FacebookSdk.sdkInitialize(getApplicationContext());
        setContentView(R.layout.activity_main);
        loginButton = (LoginButton) findViewById(R.id.fb_log_in);

        callbackManager = CallbackManager.Factory.create();
        loginButton.registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
            @Override
            public void onSuccess(LoginResult loginResult) {
                startActivity(new Intent(MainActivity.this, newPageActivity.class));
                String token = AccessToken.getCurrentAccessToken().getToken();
                new FacebookCognitoSync().execute(token);//Cognito integration that works as an async task in the background

            }

            @Override
            public void onCancel() {
            textView.setText("Log in canceled");
            }

            @Override
            public void onError(FacebookException error) {

            }
        });


    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        callbackManager.onActivityResult(requestCode, resultCode, data);

    }





	public class BackgroundCognitoLogin extends AsyncTask<String, Void, String> { //takes fb token and passes it to cognito
    @Override
    protected String doInBackground(String... params)
    {
        String token = params[0];
        Log.d("Background Worker", token);
        CognitoCachingCredentialsProvider credentialsProvider = new CognitoCachingCredentialsProvider(
                getApplicationContext(),
                "us-west-2:4fee8a94-c22c-4bdd-ba86-da488133e4f0", // Identity pool ID
                Regions.US_WEST_2 // Region
        );


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

        // Initialize the Cognito Sync client
        CognitoSyncManager syncClient = new CognitoSyncManager(
                getApplicationContext(),
                Regions.US_WEST_2, // Region
                credentialsProvider);

        credentialsProvider.refresh();
        return "Success";
    }


}