Delete a user from firebase Auth when an Activity is destroyed

Question

I have an activity call ValidadorActivity, in this Activity I do a validation by SMS, right after the user registers.

The register is made by Firebase Auth however is done before this validation, so I look for a way to delete the Firebase record when the user leaves the validation screen without putting the Token that was sent by SMS correctly.

   @Override
    protected void onDestroy() {
        super.onDestroy();

        //Ao fechar completamente a tela de validação com o campo textValidacao nulo ou incorreto, o cadastro no autenticacao e no banco de dados sao apagados, para evitar o cadastro de usuarios não validados.

        String codigoDigitado = codigoValidacao.getText().toString(); //Pega o texto da caixa de texto

        if (! codigoDigitado.equals(tokenGerado)) {//Verifica se esse texto e igual

            user.delete().addOnCompleteListener(new OnCompleteListener<Void>() { //deleta o usuario no Auth
                @Override
                public void onComplete(@NonNull Task<Void> task) {

                    if (task.isSuccessful()) {//Testa para ver se funcionou

                        Log.i("Usuario deletado(auth)","Sim");


                    }else{

                        Log.i("Usuario deletado(auth)","Não");

                    }

                }
            });
}

But it is not deleting, I believe the code is right. Any idea or suggestion?

Answer 1

Opa, blza!?

It will be on onDestroy itself, but before deleting a user you need to authenticate it again, then take the data from the previous Activity and pass to this:

     final FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();

     // Obtenha credenciais de autenticação do usuário para nova autenticação. O exemplo abaixo mostra
     // credenciais de e-mail e senha, mas há vários provedores possíveis,
     // como GoogleAuthProvider ou FacebookAuthProvider.
    AuthCredential credential = EmailAuthProvider
            .getCredential("[email protected]", "password1234");

    user.reauthenticate(credential)
            .addOnCompleteListener(new OnCompleteListener<Void>() {
                @Override
                public void onComplete(@NonNull Task<Void> task) {
       user.delete()
        .addOnCompleteListener(new OnCompleteListener<Void>() {
            @Override
            public void onComplete(@NonNull Task<Void> task) {
                if (task.isSuccessful()) {
                    Log.d(TAG, "Conta deletada");
                }
            }
        });

   }
});

For more details: https://firebase.google.com/docs/auth/android/manage-users

If you want the user authentication to be with another Singin server, you need to change the Provider to Googleauthprovider. Following an example code:

GoogleAuthProvider.getCredential(googleIdToken,null);