com.balieiro.facebook.FriendsListFragment.java Source code

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Here is the source code for com.balieiro.facebook.FriendsListFragment.java

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/*
 * ----------------------------------------------------------------------------
 * "THE BEER-WARE LICENSE" (Revision 423):
 * <balieiro@kajoo.com.br> wrote this file. As long as you retain this notice you
 * can do whatever you want with this stuff. If we meet some day, and you think
 * this stuff is worth it, you can buy me a beer in return.
 * ----------------------------------------------------------------------------
 */

package com.balieiro.facebook;

import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.LinearLayout;
import android.widget.ListView;

import com.facebook.Request;
import com.facebook.Response;
import com.facebook.Session;

public class FriendsListFragment extends Fragment {

    // This is the amount of items we will load each time user gets closer to the 
    // end of the list.
    private static final int BATCH_SIZE = 20;

    // This is the limit specified in our list to start loading the next batch of
    // items.
    protected static final int LAZY_LOAD_LIMIT = 5;

    private FriendsListAdapter mAdapter = new FriendsListAdapter(this);
    private LinearLayout mProgress;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.friends_list_fragment, container, false);
        ListView list = (ListView) view.findViewById(R.id.list_view);
        list.setAdapter(mAdapter);
        mProgress = (LinearLayout) view.findViewById(R.id.progress_layout);

        list.setOnScrollListener(new OnScrollListener() {
            @Override
            public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
                // Load more items in the bottom of this list in case user is 
                // close to the end.
                if (totalItemCount - (firstVisibleItem + visibleItemCount) < LAZY_LOAD_LIMIT
                        && totalItemCount > 0) {
                    loadItems();
                }
            }

            @Override
            public void onScrollStateChanged(AbsListView view, int scrollState) {
            }
        });
        return view;
    }

    /**
      * It seems FACEBOOK is no longer supporting the download of friends_list unless
      * users are registered to your app. Check this link:
      * https://developers.facebook.com/bugs/1502515636638396
      * The temporary solution is to enable the user as part of the test team
      * in order to retrieve the list.
      */
    private void updateFriendsList() {

        // Useless in this method. Left here for documentation
        String fqlQuery = "SELECT uid, name FROM user WHERE uid IN (SELECT uid2 FROM "
                + "friend WHERE uid1 = me()) ORDER BY first_name ASC";
        Bundle params = new Bundle();
        params.putString("q", fqlQuery);
        Session session = Session.getActiveSession();
        Request request = new Request(session, "/me/taggable_friends", params, null, mFriendListCallback);
        Request.executeBatchAsync(request);
    }

    private Request.Callback mFriendListCallback = new Request.Callback() {
        public void onCompleted(Response response) {
            MyFacebookApp.loadFriendsList(response);
            mAdapter.removeAll();
            loadItems();
        }
    };

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

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

    private void loadItems() {
        int i = 0;
        for (int x = mAdapter.getCount(); x < MyFacebookApp.getFriendsList().size(); x++) {
            mAdapter.addItem(MyFacebookApp.getFriendsList().get(x));
            if (i++ == BATCH_SIZE)
                break;
        }
        mAdapter.notifyDataSetChanged();
        mProgress.setVisibility(View.GONE);

    }

    @Override
    public void onPause() {
        super.onPause();
        mAdapter.removeAll();
    }

    @Override
    public void onResume() {
        super.onPause();
        // Verify if friends list is empty, then update it. 
        if (MyFacebookApp.isFriendListEmpty()) {
            updateFriendsList();
        } else {
            loadItems();
        }
    }

}