how to open facebook session in android - facebook

I am developing a simple app which login facebook .
I am trying to display the facebook profile name in the textview..
I am creating the app on facebook and also put appId into menifest .
In my app can not cause any error but it can't display the Facebook profile name into textview .
I found that the facebook session is not open thats why it can't connect to my bacebook account...
Here is my code :
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// 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()) {
System.out.println("Session is open....");
// make request to the /me API
Request.executeMeRequestAsync(session, new Request.GraphUserCallback() {
// callback after Graph API response with user object
#Override
public void onCompleted(GraphUser user, Response response) {
TextView welcome = (TextView) findViewById(R.id.welcome);
if (user != null) {
welcome.setText("Hello " + user.getName() + "!");
System.out.println("Hello " + user.getName());
}
else {
welcome.setText("User not present");
}
}
});
}
else {
System.out.println("Session is not open....");
}
}
});
}
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// TODO Auto-generated method stub
super.onActivityResult(requestCode, resultCode, data);
Session.getActiveSession().onActivityResult(this, requestCode,
resultCode, data);
}}
Can anybody tell mi how to connect to facebook session...
Thank u in advance.

The problem might be in key Hash.
You shud definitely see this tutorial:
https://developers.facebook.com/docs/android/getting-started
Look at the Troubleshooting section, that might help you

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I'd hate to give a vague answer, but I don't think the problem is in the code snippet. I suggest you revise your steps and make sure you followed these links completely again:
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