BUG REPORT

[Charlie]

I am receiving this error stack trace in my Android Error Console with
every app using this SDK

java.lang.NullPointerException
at
android.webkit.WebViewDatabase.getCacheTotalSize(WebViewDatabase.java:
735)
at android.webkit.CacheManager.trimCacheIfNeeded(CacheManager.java:
557)
at android.webkit.WebViewWorker.handleMessage(WebViewWorker.java:195)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:123)
at android.os.HandlerThread.run(HandlerThread.java:60)

http://code.google.com/p/android/issues/detail?id=10789

[wes]

I'm not sure there's much we can do within the SDK to combat this, as it's an Android issue.  For now, maybe the advice in comment 26 is best: wrap your ad-calling code in something like this:

WebViewDatabase webViewDB = WebViewDatabase.getInstance(this);
if (webViewDB!=null) {
    // spin up your ad view
}

maybe with a check beforehand to see if the android version is > 2.3 (which would make this check unnecessary, since it should have been fixed in that version).

Cheers,
Wes

[Mark Carter]

Please could you confirm which SDK version this is fixed for.

>= SDK 9

?

[Mark Carter]

I'm using the workaround described by Wes, but have a report from one user that the bug is still happening:

Atrix 4g

SDK Level: 8

MB860

GingerBlur 4.5

[wes]

Well, like the bug report said: it seems to have been fixed in Android 2.3, which is SDK Level 9, which explains why you're still seeing this on an SDK Level 8 device.

-Wes

[Mark Carter]

Hi Wes - thanks for your feedback.

Please reread what I wrote. I am using the workaround but this is not sufficient (for pre-Gingerbread devices). 

[Emax]

I agree with Mark, I have used the same workaround, but it is not sufficient.

I continue to receive NPE report from users using this "patched" version.

By the way in the report it usually associated to a call to WebViewDatabase.getCacheTotalSize()returning the NPE I would like to try to call it directly, but I cannot find this function as a usabel method of webviewdatabase, there is a way to force a call to it? this way I can force the NPE and catch it disabling the ads

[William Ferguson]

A suggested solution posted elsewhere on this forum, is to call
WebView#clearCache before you start loading ads.
This is because WebView doesn't handle it's cache (among lots of other
things) well.
The end result being the NPE you are experiencing.

[Mark Carter]

Is the purpose of calling WebView#clearCache() to detect whether the exception will happen, or will it actually prevent the exception from happening from within the admob code?

[Emax]

Yes, this way it works.

I use it to detect if something goes wrong and disable the ads.

I catch anything and in the case I disable the ads

I received no more report in last 5 days, I hope I have resolved

For anyone interested my approch is the following (I hope I can help someone):

               boolean bError = false;

try {

WebViewDatabase webViewDB = WebViewDatabase.getInstance( this );

if (webViewDB == null)

bError = true;

WebView oww = new WebView( this );

oww.clearCache( true );

} catch( Throwable anyhing ) {

bError = true;

}

try {

if (!bError) {

                               // ... do my stuff for the ads from admob 

}

} catch( Throwable anyhing ) {

bError = true;

[DANGDUT KOPLO NEW PALLAPA]

i have information google bug in admob by google. will i get a reward for that?

Pada hari Senin, 27 Juni 2011 06:43:40 UTC + 7, Mark Carter menulis:

Saya menggunakan solusi yang dijelaskan oleh Wes, tetapi memiliki laporan dari satu pengguna bahwa bug masih terjadi:

Atrix 4g

Tingkat SDK: 8

MB860

GingerBlur 4.5