FireBase Auth UI

package com.shreesoftsolutions.apps.thescribbledstories;

import android.content.Intent;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Toast;

import com.firebase.ui.auth.AuthUI;
import com.firebase.ui.auth.ErrorCodes;
import com.firebase.ui.auth.IdpResponse;
import com.firebase.ui.auth.ResultCodes;
import com.google.firebase.FirebaseApp;
import com.google.firebase.auth.FirebaseAuth;
import com.shreesoftsolutions.apps.thescribbledstories.Utils.MenuNavigation;

import java.util.Arrays;

public class MainActivity extends AppCompatActivity {
    private View mRootView;
    private final String TAG = "MainActivity";
    private FirebaseAuth auth;
    private FirebaseApp firebaseApp;
    private static final int RC_SIGN_IN = 123;
    private MenuNavigation menuNavigation;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Log.d(TAG,"Starting Capture Text");
                startActivity(new Intent(view.getContext(), CaptureText.class));
            }
        });

        firebaseApp = FirebaseApp.initializeApp(getApplicationContext());
        auth = FirebaseAuth.getInstance();
        checkLoginStatus();
        menuNavigation = new MenuNavigation(this);
    }

    @Override
    protected void onResume() {
        super.onResume();
        checkLoginStatus();
    }

    private void checkLoginStatus(){
        if(auth.getCurrentUser() != null){
            //already signed in
            // Keep the user on this page
        }else{
            //Log the user in
            startActivityForResult(
                    AuthUI.getInstance(firebaseApp)
                            .createSignInIntentBuilder()
                            .setProviders(Arrays.asList(
                                    new AuthUI.IdpConfig.Builder(AuthUI.FACEBOOK_PROVIDER).build()
                            ))
                            .build(),
                    RC_SIGN_IN);
        }
    }

    private void callNextActivity(){
        startActivity(new Intent(this, ProfileActivity.class));
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        // RC_SIGN_IN is the request code you passed into startActivityForResult(...) when starting the sign in flow.
        if (requestCode == RC_SIGN_IN) {
            IdpResponse response = IdpResponse.fromResultIntent(data);

            // Successfully signed in
            if (resultCode == ResultCodes.OK) {
                //Signed in for the first Time.
                //Now show the profile page.
                callNextActivity();
                finish();
                return;
            } else {
                // Sign in failed
                if (response == null) {
                    // User pressed back button
                    showSnackbar(R.string.sign_in_cancelled);
                    return;
                }

                if (response.getErrorCode() == ErrorCodes.NO_NETWORK) {
                    showSnackbar(R.string.no_internet_connection);
                    return;
                }

                if (response.getErrorCode() == ErrorCodes.UNKNOWN_ERROR) {
                    showSnackbar(R.string.unknown_error);
                    return;
                }
            }

            showSnackbar(R.string.unknown_sign_in_response);
        }
    }


    private void showSnackbar(int text){
        Toast.makeText(getApplicationContext(),text,Toast.LENGTH_LONG).show();
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item){
        return menuNavigation.handleMenuOption(item);
    }
}