CognitoUserPool userPool = new CognitoUserPool(this, AWSMobileClient.getInstance().getConfiguration()); is giving null value

I am using AWS cognito for login in. I don't want to hardcode the values of userPoolId, clientId , clientSecret and region. I found a way using

CognitoUserPool userPool = new CognitoUserPool(this, AWSMobileClient.getInstance().getConfiguration());

but userPool is giving null value.

awsconfiguration.json is placed in res/raw/awsconfiguration.json

Thankyou for the help in advance!!!

Elaborating on the point made in comment by Karthikeyan, you would have to ensure that the AWSMobileClient is indeed initialized before you can use it to get AWS Configuration. Following snippet demonstrates one way of achieving what you are looking for :

    CognitoUserPool cup;
    final CountDownLatch latch = new CountDownLatch(1);

    AWSMobileClient.getInstance().initialize(getApplicationContext(), new Callback<UserStateDetails>() {

                @Override
                public void onResult(UserStateDetails userStateDetails) {
                    Log.i("INIT", "onResult: " + userStateDetails.getUserState());
                    latch.countDown();
                }

                @Override
                public void onError(Exception e) {
                    Log.e("INIT", "Initialization error.", e);
                    latch.countDown();
                }
            }
    );

    try {
        latch.await();
        cup = new CognitoUserPool(getApplicationContext(), AWSMobileClient.getInstance().getConfiguration());
    } catch (InterruptedException e) {
        e.printStackTrace();
    }

Hope it helps!