Android Open Source - ShowMeTweets List Tweets Fragment

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License

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

package com.fcduarte.showmetweets.fragments;
//  ww  w. ja  v  a 2  s  . c  o m
import java.util.ArrayList;
import java.util.List;

import twitter4j.Paging;
import twitter4j.Twitter;
import twitter4j.TwitterException;
import android.os.AsyncTask;
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.AbsListView.OnScrollListener;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.TextView;

import com.fcduarte.showmetweets.R;
import com.fcduarte.showmetweets.adapters.TweetsListViewAdapter;
import com.fcduarte.showmetweets.dao.TweetDAO;
import com.fcduarte.showmetweets.dao.UserDAO;
import com.fcduarte.showmetweets.listeners.EndlessScrollListener;
import com.fcduarte.showmetweets.model.Tweet;
import com.fcduarte.showmetweets.model.User;
import com.fcduarte.showmetweets.utils.ConnectivityUtils;
import com.fcduarte.showmetweets.utils.TwitterUtils;

public class ListTweetsFragment extends Fragment {
  
  public static enum TimelineType {
    HOME,
    USER,
    MENTIONS
  }
  private ListView mTweetsListView;
  private TextView mEmptyListTweets;
  private ProgressBar mLoadingProgressBar;
  private TweetsListViewAdapter mTweetsListViewAdapter;
  protected User mUser;
  private Twitter mTwitter;
  private TweetDAO mTweetDAO;
  protected TimelineType mTimelineType;
  private TwitterUtils mTwitterUtils;
  private SwipeRefreshLayout mRefreshContainer;
  
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    
    mTwitterUtils = new TwitterUtils(getActivity());
    mTweetDAO = new TweetDAO();
    mUser = new UserDAO().findByUsername(mTwitterUtils.loadLoggedUser());

    mTwitter = mTwitterUtils.getTwitterClient();
  }

  @Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container,
      Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fragment_list_tweets, container, false);
    
    mTweetsListView = (ListView) view.findViewById(R.id.tweets_list);
    mTweetsListView.setOnScrollListener(endlessScrollListener);
    mEmptyListTweets = (TextView) view.findViewById(R.id.empty_list_tweets);

    mLoadingProgressBar = (ProgressBar) view.findViewById(R.id.progress_bar_loading);
    mTweetsListViewAdapter = new TweetsListViewAdapter(new ArrayList<Tweet>(), view.getContext());

    mTweetsListView.setAdapter(mTweetsListViewAdapter);
    
    mRefreshContainer = (SwipeRefreshLayout) view.findViewById(R.id.swipe_container);
    mRefreshContainer.setColorSchemeResources(android.R.color.holo_blue_bright);
    mRefreshContainer.setOnRefreshListener(refreshListener);
    
    return view;
  }
  
  @Override
  public void onActivityCreated(Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);
    this.synchronizeTweets(1);
  }
  
  public void synchronizeTweets(int page) {
    new SynchronizeTweetsAsyncTask().execute(page);
  }

  public void addNewTweet(Tweet tweet) {
    mTweetsListViewAdapter.addTweet(tweet);
    mTweetsListViewAdapter.notifyDataSetChanged();
    mTweetsListView.setSelection(0);
  }
  
  private OnScrollListener endlessScrollListener = new EndlessScrollListener() {
    
    @Override
    public void onLoadMore(int page, int totalItemsCount) {
      Log.i("onLoadMore()", String.format("page: %s, total items: %s", page, totalItemsCount));
      new SynchronizeTweetsAsyncTask().execute(page);
    }
  };
  
  private OnRefreshListener refreshListener = new OnRefreshListener() {

    @Override
    public void onRefresh() {
      new SynchronizeTweetsAsyncTask().execute(1);
    }
  };
  
  private class SynchronizeTweetsAsyncTask extends AsyncTask<Integer, Void, List<Tweet>> {

    @Override
    protected void onPreExecute() {
      super.onPreExecute();
      
      if (!mRefreshContainer.isRefreshing()) {
        mLoadingProgressBar.setVisibility(View.VISIBLE);
      }
    }

    @Override
    protected void onPostExecute(List<Tweet> result) {
      super.onPostExecute(result);
      
      if (mRefreshContainer.isRefreshing()) {
        mRefreshContainer.setRefreshing(false);
      } else {
        mLoadingProgressBar.setVisibility(View.GONE);
      }
      
      if (result.isEmpty() && mUser != null) {
        mTweetsListView.setEmptyView(mEmptyListTweets);
      } else {
        mTweetsListView.setEmptyView(null);
        mTweetsListViewAdapter.notifyDataSetChanged();
      }
    }

    @Override
    protected List<Tweet> doInBackground(Integer... params) {
      List<Tweet> tweets = new ArrayList<>();
      int currentPage = params[0];
      
      if (mUser == null) {
        return tweets;
      }
      
      if (ConnectivityUtils.isConnected(getActivity())) {
        tweets = syncRemoteTweets(mUser, currentPage, mTimelineType);
        mTweetsListViewAdapter.addTweets(tweets);
      } else {
        tweets = mTweetDAO.findByUser(mUser);
        mTweetsListViewAdapter.setTweets(tweets);
      }
      
      return tweets;
    }

    private List<Tweet> syncRemoteTweets(User user, int currentPage, TimelineType timelineType) {
      List<Tweet> tweets = new ArrayList<>();
      
      try {
        List<twitter4j.Status> listStatus = new ArrayList<>();
        
        switch (timelineType) {
        case HOME:
          listStatus = mTwitter.getHomeTimeline(new Paging(currentPage));
          break;

        case USER:
          listStatus = mTwitter.getUserTimeline(user.getTwitterId(), new Paging(currentPage));
          break;

        case MENTIONS:
          listStatus = mTwitter.getMentionsTimeline(new Paging(currentPage));
          break;

        default:
          break;
        }
        
        for (twitter4j.Status status : listStatus) {
          Tweet tweet = mTweetDAO.findByTwitterId(status.getId());
          
          if (tweet == null) {
            tweet = new Tweet();
            tweet.buildFromRemote(status);
            tweet.getUser().save();
            tweet.save();
          }
          
          tweets.add(tweet);
        }
      } catch (TwitterException e) {
      }
      
      return tweets;
    }
    
  }

}
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