No write to database

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Trying to use Firebase Realtime Database. I have :

private FirebaseDatabase mFirebaseDatabase;
private DatabaseReference mMessagesDatabaseReference;

In onCreate of main activity I’m trying to write record:

mFirebaseDatabase = FirebaseDatabase.getInstance();
mMessagesDatabaseReference = mFirebaseDatabase.getReference().child("settings");
mMessagesDatabaseReference.push().setValue("aaaa").addOnCompleteListener(new OnCompleteListener<Void>() {

        @Override
        public void onComplete(@NonNull Task<Void> task) {
            if (task.isSuccessful()) {
                Log.d("TAG", "Data written successfully");
            } else {
                Log.d("TAG", "Failed with: " + task.getException().getMessage());
            }
        }

    }).addOnFailureListener(e -> {
        Log.d("TAG", "Failed with: " + e.getMessage()); });

But still have NULL in the Firebase console in the DB browser.

build.gradle has lines:

implementation(platform("com.google.firebase:firebase-bom:32.7.2"))
implementation("com.google.firebase:firebase-database:20.3.0")

What did I do wrong?

UPD

Changed code by adding onComplete and OnFailure listeners.
None of events are called.

  • Just to have this out of the way and that is probably not the problem: Do you have the correct database rules, that you are actually allowed to write data?

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  • 1

    setValue can fail. You’re not checking the result for errors.

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  • To detect the failures Doug talks about, you can add a completion listener as shown here: firebase.google.com/docs/database/android/…

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  • The the completion listener is not called, the client likely can’t reach the server. The most common cause of that these days is that you downloaded the google-services.json file before you created the database, so the file doesn’t contain its URL. If that is the case, you can either re-download the file and rebuild the app with it, or you can specify the URL in your code: mFirebaseDatabase = FirebaseDatabase.getInstance("your full database URL here");. For more on this, see stackoverflow.com/a/68179677

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