null for argument 'pathString'

Question

I am having an error when I perform queries in firebase, my code for query looks like this:

@Override
protected void onCreate(Bundle savedInstanceState) {
           


        

Answer 1

private FirebaseAuth mAuth;
private FirebaseAuth.AuthStateListener mAuthListener;

In the onCreate() method, initialize the FirebaseAuth instance and the AuthStateListener method so you can track whenever the user signs in or out.

mAuth = FirebaseAuth.getInstance();


mAuthListener = new FirebaseAuth.AuthStateListener() {
@Override
public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
    FirebaseUser user = firebaseAuth.getCurrentUser();
    if (user != null) {
        // User is signed in
        Log.d(TAG, "onAuthStateChanged:signed_in:" + user.getUid());
    } else {
        // User is signed out
        Log.d(TAG, "onAuthStateChanged:signed_out");
    }
    // ...
}

};

Attach the listener to your FirebaseAuth instance in the onStart() method and remove it on onStop().

  public void onStart() {
super.onStart();
mAuth.addAuthStateListener(mAuthListener);

}

public void onStop() {
super.onStop();
if (mAuthListener != null) {
    mAuth.removeAuthStateListener(mAuthListener);
}

}

https://firebase.google.com/docs/auth/android/start/?hl=es-419