How to catch a Firebase Auth specific exceptions

Question

Using Firebase, how do I catch a specific exception and tell the user gracefully about it? E.g :

FirebaseAuthInvalidCredentialsException: The email ad

Answer 1

To catch a firebase Exception is easy, you should add .addOnFailureListener after you add .addOnCompleteListener like this:

 private void login_user(String email, String password) {

    mAuth.signInWithEmailAndPassword(email,password).addOnCompleteListener(new OnCompleteListener() {
        @Override
        public void onComplete(@NonNull Task task) {
           if(task.isSuccessful()){
               Intent intent = new Intent(getApplicationContext(),MainActivity.class);
               startActivity(intent);
               finish();
           }if(!task.isSuccessful()){


                // To know The Excepton 
                //Toast.makeText(LoginActivity.this, ""+task.getException(), Toast.LENGTH_LONG).show();

           }
        }
    }).addOnFailureListener(new OnFailureListener() {
        @Override
        public void onFailure(@NonNull Exception e) {
            if( e instanceof FirebaseAuthInvalidUserException){
                Toast.makeText(LoginActivity.this, "This User Not Found , Create A New Account", Toast.LENGTH_SHORT).show();
            }
            if( e instanceof FirebaseAuthInvalidCredentialsException){
                Toast.makeText(LoginActivity.this, "The Password Is Invalid, Please Try Valid Password", Toast.LENGTH_SHORT).show();
            }
            if(e instanceof FirebaseNetworkException){
                Toast.makeText(LoginActivity.this, "Please Check Your Connection", Toast.LENGTH_SHORT).show();
            }
        }
    });