Question

我正在使用Android Facebook SDK（4.01）通过Facebook登录我的应用程序。从我的MainActivity登录facebook成功，然后我使用Intent来进行下一个活动。那部分有效。

之后在我的新活动（MainLobby）中，我希望能够从Facebook注销并返回到我之前的MainActivity，按下后退按钮。出于某种原因，当我按回MainLobby关闭时，但其后面还有另一个MainLobby活动。因此，我必须按两次按钮才能返回MainActivity。那是为什么？

主要活动类代码：

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

    fbloginBT = (LoginButton) findViewById(R.id.fbloginBT);
    callback = CallbackManager.Factory.create();
    fbloginBT.registerCallback(callback, new FacebookCallback<LoginResult>() {
        @Override
        public void onSuccess(LoginResult loginResult) {
            System.out.println("onSuccess");
            Intent mainLobby = new Intent(MainActivity.this, MainLobby.class);
            startActivity(mainLobby);
        }

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

        @Override
        public void onError(FacebookException e) {
            System.out.println("onError");
        }
    });
    fbloginBT.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            LoginManager.getInstance().logInWithReadPermissions(MainActivity.this, Arrays.asList("public_profile"));
        }
    });

}


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

主要大堂课程代码：

@Override
public void onBackPressed() {
    if (mDrawerLayout.isDrawerOpen(Gravity.LEFT))
        mDrawerLayout.closeDrawer(Gravity.LEFT);
    else if (searchView.isShown() && !isClosed){
        searchView.onActionViewCollapsed();  //collapse your ActionView
        searchView.setQuery("", false);       //clears your query without submit
        isClosed = true;
    }
    else {
        LoginManager.getInstance().logOut();
        super.onBackPressed();
    }
}

更新：

我在Android Studio中的模拟器上工作正常。当我在Android手机设备上测试时，它的工作原理如上所述。

Answer 1

试试这个：

private boolean isMainLobbyStarted = false;

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

    fbloginBT = (LoginButton) findViewById(R.id.fbloginBT);
    callback = CallbackManager.Factory.create();
    fbloginBT.registerCallback(callback, new FacebookCallback<LoginResult>() {
        @Override
        public void onSuccess(LoginResult loginResult) {
            System.out.println("onSuccess");
            Intent mainLobby = new Intent(MainActivity.this, MainLobby.class);
            if(!isMainLobbyStarted) {
                startActivity(mainLobby);
                isMainLobbeyStarted = true;
            }
        }

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

        @Override
        public void onError(FacebookException e) {
            System.out.println("onError");
        }
    });
    fbloginBT.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            LoginManager.getInstance().logInWithReadPermissions(MainActivity.this, Arrays.asList("public_profile"));
        }
    });

}


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

Answer 2

按如下所示更新您的代码并尝试

@Override
public void onBackPressed() {
if (mDrawerLayout.isDrawerOpen(Gravity.LEFT))
    mDrawerLayout.closeDrawer(Gravity.LEFT);
else if (searchView.isShown() && !isClosed){
    searchView.onActionViewCollapsed();  //collapse your ActionView
    searchView.setQuery("", false);       //clears your query without submit
    isClosed = true;
}

LoginManager.getInstance().logOut();
super.onBackPressed();

}

Facebook登录后重定向活动

2 个答案: