Error in Friendlist picker facebook android app

I got correct results of facebook profile info and profile image, but I also need to get the facebook friends list. Hence no errors in syntax and runtime but no effect when I click on the friend picker button.

I'm new in Facebook app development, I'm following the tutorial for Getting started with Facebook and I found errors.

main activity

import java.util.ArrayList;

import java.util.List;

import android.app.AlertDialog;

import android.content.Intent;

import android.os.Bundle;

import android.support.v4.app.FragmentActivity;

import android.support.v4.app.FragmentManager;

import android.text.TextUtils;

import android.util.Log;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.TextView;

import android.widget.Toast;

import com.facebook.FacebookException;

import com.facebook.Session;

import com.facebook.SessionState;

import com.facebook.UiLifecycleHelper;

import com.facebook.model.GraphPlace;

import com.facebook.model.GraphUser;

import com.facebook.widget.FriendPickerFragment;

import com.facebook.widget.LoginButton;

import com.facebook.widget.LoginButton.UserInfoChangedCallback;

import com.facebook.widget.PickerFragment;

import com.facebook.widget.ProfilePictureView;

public class MainActivity extends FragmentActivity implements OnClickListener {

private static final String LOGTAG = "MainActivity";

private List<GraphUser> tags;

private Button pickFriendsButton;

Button locationtoast;

private ProfilePictureView profilePictureView;// 2

private LoginButton fb_loginBtn;// loginbtn

private TextView userName, userName2, userName3, userName4, text;

private UiLifecycleHelper uiHelper;

// private Button pickFriendsButton;

Button btnlogin;

String Name;

String Id;

String lastname;

String firstname;

String getUsername;

String get_gender;

enter code here

GraphPlace location;

String profileid;

String birthday;

String get_email;

// String location;

// Map<String, Object> education;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

uiHelper = new UiLifecycleHelper(this, statusCallback);

uiHelper.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

locationtoast = (Button) findViewById(R.id.location_button);

locationtoast.setOnClickListener(this);

btnlogin = (Button) findViewById(R.id.profile_view);

btnlogin.setOnClickListener(this);

profilePictureView = (ProfilePictureView) findViewById(R.id.profilePicture);// 3

text = (TextView) findViewById(R.id.text);

userName = (TextView) findViewById(R.id.user_name);

fb_loginBtn = (LoginButton) findViewById(R.id.fb_login_button);

// fb_loginBtn.setOnClickListener(this);
pickFriendsButton = (Button) findViewById(R.id.add_friend);
Session session = Session.getActiveSession();
boolean enableButtons = (session != null && session.isOpened());
pickFriendsButton.setEnabled(enableButtons);
pickFriendsButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
onClickPickFriends();
}
private void onClickPickFriends() {
final FriendPickerFragment fragment = new FriendPickerFragment();
setFriendPickerListeners(fragment);
showPickerFragment(fragment);
}
private void showPickerFragment(FriendPickerFragment fragment) {
fragment.setOnErrorListener(new PickerFragment.OnErrorListener() {
@Override
public void onError(PickerFragment<?> pickerFragment,
FacebookException error) {
String text = getString(R.string.exception,
error.getMessage());
Toast toast = Toast.makeText(MainActivity.this, text,
Toast.LENGTH_SHORT);
toast.show();
}
});
}
private void setFriendPickerListeners(
final FriendPickerFragment fragment) {
fragment.setOnDoneButtonClickedListener(new FriendPickerFragment.OnDoneButtonClickedListener() {
@Override
public void onDoneButtonClicked(
PickerFragment<?> pickerFragment) {
onFriendPickerDone(fragment);
}
});
}
private void onFriendPickerDone(FriendPickerFragment fragment) {
FragmentManager fm = getSupportFragmentManager();
fm.popBackStack();
String results = "";
List<GraphUser> selection = fragment.getSelection();
tags = selection;
if (selection != null && selection.size() > 0) {
ArrayList<String> names = new ArrayList<String>();
for (GraphUser user : selection) {
names.add(user.getName());
}
results = TextUtils.join(", ", names);
} else {
results = getString(R.string.no_friends_selected);
}
showAlert(getString(R.string.you_picked), results);
}
private void showAlert(String title, String message) {
new AlertDialog.Builder(MainActivity.this).setTitle(title)
.setMessage(message)
.setPositiveButton(R.string.ok, null).show();
}
});
fb_loginBtn.setUserInfoChangedCallback(new UserInfoChangedCallback() {
@Override
public void onUserInfoFetched(GraphUser user) {
if (user != null) {
profilePictureView.setProfileId(user.getId());// 4
userName.setText("Hello , " + user.getName()
+ "\n you logged In Uaar Alumni ");
get_email = (String) user.getProperty("email");
Name = user.getName();
Id = user.getId();
lastname = user.getLastName();
firstname = user.getFirstName();
getUsername = user.getUsername();
location = user.getLocation();
get_gender = (String) user.getProperty("gender");
} else {
userName.setText("You are not logged");
}
}
});
}
private Session.StatusCallback statusCallback = new Session.StatusCallback() {
@Override
public void call(Session session, SessionState state,
Exception exception) {
if (state.isOpened()) {
Log.d("FacebookSampleActivity", "Facebook session opened");
} else if (state.isClosed()) {
text.setText("");
Log.d("FacebookSampleActivity", "Facebook session closed");
}
}
};
@Override
public void onResume() {
super.onResume();
uiHelper.onResume();
}
@Override
public void onPause() {
super.onPause();
uiHelper.onPause();
}
@Override
public void onDestroy() {
super.onDestroy();
uiHelper.onDestroy();
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
uiHelper.onActivityResult(requestCode, resultCode, data);
}
@Override
public void onSaveInstanceState(Bundle savedState) {
super.onSaveInstanceState(savedState);
uiHelper.onSaveInstanceState(savedState);
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent i = null;
switch (v.getId()) {
// case R.id.fb_login_button:
case R.id.location_button:
i = new Intent(this, LocationGet.class);
break;
// i=new Intent (this,Main_menu.class);
// break;
case R.id.profile_view:
i = new Intent(this, ValuesShow.class);
Log.d(Name, "" + Name);
i.putExtra("Name", Name);
i.putExtra("get_gender", get_gender);
i.putExtra("lastname", lastname);
i.putExtra("firstname", firstname);
i.putExtra("Id", Id);
i.putExtra("birthday", birthday);
i.putExtra("get_email", get_email);
// i.putExtra("profileid",profileid);
break;
}
// profilePictureView.setProfileId(user.getId());
// Intent intent = new Intent(this, ValuesShow.class);
// intent.getBooleanExtra("location", location);
Log.d(lastname, "" + lastname);
Log.d(get_gender, "" + get_gender);
// Log.d(LOGTAG,"Name value name....");
startActivity(i);
}
}
' 
`enter code here}