Question

我是firebase的新手，我想第一次实现facebook auth。我可以成功获得facebook令牌但是当我调用signInWithCredential（）时会抛出此异常。

引起：java.lang.NullPointerException：尝试调用虚拟方法＆＃39; com.google.android.gms.tasks.Task com.google.android.gms.common.api.GoogleApi.zzb（com.google.android.gms.common.api.internal.zzdf）＆＃39; 在空对象引用上

这是我的源代码

public class LoginActivity extends AppCompatActivity {

    private CallbackManager callbackManager;
    private FirebaseAuth mAuth;
    private String TAG = "Test";

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mAuth = FirebaseAuth.getInstance();
        callbackManager = CallbackManager.Factory.create();

        LoginButton loginButton = (LoginButton) findViewById(R.id.login_button);
        loginButton.registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
            @Override
            public void onSuccess(LoginResult loginResult) {

                handleFacebookAccessToken(loginResult.getAccessToken());


            }

            @Override
            public void onCancel() {


            }

            @Override
            public void onError(FacebookException e) {

            }
        });

    }

    private void handleFacebookAccessToken(AccessToken token) {

        AuthCredential credential = FacebookAuthProvider.getCredential(token.getToken());
        mAuth.signInWithCredential(credential)
                .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
                    @Override
                    public void onComplete(@NonNull Task<AuthResult> task) {
                        if (task.isSuccessful()) {

                            FirebaseUser user = mAuth.getCurrentUser();

                        } else {

                        }

                    }
                });
    }

    @Override
    public void onStart() {
        super.onStart();
        FirebaseUser currentUser = mAuth.getCurrentUser();

    }

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

感谢任何建议。

Answer 1

您必须安装Google Play服务。我想你是在模拟器上测试的。尝试在真实设备上进行测试，或确保在模拟器上安装了GPS

Answer 2

请检查您的FirebaseUI和Firebase / Play服务版本。他们必须根据您在这里找到的表格进行匹配： https://github.com/firebase/FirebaseUI-Android

Facebook登录成功但firebase auth抛出异常

2 个答案: