Question

我将Facebook登录集成在我创建的原生Android应用程序中。打开Facebook Session的UiLifecycleHelper类之前工作正常，但突然会话未被打开且Session.StatusCallback未被触发且onSessionStateChange（）方法没有被调用。

public class SessionActivity extends FragmentActivity {

private static final int SIGNUP = 0;
private static final int CITYLIST = 1;
private static final int FRAGMENT_COUNT = CITYLIST+1;
private boolean isResumed = false;


private Fragment[] fragments = new Fragment[FRAGMENT_COUNT];

private UiLifecycleHelper uiHelper;
private Session.StatusCallback callback = 
    new Session.StatusCallback() {
    @Override
    public void call(Session session, 
            SessionState state, Exception exception) {
        Toast.makeText(getApplicationContext(), "UiLifecycle is called", Toast.LENGTH_SHORT).show();

        onSessionStateChange(session, state, exception);


    }
};


@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    uiHelper = new UiLifecycleHelper(this, callback);
    uiHelper.onCreate(savedInstanceState);
//  Toast.makeText(getApplicationContext(), "UiLifecycle is not called",      Toast.LENGTH_SHORT).show();

    setContentView(R.layout.activity_session);

    FragmentManager fm = getSupportFragmentManager();
    fragments[SIGNUP] = fm.findFragmentById(R.id.SignupFragment);
    fragments[CITYLIST] = fm.findFragmentById(R.id.CityListFragment);
    fragments[SETTINGS] = fm.findFragmentById(R.id.userSettingsFragment);


     FragmentTransaction transaction = fm.beginTransaction();
    for(int i = 0; i < fragments.length; i++) {
        transaction.hide(fragments[i]);
    }
    transaction.commit();

}


@Override
public void onResume() {
    super.onResume();
    uiHelper.onResume();
    isResumed = true;
}

@Override
public void onPause() {
    super.onPause();
    uiHelper.onPause();
    isResumed = false;
}

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

@Override
public void onDestroy() {
    super.onDestroy();
    uiHelper.onDestroy();
}

@Override
protected void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    uiHelper.onSaveInstanceState(outState);
}   

private void showFragment(int fragmentIndex, boolean addToBackStack) {
    Toast.makeText(getApplicationContext(), "showFragment is called", Toast.LENGTH_SHORT).show();

    FragmentManager fm = getSupportFragmentManager();
    FragmentTransaction transaction = fm.beginTransaction();
    for (int i = 0; i < fragments.length; i++) {
        if (i == fragmentIndex) {
            transaction.show(fragments[i]);
        } else {
            transaction.hide(fragments[i]);
        }
    }
    if (addToBackStack) {
        transaction.addToBackStack(null);
    }
    transaction.commit();
}


private void onSessionStateChange(Session session, SessionState state, Exception exception) {
    // Only make changes if the activity is visible
    Toast.makeText(getApplicationContext(), "onSessionStateChange is called", Toast.LENGTH_SHORT).show();

    if (isResumed) {
        FragmentManager manager = getSupportFragmentManager();
        // Get the number of entries in the back stack
        int backStackSize = manager.getBackStackEntryCount();
        // Clear the back stack
        for (int i = 0; i < backStackSize; i++) {
            manager.popBackStack();
        }
        if (state.equals(SessionState.OPENED)) {
            // If the session state is open:
            // Show the authenticated fragment
            showFragment(CITYLIST, false);

        } else if (state.isClosed()) {
            // If the session state is closed:
            // Show the login fragment
            showFragment(SIGNUP, false);
        }
    }

   }

@Override
protected void onResumeFragments() {
    super.onResumeFragments();
    Session session = Session.getActiveSession();
    Toast.makeText(getApplicationContext(), "onResumeFragments is called" + session.isOpened(), Toast.LENGTH_SHORT).show();

    if (session != null && session.isOpened()) {
        // if the session is already open,
        // try to show the selection fragment
        showFragment(CITYLIST, false);
    } else {
        // otherwise present the splash screen
        // and ask the person to login.
        showFragment(SIGNUP, false);
    }
}

}

问题

为什么UILifeCycleHelper助手没有打开新的FB会话并打开目标片段（CityListFragment）？

信息

代码工作正常之前，会话打开并且令牌已创建，并且在我进行了一些编辑后它无效。

Answer 1

我试图在我启动SessionActivity的另一个活动中使用Facebook登录按钮。我想在SessionActivity中使用fb登录按钮的原因是我希望用户单击另一个活动中的登录按钮进入SessionActivity.I通过使用SessionActivity的onCreate（）方法中的Fb loginbutton解决了这个问题，隐藏了它并使用performclick（）方法执行了点击（因为用户已经在其他活动中按下了自定义按钮i用过）。现在新的会话已经开启。

LoginButton loginBtn;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    uiHelper = new UiLifecycleHelper(this, callback);
    uiHelper.onCreate(savedInstanceState);

   loginBtn = (LoginButton) findViewById(R.id.fb_profile_activity_button);
   loginBtn.setVisibility(View.INVISIBLE);
   loginBtn.performClick();


    FragmentManager fm = getSupportFragmentManager();
    fragments[SIGNUP] = fm.findFragmentById(R.id.signup_fragment);
    fragments[CITYLIST] = fm.findFragmentById(R.id.citylist_fragment);

    FragmentTransaction transaction = fm.beginTransaction();
    for(int i = 0; i < fragments.length; i++) {
        transaction.hide(fragments[i]);
    }
    transaction.commit();
}

UiLifecycleHelper没有打开Facebook Session

1 个答案: