java.lang.IllegalStateException: FirebaseApp with name [DEFAULT]

Question

I have been getting this issue.. followed the upgrade guide for new firebase sdk...saved the google services json file in app directory.. still the same error as you but for

Answer 1

Extending @Ian Barber's solution, you can try this generic check to skip processing your custom Application.onCreate for all non-main processes. If the additional processes don't belong to you, then you don't want any of your custom to run.

@Override
public void onCreate() {
    super.onCreate();
    if (FirebaseApp.getApps(this).isEmpty()) {
        // No firebase apps; we are in a non-main process
        // skip custom Application.onCreate
        return;
    }
    // Firebase init only in the main process
    FirebaseDatabase.getInstance().setPersistenceEnabled(true);
    // other code
}