Getting NoClassDefFoundError: android.os.AsyncTask

Question

This problem has been bothering me for a bit and I cannot find a satisfactory solution.

Many times (not always) in the creation of a specific object on the Android e

Answer 1

I think I have cracked it.

The thread used to load ads in my app would throw an uncaught exception early on which, in a way I don't 100% understand, caused the worker thread to stop responding. When the program tried to create the AsyncTask the class loader was not working.

Moral, take a vacation and come back with fresh eyes.

Answer 2

Try adding a simple constructor in StatisticsProvider and check.

Answer 3

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:

try {
      Class.forName("android.os.AsyncTask");
}
catch(Throwable ignore) {
      // ignored
}

into your Application#onCreate()

If you don't already have a Application class then create a class that extends from android.app.Application and

1. Add the code above into its #onCreate()
2. Add a reference to your application class in the application element of your AndroidManifest.

<application android:icon="@drawable/icon_game_launcher"
             android:label="@string/app_name"
             android:name="au.com.mycompany.myapp.MyApplication">