Facebook登录后facebook android调用功能不起作用

Question

I am trying to make a simple app in which when the user logins the facebook, the user's name is displayed in the textview. The problem is that textview does not change. I think there is some problem with the call back function. This is the code for the MainActivity. Regards

     package com.example.firstfacebook;
        import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.widget.TextView;

import com.facebook.Request;
import com.facebook.Response;
import com.facebook.Session;
import com.facebook.SessionState;
import com.facebook.model.GraphUser;

public class MainActivity extends Activity {

      @Override
      public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
       // TextView welcome = (TextView) findViewById(R.id.welcome);
        //welcome.setText("Hello!");
        // start Facebook Login
        Session.openActiveSession(this, true, new Session.StatusCallback() {

          // callback when session changes state
          @Override
          public void call(Session session, SessionState state, Exception exception) {
            if (session.isOpened()) {


              // make request to the /me API
              Request.newMeRequest(session, new Request.GraphUserCallback() {

                // callback after Graph API response with user object
                @Override
                public void onCompleted(GraphUser user, Response response) {
                  if (user != null) {
                    TextView welcome = (TextView) findViewById(R.id.welcome);
                    welcome.setText("Hello " + user.getName() + "!");
                  }
                }
              });
            }
          }
        });
      }
      /*public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
            getMenuInflater().inflate(R.menu.main, menu);
            return true;
        }*/

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

    }

Answer 1

I am using android simple Facebook library project for login and posting.You don't have to call any callback method externally. This library take care of all callbacks. You might be interested in this sample project made using this library. Just have a look at it.

I hope this will use full to you.