Error In Firebaselistadapter.startlistening()

Hi I've got a problem with my Firebase. When I debug my app i've got error java.lang.NullPointerException: Attempt to invoke virtual method 'void com.firebase.ui.database.Firebas

Solution 1:

You have this:

@OverrideprotectedvoidonStart() {
 super.onStart();
 adapter.startListening();
}

Now onStart() is an activity lifecycle, and here you are starting to listen for values.

The activity life cycle is like this:

onCreate()>onStart()>onResume()

Those three methods are called so your activity appears infront of you. And since you are using adapter inside onStart(), then the initialization of the adapter needs to be in the method before it which is onCreate(). So this adapter = new FirebaseListAdapter<ChatMessage>(options) {...} has to be inside onCreate().