loginButton.registerCallback无法解析方法

Question

错误:(36,20)错误:找不到符号方法registerCallback(CallbackManager,>)

当我从我的Mainactivity调用这个registerCallback时facebook sdk 4.0's lib.这是我的课

  public class MainActivity extends Activity {
        TextView tv;
        Button loginButton;
        CallbackManager callbackManager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Log.e("Oncreate", "Now on On create");
        FacebookSdk.sdkInitialize(getApplicationContext());
        callbackManager = CallbackManager.Factory.create();
        tv =(TextView)findViewById(R.id.tv);

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

            @Override
            public void onCancel() {
                // App code
            }

            @Override
            public void onError(FacebookException exception) {
                // App code
            }
        });

        LoginManager.getInstance().registerCallback(callbackManager,
                new FacebookCallback<LoginResult>() {
                    @Override
                    public void onSuccess(LoginResult loginResult) {
                        // App code
                    }

                    @Override
                    public void onCancel() {
                        // App code
                    }

                    @Override
                    public void onError(FacebookException exception) {
                        // App code
                    }
                });

    }

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

    }
}

Answer 1

您必须调用FacebookSdk.sdkInitialize(this.getApplicationContext()) 之前 setContentView().示例代码:

super.onCreate(savedInstanceState);
FacebookSdk.sdkInitialize(this.getApplicationContext());
setContentView(R.layout.activity_login);
callbackManager = CallbackManager.Factory.create();
loginButton = (LoginButton) findViewById(R.id.loginFaceBook_button);
//etc..

另外,文件提及对任何使用loginButton.registerCallback(callbackManager, new FacebookCallback<LoginResult>() 或 LoginManager.getInstance().registerCallback (callbackManager, new FacebookCallback<LoginResult>(),不是他们两个.这是一个完整的示例代码:

private LoginButton loginButton;
private CallbackManager callbackManager;
@Override
protected void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    FacebookSdk.sdkInitialize(this.getApplicationContext());
    setContentView(R.layout.activity_login);
    callbackManager = CallbackManager.Factory.create();
    loginButton = (LoginButton) findViewById(R.id.loginFaceBook_button);
    List<String> permissionNeeds = Arrays.asList("user_photos", "email", "user_birthday", "public_profile");
    loginButton.setReadPermissions(permissionNeeds);
    loginButton.registerCallback(callbackManager, new FacebookCallback<LoginResult>()
    {
        @Override
        public void onSuccess(LoginResult loginResult)
        {
            System.out.println("onSuccess");
        }

        @Override
        public void onCancel()
        {
            System.out.println("onCancel");
        }

        @Override
        public void onError(FacebookException exception)
        {
            Log.v("LoginActivity", exception.getCause().toString());
        }
    });

别忘了包括onActivityResult:

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

Answer 2

loginButton必须是类型LoginButton而不是Button.

不相关:您不需要在loginButton和上注册回调LoginManager.getInstance().前者用于loginButton流量,后者用于自己的按钮或登录触发器.事实上,Facebook的文档并不清楚,不是你的错.