如何在Android中成功登錄後隱藏Facebook登錄頁面活動？

Question

我是Android的新手。我在我的Android應用程序中插入了Facebook。我有一個按鈕的登錄頁面。點擊該按鈕後，FB登錄頁面出現。Facebook成功登錄後，用戶可以進入MainActivity。我想在成功登錄FB後隱藏我的登錄頁面。也就是說，當我重新加載應用時，如果用戶已經登錄，那麼只應該顯示MainActivity，而不是登錄頁面。

我的代碼如下：

public class Login extends Activity { 
private static final String URL_PREFIX_FRIENDS = "https://graph.facebook.com/me/friends?access_token="; 

//private TextView textInstructionsOrLink; 
private ImageButton buttonLoginLogout; 
public static final String PREFS_PRIVATE = "PREFS_PRIVATE"; 
private Button b; 

private Session.StatusCallback statusCallback = new SessionStatusCallback(); 
Databasehandler db=new Databasehandler(this); 
HashMap<String, String>map=new HashMap<String, String>(); 
@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.login); 
    buttonLoginLogout = (ImageButton)findViewById(R.id.imageButton1); 
    Settings.addLoggingBehavior(LoggingBehavior.INCLUDE_ACCESS_TOKENS); 
    Session session = Session.getActiveSession(); 
    if (session == null) { 
     if (savedInstanceState != null) { 
      session = Session.restoreSession(this, null, statusCallback, savedInstanceState); 
     } 
     if (session == null) { 
      session = new Session(this); 
     } 
     Session.setActiveSession(session); 
     if (session.getState().equals(SessionState.CREATED_TOKEN_LOADED)) { 
      session.openForRead(new Session.OpenRequest(this).setCallback(statusCallback)); 
     } 
    } 

    updateView(); 
} 

@Override 
public void onStart() { 
    super.onStart(); 
    Session.getActiveSession().addCallback(statusCallback); 
} 

@Override 
public void onStop() { 
    super.onStop(); 
    Session.getActiveSession().removeCallback(statusCallback); 
} 



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

@Override 
protected void onSaveInstanceState(Bundle outState) { 
    super.onSaveInstanceState(outState); 
    Session session = Session.getActiveSession(); 
    Session.saveSession(session, outState); 
} 
@Override 
protected void onDestroy() { 

    super.onDestroy(); 

} 
private void updateView() { 
    Session session = Session.getActiveSession(); 
    if (session.isOpened()) { 
     Request.executeMeRequestAsync(session,new Request.GraphUserCallback() { 

      @Override 
      public void onCompleted(GraphUser user, Response response) { 
       // TODO Auto-generated method stub 
       final String t1=user.getId(); 
       final String t2=user.getName(); 
       // SharedPreferences myPrefs =getSharedPreferences("myprefs",MODE_WORLD_READABLE); 
       int count=db.getme(); 
       if(count==0) 
       { 
       map.put("uid",t1.toString()); 
       map.put("name",t2.toString()); 
       db.insertnewuser(map); 
       } 
    } 
     }); 

     Intent ik=new Intent(Login.this,MainActivity.class); 

     ik.addFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION); 
     startActivity(ik); 
    } else { 

     buttonLoginLogout.setOnClickListener(new OnClickListener() { 
      public void onClick(View view) { onClickLogin(); } 
     }); 
    } 
} 

private void onClickLogin() { 
    Session session = Session.getActiveSession(); 
    if (!session.isOpened() && !session.isClosed()) { 
     session.openForRead(new Session.OpenRequest(this).setCallback(statusCallback)); 
    } else { 
     Session.openActiveSession(this, true, statusCallback); 
    } 
} 
    private class SessionStatusCallback implements Session.StatusCallback { 
    @Override 
    public void call(Session session, SessionState state, Exception exception) { 
     updateView(); 
    } 
} 
} 

Answer 1

只需添加以下代碼中updateView方法。

Intent intent = new Intent(Login.this, MainActivity.class); 
startActivity(intent); 

所以你的完整方法看起來像下面的代碼。

private void updateView() { 
    Session session = Session.getActiveSession(); 
    if (session.isOpened()) { 
     Request.executeMeRequestAsync(session,new Request.GraphUserCallback() { 

      @Override 
      public void onCompleted(GraphUser user, Response response) { 
       // TODO Auto-generated method stub 
       final String t1=user.getId(); 
       final String t2=user.getName(); 
       // SharedPreferences myPrefs =getSharedPreferences("myprefs",MODE_WORLD_READABLE); 
       int count=db.getme(); 
       if(count==0) 
       { 
       map.put("uid",t1.toString()); 
       map.put("name",t2.toString()); 
       db.insertnewuser(map); 

       Intent intent = new Intent(Login.this, MainActivity.class); 
       startActivity(intent); 

       } 
    } 

所以基本上它會自動移動到下一個屏幕，每當facebook會話打開。

Answer 2

//後全成登錄它隱藏的Facebook按鈕

public void onActivityResult(int requestCode, int resultCode, Intent data) { 
     super.onActivityResult(requestCode, resultCode, data); 
     callbackManager.onActivityResult(requestCode, resultCode, data); 

    //after successful login into the facebook it hide the logout button 
     loginButton.setVisibility(View.GONE); 
} 

//if you want to logout after login to facebook successfully then you want to write this line inside the onSccess() method at the end 


//after successful login into the facebook it hide the logout button 


LoginManager.getInstance().logOut();