Android Open Source - AndroidTwitterApp Tweets List Fragment

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License

The source code is released under:
MIT License
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Java Source Code

package net.julienlecomte.apps.basictwitter.fragments;
//from   w ww  . j a va 2  s.com
import java.util.ArrayList;

import org.json.JSONArray;

import net.julienlecomte.apps.basictwitter.EndlessScrollListener;
import net.julienlecomte.apps.basictwitter.R;
import net.julienlecomte.apps.basictwitter.TweetArrayAdapter;
import net.julienlecomte.apps.basictwitter.TwitterApp;
import net.julienlecomte.apps.basictwitter.TwitterClient;
import net.julienlecomte.apps.basictwitter.models.Tweet;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v4.widget.SwipeRefreshLayout.OnRefreshListener;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

import com.loopj.android.http.AsyncHttpResponseHandler;
import com.loopj.android.http.JsonHttpResponseHandler;

public abstract class TweetsListFragment extends Fragment {
  protected SwipeRefreshLayout swipeLayout;

  protected ArrayList<Tweet> tweets;
  protected ArrayAdapter<Tweet> aTweets;
  protected ListView lvTweets;

  protected TwitterClient client;

  protected JsonHttpResponseHandler fetchOldTweetsHandler;
  protected JsonHttpResponseHandler fetchNewTweetsHandler;

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    client = TwitterApp.getRestClient();
    tweets = new ArrayList<Tweet>();
    aTweets = new TweetArrayAdapter(getActivity(), tweets);

    fetchOldTweetsHandler = new JsonHttpResponseHandler() {
      @Override
      public void onSuccess(JSONArray jsonTweets) {
        aTweets.addAll(Tweet.fromJsonArray(jsonTweets));
      }

      @Override
      public void onFailure(Throwable e, String s) {
        Log.d("debug", e.toString());
        // TODO: localize error message...
        Toast.makeText(getActivity(), "Oops,  an error occurred:\n" + e.toString(),
            Toast.LENGTH_SHORT).show();
      }

      @Override
      public void onFinish() {
        swipeLayout.setRefreshing(false);
      }
    };

    fetchNewTweetsHandler = new JsonHttpResponseHandler() {
      @Override
      public void onSuccess(JSONArray jsonTweets) {
        tweets.addAll(0, Tweet.fromJsonArray(jsonTweets));
        aTweets.notifyDataSetChanged();
      }

      @Override
      public void onFailure(Throwable e, String s) {
        Log.d("debug", e.toString());
        // TODO: localize error message...
        Toast.makeText(getActivity(), "Oops,  an error occurred:\n" + e.toString(),
            Toast.LENGTH_SHORT).show();
      }

      @Override
      public void onFinish() {
        swipeLayout.setRefreshing(false);
      }
    };
  }

  @Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container,
      Bundle savedInstanceState) {
    View v = inflater.inflate(R.layout.fragment_tweets_list, container, false);

    swipeLayout = (SwipeRefreshLayout) v.findViewById(R.id.swipe_container);

      swipeLayout.setOnRefreshListener(new OnRefreshListener() {
      @Override
      public void onRefresh() {
        fetchNewTweets();
      }
    });

      swipeLayout.setColorScheme(android.R.color.holo_blue_dark,
              android.R.color.holo_green_dark,
              android.R.color.holo_orange_dark,
              android.R.color.holo_red_dark);

    lvTweets = (ListView) v.findViewById(R.id.lvTweets);
    lvTweets.setAdapter(aTweets);

    lvTweets.setOnScrollListener(new EndlessScrollListener() {
      @Override
      public void onLoadMore(int page, int totalItemsCount) {
        String max_id = null;

        if (tweets.size() > 0) {
          max_id = String.valueOf(tweets.get(tweets.size()-1).getUid());
        }

        fetchOldTweets(max_id);
      }
    });

    populateTimeline();

    return v;
  }

  protected void populateTimeline() {
    fetchOldTweets(null);
  }

  protected void fetchOldTweets(String max_id) {
    swipeLayout.setRefreshing(true);
    getTimeline(null, max_id, fetchOldTweetsHandler);
  }

  public void fetchNewTweets() {
    swipeLayout.setRefreshing(true);

    String since_id = null;

    if (tweets.size() > 0) {
      since_id = String.valueOf(tweets.get(0).getUid());
    }

    getTimeline(since_id, null, fetchNewTweetsHandler);
  }

  abstract protected void getTimeline(String since_id, String max_id,
      AsyncHttpResponseHandler handler);
}
Java Source Code List
