Use Exceptions in if condition

benb :

Im using Firebase Auth in order to manage my login and register for the app.

I had like to add toast messages based on the exception that I receive.

For example, if the exception is from FirebaseAuthInvalidCredentialsException I had like to toast one message. If it is from FirebaseAuthUserCollisionException then I had like to use another toast.

I use something like:

auth.createUserWithEmailAndPassword(email, password)
        .addOnCompleteListener(SignUpActivity.this, new OnCompleteListener<AuthResult>() {
            @Override
            public void onComplete(@NonNull Task<AuthResult> task) {
                if (task.isSuccessful()) {
                    LayoutInflater inflater = LayoutInflater.from( SignUpActivity.this );
                    View toastview = inflater.inflate( R.layout.toast_registered, null );
                    Toast toast = new Toast( SignUpActivity.this );
                    toast.setView( toastview );
                    toast.setGravity( Gravity.CENTER, 0, 3 );
                    toast.setDuration( Toast.LENGTH_LONG );
                    toast.show();
                }

                if (!task.isSuccessful()) {
                    Toast.makeText(SignUpActivity.this, "toast1." + task.getException(),
                            Toast.LENGTH_SHORT).show();
                }

                if (!task.isSuccessful()) {
                    Toast.makeText(SignUpActivity.this, "toast2." + task.getException(),
                            Toast.LENGTH_SHORT).show();
                } else {
                    startActivity(new Intent(SignUpActivity.this, MainActivity.class));
                    finish();
                }
            }
        });

So basically I need to add something to the if condition however im not sure what.

I saw a use of catch but I dont think this is the situation.

Thank you

Thomas Cook :

This should do it:

auth.createUserWithEmailAndPassword(email, password)
        .addOnCompleteListener(SignUpActivity.this, new OnCompleteListener<AuthResult>() {
            @Override
            public void onComplete(@NonNull Task<AuthResult> task) {
                if (task.isSuccessful()) {
                    LayoutInflater inflater = LayoutInflater.from( SignUpActivity.this );
                    View toastview = inflater.inflate( R.layout.toast_registered, null );
                    Toast toast = new Toast( SignUpActivity.this );
                    toast.setView( toastview );
                    toast.setGravity( Gravity.CENTER, 0, 3 );
                    toast.setDuration( Toast.LENGTH_LONG );
                    toast.show();
                }
                else {
                    if (task.getException() instanceof FirebaseAuthInvalidCredentialsException) {
                         Toast.makeText(SignUpActivity.this, "toast1." + task.getException(),
                         Toast.LENGTH_SHORT).show();
                    }
                    else if (task.getException() instanceof FirebaseAuthUserCollisionException) {
                         Toast.makeText(SignUpActivity.this, "toast2." + task.getException(),
                            Toast.LENGTH_SHORT).show();
                    }   
                    startActivity(new Intent(SignUpActivity.this, MainActivity.class));
                    finish();
                }
            }
        });

So, you check if task was successful, if not you switch on error type and show corresponding toast before starting signup activity and finishing this activity.

Use Exceptions in if condition

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