispatchMessage(Handler.java:92)
05-09 13:33:30.187: W/webcore(20054):   at android.os.Looper.loop(Looper.java:137)
05-09 13:33:30.187: W/webcore(20054):   at android.app.ActivityThread.main(ActivityThread.java:4424)
05-09 13:33:30.187: W/webcore(20054):   at java.lang.reflect.Method.invokeNative(Native Method)
05-09 13:33:30.187: W/webcore(20054):   at java.lang.reflect.Method.invoke(Method.java:511)
05-09 13:33:30.187: W/webcore(20054):   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
05-09 13:33:30.187: W/webcore(20054):   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
05-09 13:33:30.187: W/webcore(20054):   at dalvik.system.NativeStart.main(Native Method)

Suggest me the change that I should make.

Update

I found that if I'll pass any url like "www.facebook.com" then its giving me this error, but if I'll replace it with "https://www.facebook.com" then its working fine.

You'll also see this error if you try to load a javascript: url into a nonexistant page. — James Moore, May 14 '12 at 19:18

score 8 · Accepted Answer · edited Feb 08 '13 at 09:44

8

The issue I found was because of the url without http:// or https://. So I appended this tag if the url doesn't contains http:// or https://.

edited Feb 08 '13 at 09:44

answered May 09 '12 at 10:04

Vishal Khakhkhar

2,106
3
29
60

I just had the same issue on a Toshiba AT300 (Android 4.0.3) because of a trailing slash on the URL: http://scratch.mit.edu/projects/editor/ – Rupert Rawnsley May 16 '13 at 09:40
2

I get the same problem. Using `WebView.loadUrl("http:///www.google.com");` works. However, as soon as I try `WebView.loadUrl("file:///android_asset/html5video.html");` it shows the exception. /facepalm – Someone Somewhere Jan 16 '14 at 00:48
@VishalKhakhkhar what about if need to load "HTML" type string ? – krunal shah Jun 08 '15 at 08:38

score 5 · Answer 2 · answered Jul 27 '12 at 10:43

In my case, I fixed it by changing the order. I put the loadUrl before getSettings()

Working snippet below,

mWebView = (WebView) findViewById(R.id.web_view);

// load file
mWebView.loadUrl(SERVER_URL);
mWebView.getSettings().setJavaScriptEnabled(true);

Hope this helps someone..

score 3 · Answer 3 · edited May 23 '17 at 11:53

I've seen this stack sometimes during the last days in my LogCat, but until now it wasn't blocking my dev. But I suspect it's related to the struggling my WebView somtetimes does. It seems to be a Bug affecting not only us:

android.webkit.WebViewCore.removeMessages(int):void

1675        private synchronized void removeMessages(int what) {
1676            if (mBlockMessages) {
1677                return;
1678            }
1679            if (what == EventHub.WEBKIT_DRAW) {
1680                mDrawIsScheduled = false;
1681            }
1682            if (mMessages != null) {
1683                Throwable throwable = new Throwable(
1684                        "EventHub.removeMessages(int what = " + what + ") is not supported " +
1685                        "before the WebViewCore is set up.");
1686                Log.w(LOGTAG, Log.getStackTraceString(throwable));
1687            } else {
1688                mHandler.removeMessages(what);
1689            }
1690        }

The Queue mMessages has to be NULL to avoid the Exception.

// Message queue for containing messages before the WebCore thread is ready.

So it's quite simple: something is causing the WebCore to need much more time to set up. According that 107 is `SET_SCROLL_OFFSET' and the stack-trace shows ZoomManger I will check if something in my code is causing the view to get active in some way while initiating the settings.

ANSWER: This exception will be thrown if you call requestWindowFeature(Window.FEATURE_NO_TITLE) and then wait too long for calling setContentView(). How long you can wait I couldn't figure out. So those two will be the first lines in onCreate() from now. Time will show me if I'm right.

The good news are that this warning tagged webcore is only a warning and itself causes no impact to the rest of the app.

The bad news are that it seems that my problem has nothing to do with it and comes from somewhere other.

score 1 · Answer 4 · answered Jun 10 '12 at 16:27

1

The issue is generally related to the URL being pointed to not being found. It is a 404 (i.e. a URL that wasn't found). Modify the URL

answered Jun 10 '12 at 16:27

kakoma

1,179
13
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score 0 · Answer 5 · answered Apr 09 '13 at 08:23

I have the same problem after I called finish() and restart the same Activity. Therefore, maybe it cannot simply finish the activity with a WebView . I did the following before finish the activity and it works.

try{
        webView.stopLoading();
        ViewGroup parent = (ViewGroup)webView.getParent();
        parent.removeView(webView);
        webView.destroy();
}catch(Exception e){
        Log.e(TAG, "clear webView fail");
        e.printStackTrace();
}
 finish();

Android : EventHub.removeMessages(int what = 107) is not supported before the WebViewCore is set up

5 Answers5

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