Java.lang.classnotfoundexception: Android.os.asynctask Caused By Admob / Google Play Services?

Since November 21, 2014 I am receiving hundreds of crash reports with the stack below. The crash occurs only on API Level 10 devices (the app supports 9+) The very same version of

Solution 1:

OK, looks like it is a problem with one of the versions of Google play Services. See https://code.google.com/p/android/issues/detail?id=81083

Looks like a work around might be to add the following to your Application#onCreate():

package acme.com.myAppName;

import android.app.Application;

publicclassMyApplicationextendsApplication
{
    @OverridepublicvoidonCreate()
    {
        // begin addtry {
            Class.forName("android.os.AsyncTask");
        } catch(Throwable ignore) {
        }
        // end addsuper.onCreate();
    }
}

NB don't forget to configure your Application class in your AndroidManifest.xml (if you haven't already).

<application
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme"
    android:name="acme.com.myAppName.MyApplication" >
...
</application>

Solution 2:

To expand on the answer above, as I didn't know what the Application#onCreate() was and hadn't already implement one in my app. What I did was create a new Class in my app with the following:

package acme.com.myAppName;

import android.app.Application;

publicclassmyApplicationextendsApplication
{
    @OverridepublicvoidonCreate()
    {
        try
        {
            Class.forName("android.os.AsyncTask");
        }
        catch(Throwable ignore){}

        super.onCreate();
    }
}

Then I updated my AndroidManifest.xml file with android:name="acme.com.myAppName.myApplication" to use the myApplication class, like so:

<application
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme"
    android:name="acme.com.myAppName.myApplication" >
...
</application>

Solution 3:

Same problem here, since 23/11 I got about 1500 ClassNotFoundException errors on 2.x clients, with an increasing trend. The app was not updated for months, so I agree on your hypothesis about the google play services ota update

Solution 4:

I surrounded my adview.loadAd(adrequest); with a try catch block and this has solved my issue.

Here is the code snippet :

    try
    {
    adview.loadAd(adRequest);
    }
    catch(java.lang.NoClassDefFoundError ncdfe)
    {
        ncdfe.printStackTrace();
        Log.d("AD ERROR", "ERROR LOADING AD");
    }