成功登入Android后如何隐藏Facebook登入页面活动？ [英] How to hide the Facebook Login page activity after successful login in android?

问题描述

我是Android的新手。在我的 Android 应用程序中，我已经有了$ code> Facebook 。我有一个带有按钮的登录页面。点击该按钮，就会出现FB登录页面。成功登录Facebook后，用户将进入MainActivity。成功登录FB后，我想隐藏我的登录页面。也就是说，当我重新加载应用程序时，如果用户已经登录，那么MainActivity只应该被分配，而不是登录页面。

我的代码如下：

  public class Login extends Activity {
 private static final String URL_PREFIX_FRIENDS =https://graph.facebook.com /我的/朋友=的access_token？; 
 
 //私有TextView textInstructionsOrLink; 
 private ImageButton buttonLoginLogout; 
 public static final String PREFS_PRIVATE =PREFS_PRIVATE; 
私人按钮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）; 
会话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）; 
会话session = Session.getActiveSession（）; 
 Session.saveSession（session，outState）; 
} 
 @Override 
 protected void onDestroy（）{
 
 super.onDestroy（）; 
 
} 
 private void updateView（）{
会话session = Session.getActiveSession（）; 
 if（session.isOpened（））{
 Request.executeMeRequestAsync（session，new Request.GraphUserCallback（）{
 
 @Override 
 public void onCompleted（GraphUser user ，响应响应）{
 // TODO自动生成的方法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（）{
会话session = Session.getActiveSession（）; 
 if（！session.isOpened（）&！session.isClosed（））{
 session.openForRead（new Session.OpenRequest（this）.setCallback（statusCallback））; 
} else {
 Session.openActiveSession（this，true，statusCallback）; 
} 
} 
私有类SessionStatusCallback实现Session.StatusCallback {
 @Override 
 public void call（Session session，SessionState state，Exception exception）{
更新视图（）; 
} 
} 
} 
  

解决方案

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

所以你的完整方法看起来像下面的代码。

  private void updateView（）{
 Session session = Session.getActiveSession（）; 
 if（session.isOpened（））{
 Request.executeMeRequestAsync（session，new Request.GraphUserCallback（）{
 
 @Override 
 public void onCompleted（GraphUser user ，响应响应）{
 // TODO自动生成的方法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）; 
 
意图intent = new Intent（Login.this，MainActivity.class）; 
 startActivity（intent）; 
 
} 
} 
  pre> 
 
 
所以基本上会自动移动到下一个scr每当Facebook会议开放时，都可以使用。
 
I am a newbiew in Android. I have intergarted Facebook in my Android app. I have a Login page with a button. On click of that button the FB login page appears.After the successful login of Facebook, the user gets to go to the MainActivity. I want to hide my Login page after the successful login of FB. That is, when I reload the app, if the user has already logged in then the MainActivity only should be dispalyed and not the Login page.

My code is as follows:
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();
    }
}
}

解决方案
Just add below code inside updateView method.
Intent intent = new Intent(Login.this, MainActivity.class);
startActivity(intent);
So your full method will look something like below code. 
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);

                }
    }
So basically it will automatically moves to next screen whenever facebook session is opened.

                        
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