Android getContext on a background Service

Service extends Context. You can use this, where this is the reference to the Service instance.

Putting more details on my comment below regarding the following code of SubscribeService class:

@Override
public void onCreate() {
    super.onCreate();
    context = this;
    context = MyApp.getContext();
}

In your Service's onCreate() context = this cannot be null by a fundamental programming paradigm.

Try this:

Added super.onCreate(); before MyApp.context = getApplicationContext();

public class MyApp extends Application {

    private static Context context;

    public void onCreate() {
        super.onCreate();
        MyApp.context = getApplicationContext();
    }

    public static Context getAppContext() {
        return MyApp.context;
    }
}

Edit: Calling MyApp.getAppContext() will return the application Context.