Firebase Workshop Signin 관련 코드 조각들

SessionManagement.java

//in MainActivity.java
   
   @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        if (FirebaseAuth.getInstance().getCurrentUser() != null) {
            showMessageListFragment();
        } else {
            FragmentTransaction tr = getSupportFragmentManager().beginTransaction();
            tr.add(R.id.activity_main, new LoginFragment());
            tr.commit();
        }
    }

SignInAsGuest.java

//in MessageListFragment.java

    private void signInAsGuest() {
        // TODO implement Guest sign in
        FirebaseAuth.getInstance().signInAnonymously()
                .addOnSuccessListener(new OnSuccessListener<AuthResult>() {
                    @Override
                    public void onSuccess(AuthResult authResult) {
                        notifyLoginCompleted(authResult.getUser());
                    }
                })
                .addOnFailureListener(new OnFailureListener() {
                    @Override
                    public void onFailure(@NonNull Exception e) {
                        Toast.makeText(getContext(), "Fail to Login:" + e.getMessage(), Toast.LENGTH_LONG).show();
                    }
                });
    }

SignInWithGoogle.java

//in MessageListFragment.java

    private static final int RC_GOOGLE_SIGN_IN = 1013;
    private void signInWithGoogle() {
        // ID Token is required to create AuthCredential for Firebase
        GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
                .requestIdToken(getContext().getString(R.string.default_web_client_id))
                .requestEmail()
                .build();
        
        GoogleApiClient googleApiClient = new GoogleApiClient.Builder(getContext())
                .enableAutoManage(getActivity(), null)
                .addApi(Auth.GOOGLE_SIGN_IN_API, gso)
                .build();
        
        Intent signInIntent
                = Auth.GoogleSignInApi.getSignInIntent(googleApiClient);
        startActivityForResult(signInIntent, RC_GOOGLE_SIGN_IN);
    }

...

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {

        switch (requestCode) {
            case RC_GOOGLE_SIGN_IN:
                GoogleSignInResult result = Auth.GoogleSignInApi.getSignInResultFromIntent(data);
                if (result.isSuccess()) {
                    // Google Sign In was successful, authenticate with Firebase
                    GoogleSignInAccount account = result.getSignInAccount();
                    firebaseAuthWithGoogle(account);
                } else {
                    // Google Sign In failed
                    Log.e(TAG, "Google Sign In failed.");
                    notifyLoginFailed();
                }
                break;
            default:
                super.onActivityResult(requestCode, resultCode, data);
        }
    }  
  
    private void firebaseAuthWithGoogle(GoogleSignInAccount acct) {
        Log.d(TAG, "firebaseAuthWithGoogle:" + acct.getId());
        //Create AuthCredential by using IdToken from GoogleSignInAccount
        AuthCredential credential = GoogleAuthProvider.getCredential(acct.getIdToken(), null);
        mFirebaseAuth.signInWithCredential(credential)
                .addOnSuccessListener(new OnSuccessListener<AuthResult>() {
                    @Override
                    public void onSuccess(AuthResult authResult) {
                        notifyLoginCompleted(authResult.getUser());
                    }
                })
                .addOnFailureListener(new OnFailureListener() {
                    @Override
                    public void onFailure(@NonNull Exception e) {
                        Toast.makeText(getContext(), "Fail to Login:" + e.getMessage(), Toast.LENGTH_LONG).show();
                    }
                });
    }

SignOut.java

 //in MessageListFragment.java

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case R.id.sign_out_menu:
                //TODO implement sign out feature here
                final FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
                if (user.getProviderId() != null) {
                    googleAccountSignOut();
                }
                FirebaseAuth.getInstance().signOut();
                loginListener.onLogoutCompleted(null);
                return true;
        }

        return super.onOptionsItemSelected(item);
    }

    private void googleAccountSignOut() {
        Auth.GoogleSignInApi.signOut(GoogleApiClientUtil.getInstance());
    }