Android- keep user logged in to AWS Cognito

Question

I have problem with keeping user logged in to AWS Cognito in my android app. This is the code which checks that:

CognitoUser user = AppHelper.getPool().getCurrentUser();

username = user.getUserId();

if(username != null) {
     AppHelper.setUser(username);
     inUsername.setText(user.getUserId());
     user.getSessionInBackground(authenticationHandler);
}

The problem is that sometimes (I guess after some time) the app forgets the user and that code:

user.getUserId();

Returns null. However that is never null:

AppHelper.getPool().getCurrentUser();

My code basis on the code from the sample app so I cannot understand why it doesn't work. I though that there might be a problem with Cognito pool, so I changed in devices options to always remember user device, but the issue didn't disappear.

Answer 1

Hi Grzegorz Brzęczyszczykiewicz,

user.getUserId(); will always return the userid, if the referenced CognitoUser object was created with CognitoUser user = AppHelper.getPool().getCurrentUser(); after a user had previously successfully signed-in.

An explanation for the behavior you are seeing could be that the user was changed to reference a CognitoUser object which was not set to any user. This can happen when CognitoUser user = AppHelper.getPool().getCurrentUser(); is executed after clearing app data on the Android device.

Can you give provide any more details about your app, to better understand the issue? When the app executes user.getSessionInBackground(authenticationHandler); , are you able to successfully sign-in?