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Pasted as Java by Guest ( 6 years ago )
public class LoginActivity extends AppCompatActivity{

    private static final int RC_SIGN_IN = 123;
    private FirebaseAuth firebaseAuth;
    private FirebaseFirestore rootRef;
    private FirebaseAuth.AuthStateListener authStateListener;


    @Override
    protected  void onCreate(Bundle saveInstanceState){
        super.onCreate(saveInstanceState);
        setContentView(R.layout.activity_login);

        final GoogleSignInOptions googleSignInOptions = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
                .requestIdToken(getString(R.string.default_web_client_id))
                .requestEmail()
                .build();

        final GoogleApiClient googleApiClient = new GoogleApiClient.Builder(getApplicationContext())
                .enableAutoManage(this, new GoogleApiClient.OnConnectionFailedListener() {
                    @Override
                    public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
                        Log.d("TAG", "Błąd logowania!");
                    }
                })
                .addApi(Auth.GOOGLE_SIGN_IN_API, googleSignInOptions)
                .build();

        SignInButton signInButton = findViewById(R.id.sign_in_button);
        signInButton.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View view){
                Intent signInIntent = Auth.GoogleSignInApi.getSignInIntent(googleApiClient);
                startActivityForResult(signInIntent, RC_SIGN_IN);
            }
        });

        firebaseAuth = FirebaseAuth.getInstance();
        rootRef = FirebaseFirestore.getInstance();

        authStateListener = new FirebaseAuth.AuthStateListener() {
            @Override
            public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
                FirebaseUser firebaseUser = firebaseAuth.getCurrentUser();
                if(firebaseUser != null){
                    Intent intent = new Intent(LoginActivity.this, MainActivity.class);
                    startActivity(intent);
                    finish();
                }
            }
        };
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if(requestCode == RC_SIGN_IN){
            GoogleSignInResult googleSignInResult = Auth.GoogleSignInApi.getSignInResultFromIntent(data);
            if(googleSignInResult.isSuccess()){
                GoogleSignInAccount googleSignInAccount = googleSignInResult.getSignInAccount();
                firebaseSignInWithGoogle(googleSignInAccount);
            } else {
                Log.d("TAG", "Nie można się zalogować");
            }
        }
    }

    @Override
    protected void onStart() {
        super.onStart();
        firebaseAuth.addAuthStateListener(authStateListener);
    }

    private void firebaseSignInWithGoogle(final GoogleSignInAccount googleSignInAccount){
        AuthCredential authCredential = GoogleAuthProvider.getCredential(googleSignInAccount.getIdToken(), null);
        firebaseAuth.signInWithCredential(authCredential).addOnCompleteListener(this, new OnCompleteListener<AuthResult>(){
            @Override
            public void onComplete(@NonNull Task<AuthResult> task) {
                if(task.isSuccessful()){
                    String userEmail = googleSignInAccount.getEmail();
                    String userName = googleSignInAccount.getDisplayName();
                    String tokenId = FirebaseInstanceId.getInstance().getToken();

                    UserModel userModel = new UserModel(userEmail, userName, tokenId);
                    rootRef.collection("users").document(userEmail).set(userModel).addOnSuccessListener(new OnSuccessListener<Void>() {
                        @Override
                        public void onSuccess(Void aVoid) {
                            Log.d("TAG", "Użytkownik stworzony pomyślnie!");
                        }
                    });
                } else{
                    Log.d("TAG", "Błąd z: " + task.getException());
                }
            }
        });
    }
}

 

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