CODEWITHSUNDEEP
androidfirebasefirebase-authenticationpassword-protection
user8412632
user8412632

Reputation:

Check if user has signed in using Password Authentication in Firebase

I am using password authentication of firebase. I have registered my app with firebase and enabled the email/password authentication.In my MainActivity,i have signup and login button which opens signup and login activity.If there is a successfully signup/login, i am redirecting the user to ImageActivity. Up to this it works fine.When the user is in ImageActivity and if he/she press back button,the app should close but instead i am taken to the Login/Signup Activity. I have already written the following code in onCreate of both Login/Signup Activity.

auth = FirebaseAuth.getInstance();

        if (auth.getCurrentUser() != null) {
            startActivity(new Intent(LoginActivity.this, ImageActivity.class));
            finish();
        }

I have wrote this code in my MainActivity onCreate also. Please help

Upvotes: 0

Views: 1798

Answers (2)

Niyamat Ullah
Niyamat Ullah

Reputation: 2394

To prevent this problem you can do couple of things

First: When you start ImageActivity you clear the back stack and you should declare that Image Activity as a new Task. To do that you should write following code in LoginActivity or SignupActivity

auth = FirebaseAuth.getInstance();

    if (auth.getCurrentUser() != null) {
         Intent intent = new Intent(LoginActivity.this, ImageActivity.class); // Change LoginActivity to SignupActivity if you are calling ImageActivity from SignupActivity
         intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_NEW_TASK);
         startActivity(intent);
         finish();
    }

If you start Signup/LoginActivity from MainActivity, make sure that you do the same when you start LoginActivity and SignupActivity from MainActivity.

After doing that implement onBackPressed on your ImageActivity class. And call finish() in onBackPressed. The code is below

@Override
public void onBackPressed() {
    finish();
}

After doing this I hope that your problem will be solved.

Upvotes: 1

Nguyễn Trung Hiếu
Nguyễn Trung Hiếu

Reputation: 2032

Check

mAuth.signInWithEmailAndPassword(email, password)
    .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
        @Override
        public void onComplete(@NonNull Task<AuthResult> task) {
            if (task.isSuccessful()) {
                // Sign in success, update UI with the signed-in user's information
                Log.d(TAG, "signInWithEmail:success");
                FirebaseUser user = mAuth.getCurrentUser();
                updateUI(user);
            } else {
                // If sign in fails, display a message to the user.
                Log.w(TAG, "signInWithEmail:failure", task.getException());
                Toast.makeText(EmailPasswordActivity.this, "Authentication failed.",
                        Toast.LENGTH_SHORT).show();
                updateUI(null);
            }

            // ...
        }
    });

Upvotes: 0

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