Email verification for Firebase Auth UI

Question

I am using firebase auth UI (FirebaseUI-Android) in an android app, where the user can signup with personal email, Facebook, number<

Answer 1

You can simply do it as follows,

1. Get Current Firebase User Instance,

   final FirebaseUser currentUser = mAuth.getCurrentUser();
   

2. Check if the provider is password indicating that the login method used is Email Auth,

   if(null != currentUser) {
       if("password".equals(currentUser.getProviderData().get(0).getProviderId())) {
           /* Handle Verification */
       }
   }
   

   Reference Link: https://firebase.google.com/docs/reference/android/com/google/firebase/auth/EmailAuthProvider#PROVIDER_ID

3. Check if user is already verified,

   currentUser.isEmailVerified();
   

4. If user is not verified then the following code can be used to send a verification EMail,

   if (!currentUser.isEmailVerified()) {
       /* Do Something */
   }
   
   /* Send Verification Email */
   currentUser.sendEmailVerification()
           .addOnCompleteListener(this, new OnCompleteListener() {
               @Override
               public void onComplete(@NonNull Task task) {
                   /* Check Success */
                   if (task.isSuccessful()) {
                       Toast.makeText(getApplicationContext(),
                               "Verification Email Sent To: " + currentUser.getEmail(),
                               Toast.LENGTH_SHORT).show();
                   } else {
                       Log.e(TAG, "sendEmailVerification", task.getException());
                       Toast.makeText(getApplicationContext(),
                               "Failed To Send Verification Email!",
                               Toast.LENGTH_SHORT).show();
                   }
               }
           });
   

Once you have all the pieces in place, the final code snippet should look something like below:

Final Code Snippet:

if (requestCode == RC_SIGN_IN) {
    IdpResponse response = IdpResponse.fromResultIntent(data);

    /* Success */
    if (resultCode == RESULT_OK) {
        final FirebaseUser currentUser = mAuth.getCurrentUser();

        if(null != currentUser) {
            if("password".equals(currentUser.getProviderData().get(0).getProviderId())) {
                if(!currentUser.isEmailVerified()) {
                    /* Send Verification Email */
                    currentUser.sendEmailVerification()
                        .addOnCompleteListener(this, new OnCompleteListener() {
                            @Override
                            public void onComplete(@NonNull Task task) {
                                /* Check Success */
                                if (task.isSuccessful()) {
                                    Toast.makeText(getApplicationContext(),
                                            "Verification Email Sent To: " + currentUser.getEmail(),
                                            Toast.LENGTH_SHORT).show();
                                } else {
                                    Log.e(TAG, "sendEmailVerification", task.getException());
                                    Toast.makeText(getApplicationContext(),
                                            "Failed To Send Verification Email!",
                                            Toast.LENGTH_SHORT).show();
                                }
                            }
                        });

                    /* Handle Case When Email Not Verified */
                }
            }

            /* Login Success */
            startActivity(new Intent(Login.this, MainActivity.class));
            finish();
            return;
        }
    } else {
        /* Handle Failure */
    }
}

Answer 2

@user2004685 answer above gives very good hint. But it does not work at least for the latest firebase-ui because currentUser.getProviderData().get(0).getProviderId() returns 'firebase'.

So the updated solution is

protected void onActivityResult(int requestCode, int resultCode, Intent data) {

  if (requestCode == RC_SIGN_IN) {
    IdpResponse response = IdpResponse.fromResultIntent(data);

    /* Success */
    if (resultCode == RESULT_OK) {
        final FirebaseUser currentUser = mAuth.getCurrentUser();

        if(null != currentUser) {
            if(currentUser.getEmail()!=null) {
                if(!currentUser.isEmailVerified()) {
                    /* Send Verification Email */
                    currentUser.sendEmailVerification()
                        .addOnCompleteListener(this, new OnCompleteListener() {
                            @Override
                            public void onComplete(@NonNull Task task) {
                                /* Check Success */
                                if (task.isSuccessful()) {
                                    Toast.makeText(getApplicationContext(),
                                            "Verification Email Sent To: " + currentUser.getEmail(),
                                            Toast.LENGTH_SHORT).show();
                                } else {
                                    Log.e(TAG, "sendEmailVerification", task.getException());
                                    Toast.makeText(getApplicationContext(),
                                            "Failed To Send Verification Email!",
                                            Toast.LENGTH_SHORT).show();
                                }
                            }
                        });

                    /* Handle Case When Email Not Verified */
                }
            }

            /* Login Success */
            startActivity(new Intent(Login.this, MainActivity.class));
            finish();
            return;
        }
    } else {
        /* Handle Failure */
    }
  }
}

simply replace if("password".equals(currentUser.getProviderData().get(0).getProviderId())) with if(currentUser.getEmail()!=null)