android - 未调用 Facebook LoginManager 回调

Question

我使用的是 Facebook SDK 4.1。我已将 fb 登录按钮添加到 fragment 中，并将代码设置如下:

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {

    View view= inflater.inflate(R.layout.fragment_login, container, false);

    LoginButton loginButton = (LoginButton) view.findViewById(R.id.login_button);
    loginButton.setReadPermissions(Arrays.asList("public_profile", "email",
            "user_birthday", "user_about_me"));

    loginButton.setFragment(this);


    return view;
}

然后我有这样的 Activity

public class MainActivity extends AppCompatActivity {

    private CallbackManager callbackManager;

    private AccessTokenTracker accessTokenTracker;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        FacebookSdk.sdkInitialize(getApplicationContext());
        setContentView(R.layout.activity_main);

        callbackManager = CallbackManager.Factory.create();

        LoginManager.getInstance().registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
            @Override
            public void onSuccess(LoginResult loginResult) {
                Log.i("login","success");
            }

            @Override
            public void onCancel() {
                Log.i("login","cancel");
            }

            @Override
            public void onError(FacebookException e) {
                Log.i("login","error");
            }
        });


        accessTokenTracker = new AccessTokenTracker() {
            @Override
            protected void onCurrentAccessTokenChanged(
                    AccessToken oldAccessToken,
                    AccessToken currentAccessToken) {
                // App code
                if(currentAccessToken.isExpired()){
                    LoginManager.getInstance().logOut();
                }
            }
        };

        AccessToken accessToken=AccessToken.getCurrentAccessToken();

        if(accessToken==null||accessToken.isExpired()){
            LoginManager.getInstance().logOut();
            getSupportFragmentManager().beginTransaction()
                    .replace(R.id.frame_container, new LoginFragment())
                    .commitAllowingStateLoss();
        }

    }

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

    }


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

    @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) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}

问题是 callbackManager.onActivityResult(requestCode, resultCode, data);在 onActivityResult 方法中被调用，但 LoginManager.getInstance().registerCallback(callbackManager, new FacebookCallback()... 永远不会被调用。为什么会这样？

Answer 1

我删除了 loginButton.setFragment(this);来自 fragment 的行并且正在工作