aws cognito with facebook login? - android

so im really confused on how the facebook login works with aws cognito in android. I was able to hook aws cognito up and the facebook log in just fine. The aws cognito guide gives me these lines of code:

 Map<String, String> logins = new HashMap<String, String>();
        logins.put("graph.facebook.com", AccessToken.getCurrentAccessToken().getToken());
        credentialsProvider.setLogins(logins);

couple questions: 1.Where do i put these lines of code? 2.How do i set up cognito user equal to the login facebook user? 3.And basically, whats a working example of this?

Hope you guys can help!

This is the following code where I have used the facebook login with federated identities from the congnito. first you need to set up the CognitoSyncManagerFile with the appropriate login credentials with the pool details . And then the following code as follows .

//initialize the facebook SDK 
 FacebookSdk.sdkInitialize(getApplicationContext());

 //If access token is already here, set fb session
        final AccessToken fbAccessToken = AccessToken.getCurrentAccessToken();
        if (fbAccessToken != null) {
            setFacebookSession(fbAccessToken);
        //    btnLoginFacebook.setVisibility(View.GONE);
        }

btnLoginFacebook = (Button) findViewById(R.id.btnLoginFacebook);
        btnLoginFacebook.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // start Facebook Login
                LoginManager.getInstance().logInWithReadPermissions(MainActivity.this, Arrays.asList("public_profile"));
                LoginManager.getInstance().registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
                    @Override
                    public void onSuccess(LoginResult loginResult) {
                        btnLoginFacebook.setVisibility(View.GONE);
                        new GetFbName(loginResult).execute();
                        setFacebookSession(loginResult.getAccessToken());
                    }

                    @Override
                    public void onCancel() {
                        Toast.makeText(MainActivity.this, "Facebook login cancelled",
                                Toast.LENGTH_LONG).show();
                    }

                    @Override
                    public void onError(FacebookException error) {
                        Toast.makeText(MainActivity.this, "Error in Facebook login " +
                                error.getMessage(), Toast.LENGTH_LONG).show();
                    }
                });
            }
        });





//Set the session with the following method
      private void setFacebookSession(AccessToken accessToken) {
                Log.i(TAG, "facebook token: " + accessToken.getToken());
                CognitoSyncClientManager.addLogins("graph.facebook.com",
                        accessToken.getToken());


            }

For more information follow the below url

https://github.com/awslabs/aws-sdk-android-samples/tree/master/CognitoSyncDemo