如何設置電子郵件權限時登錄Facebook（安卓）

Question

我正在一個應用程序，我想使用Facebook登錄。但我只想在開始時要求獲得「電子郵件」權限，然後在用戶想要發佈時再發布「publish_actions」。 我按照Facebook網站中的開發人員教程，但它不像我預期的那樣工作。我的問題是第一次登錄。這是我LoggingFragment的代碼：

import java.util.Arrays; 
import java.util.List; 

import android.content.Intent; 
import android.os.Bundle; 
import android.os.Message; 
import android.support.v4.app.Fragment; 
import android.util.Log; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.LinearLayout; 
import android.widget.RelativeLayout; 

import com.facebook.Session; 
import com.facebook.Session.OpenRequest; 
import com.facebook.SessionState; 
import com.facebook.UiLifecycleHelper; 
import com.facebook.widget.LoginButton; 


public class LoginFragment2 extends Fragment { 

private static final List<String> public_permissions = Arrays.asList("publish_actions"); 
private static final List<String> basic_permissions = Arrays.asList("email"); 
private boolean pendingPublishReauthorization = false; 
private static final String TAG = "LoginFragment2"; 
private UiLifecycleHelper uiHelper; 
App app; 
Boolean mLogged = false; 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    Log.d("LOGIN", "LoginFragment onCreate "); 
    uiHelper = new UiLifecycleHelper(getActivity(), callback); 
    uiHelper.onCreate(savedInstanceState); 
    app = ((App) getActivity().getApplication()); 
    mLogged = app.isLoggedIn(); 
    app.addHandler(mHandler); 
} 

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
    View view = inflater.inflate(R.layout.activity_login_activity2, container, false); 

    LoginButton authButton = (LoginButton) view.findViewById(R.id.authButton); 
    authButton.setFragment(this); 
    authButton.setReadPermissions(basic_permissions); 

    LinearLayout login_screen = (LinearLayout) view.findViewById(R.id.login_screen); 
    RelativeLayout loading_screen = (RelativeLayout) view.findViewById(R.id.loading_screen); 

    if (app.isLoggedIn()) { 
     login_screen.setVisibility(View.GONE); 
     loading_screen.setVisibility(View.VISIBLE); 
    } else { 
     login_screen.setVisibility(View.VISIBLE); 
     loading_screen.setVisibility(View.GONE); 
    } 

    return view; 
} 

@Override 
public void onResume() { 
    super.onResume(); 
    Log.d("LOGIN", "LoginFragment onResume "); 

    if (mLogged) { 
     OpenRequest openrequest = new OpenRequest(this).setPermissions(basic_permissions); 
     // For scenarios where the main activity is launched and user 
     // session is not null, the session state change notification 
     // may not be triggered. Trigger it if it's open/closed. 
     // Session session = Session.getActiveSession(); 
     Session session = new Session(getActivity()); 
     session.openForRead(openrequest); 
     if (session != null && (session.isOpened() || session.isClosed())) { 
      onSessionStateChange(session, session.getState(), null); 
     } 

     if (session != null) { 
      // OpenRequest openrequest = new 
      // OpenRequest(this).setPermissions(basic_permissions); 
      // session.openForRead(openrequest); 
      Log.d("LOGIN", "Session!=null "); 
      Log.d("LOGIN", "Session state: " + session.getState()); 
      Log.d("LOGIN", "Session spermissions: " + session.getPermissions()); 
     } 
     // } else{ 
    } 
    Session session = Session.getActiveSession(); 
    if (session != null && 
      (session.isOpened() || session.isClosed())) { 
     onSessionStateChange(session, session.getState(), null); 
    } 

    uiHelper.onResume(); 
    // } 

} 

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

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

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

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

private void onSessionStateChange(Session session, SessionState state, Exception exception) { 
    if (state.isOpened()) { 

     app.LoginApp("facebook:" + session.getAccessToken()); 
     app.setSessionFacebook(session); 
    } else if (state.isClosed()) { 
     Log.d("LOGIN", "Logged out..."); 
    } 
} 

private Session.StatusCallback callback = new Session.StatusCallback() { 
    @Override 
    public void call(Session session, SessionState state, Exception exception) { 
     onSessionStateChange(session, state, exception); 
    } 
}; 

private MsgHandler mHandler = new MsgHandler(this); 

private MsgHandler msgHandler = new MsgHandler(this); 

private static class MsgHandler extends WeakReferenceHandler<LoginFragment2> { 
    public MsgHandler(LoginFragment2 fragment) { 
     super(fragment); 
    } 

    @Override 
    public void handleMessage(LoginFragment2 mfragment, Message msg) { 

     switch (msg.what) { 
     /**************/ 

     } 
    } 
} 

的問題是，你會本身，我嘗試設置權限爲「郵箱」的onCreateView方法，將其設置爲authButton。但是，當我登錄時，會話返回擁有更多權限，包括「發佈」權限。 我不知道我做錯了什麼，因爲我只是按照Facebook的說明，並按照他們的說法打電話給它的SDK。

有沒有人有這個問題？任何想法發生了什麼？在此先感謝

也許我應該說，要求用戶確認權限的對話框顯示正確的，所以「公共信息，朋友列表和電子郵件」，這是基本信息和電子郵件，我想要的。然後，onSessionChange的回調函數返回一個具有更多權限的會話

Answer 1

如果您已經在過去授予了應用發佈權限，那麼這些權限將轉移到下一個會話（無論您使用哪種設備或網站，繼續），而不管該應用程序當前要求的初始權限。

基本上，您獲得了要求的權限的超集，因爲您已經在過去爲應用提供了更多權限。