FavoriteFragment.java

package com.v2ex.v2droid;

import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;

import org.holoeverywhere.LayoutInflater;
import org.holoeverywhere.app.Activity;
import org.holoeverywhere.app.Fragment;
import org.holoeverywhere.widget.ProgressBar;
import org.holoeverywhere.widget.Toast;
import org.jsoup.nodes.Document;

import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;

import com.actionbarsherlock.view.Menu;
import com.actionbarsherlock.view.MenuInflater;
import com.actionbarsherlock.view.MenuItem;

public class FavoriteFragment extends Fragment {
	
	private final static String TAG = "FavoriteFragment";
	
    static final String KEY_ID = "id";
	static final String KEY_TITLE = "title";
	static final String KEY_REPLIES = "replies";
	static final String KEY_USERNAME = "username";
	static final String KEY_AVATAR = "avatar";
	static final String KEY_NODE = "node";
	static final String KEY_TIME = "time";
	LazyAdapter mAdapter = null;
	ArrayList<HashMap<String, String>> topicList = null;
	ArrayList<HashMap<String, String>> tempList = null;
	private ListView listView;
	private ProgressBar progressBar;
	
	int recentPageNum = 1;

	private static FavoriteFragment instance;
	Document doc;
	private MenuItem refresh;
    boolean bRefresh = false;
    boolean bIsLastPage = false;
   	boolean bNotLoag = false;

    public static FavoriteFragment getInstance() {
        if (FavoriteFragment.instance == null) {
            return new FavoriteFragment();
        }
        return FavoriteFragment.instance;
    }

    public FavoriteFragment() {
    	FavoriteFragment.instance = this;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setRetainInstance(true);
        setHasOptionsMenu(true);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {

    	View view = null;
    	view = inflater.inflate(R.layout.fragment_favorite, null);

		return view;
    }

    @Override
    public void onViewCreated(View view) {
        super.onViewCreated(view);
        
        progressBar = (ProgressBar) view
				.findViewById(R.id.progress_bar);
        progressBar.setVisibility(View.GONE);
        
        if (topicList==null) {
        	topicList = new ArrayList<HashMap<String, String>>();
        	tempList = new ArrayList<HashMap<String, String>>();
    		new GetDataTask().execute();
    		mAdapter = new LazyAdapter((Activity)getActivity(), topicList);
        }
        
        listView = (ListView) view
				.findViewById(R.id.pull_refresh_list);
		listView.setAdapter(mAdapter);
		
		listView.setOnItemClickListener(new OnItemClickListener() {

			@Override
			public void onItemClick(AdapterView<?> parent,
					View view, int position, long id) {

				if (topicList.get(position).get(
						TopicFragment.KEY_ID) == MainActivity.MORE_TAG) {
					
					progressBar.setVisibility(View.VISIBLE);
					new GetDataTask().execute();
				} else {
					String tid = topicList.get(position).get(
							TopicFragment.KEY_ID);
					Intent contentIntent = new Intent(Intents.SHOW_CONTENT);
					contentIntent.putExtra("EXTRA_TOPIC_ID", tid);
					String node = topicList.get(position).get(
							TopicFragment.KEY_NODE);
					contentIntent.putExtra("EXTRA_NODE_NAME", node);
					getActivity().startActivity(contentIntent);
				}
			}
		});
        
    }
    
    @Override
    public void onResume() {
    	super.onResume();
    	((MainActivity) getSupportActivity()).getSupportActionBar().setTitle(R.string.favorite);	
    }
    
    private class GetDataTask extends AsyncTask<Void, Void, String[]> {

		@Override
		protected String[] doInBackground(Void... params) {
			String[] s = { "", "" };
			
			if (!bIsLastPage) {
				String url = "http://v2ex.com/my/topics?p="+recentPageNum;	
				AppContext ac = (AppContext) getActivity().getApplication();			
				tempList.clear();
				try {
					doc = ApiClient.get(ac, url, URLs.HOST).parse();
					ApiClient.getFavorites(ac, doc, tempList);
					
				} catch (IOException e) {		
				}	
			} else {
				bNotLoag = true;
			}

			return s;
		}

		@Override
		protected void onPostExecute(String[] result) {
			progressBar.setVisibility(View.GONE);
			if (bNotLoag) {				
				Toast.makeText(getActivity().getApplicationContext(), R.string.no_more,
						Toast.LENGTH_SHORT).show();
				return;
			}
			
			if (tempList.size() > 1) {
				if (bRefresh) {
					topicList.clear();
					bRefresh = false;
					if (!listView.isStackFromBottom()) {
						listView.setStackFromBottom(true);
					}
					listView.setStackFromBottom(false);
				}
				
				if (!topicList.isEmpty()) {
					topicList.remove(topicList.size() - 1);
				}
				
				for (int i=0; i < tempList.size(); i++) {
					topicList.add(tempList.get(i));
				}
				recentPageNum++;
				mAdapter.notifyDataSetChanged();
			} else {
				if (getActivity()!=null) {
					Toast.makeText(getActivity().getApplicationContext(), R.string.load_failed,
					Toast.LENGTH_SHORT).show();
				}
			}
			
			refresh.setActionView(null);

			super.onPostExecute(result);
		}
	}
    
    public void onRefresh() {
    	refresh.setActionView(R.layout.refresh);
    	bRefresh = true;
    	bNotLoag = false;
		bIsLastPage = false;
    	recentPageNum = 1;
    	new GetDataTask().execute();
    }
    
    @Override
    public void onCreateOptionsMenu(
          Menu menu, MenuInflater inflater) {
       inflater.inflate(R.menu.fragment_favorite, menu);
       refresh = menu.findItem(R.id.refresh);
       if (topicList==null || topicList.isEmpty()) {
    	   refresh.setActionView(R.layout.refresh);
       }
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
        	case android.R.id.home:
        		((MainActivity)getActivity()).toggle();
        		break;
                
            case R.id.refresh:
            	refresh.setActionView(R.layout.refresh);
            	onRefresh();
                break;

            default:
                return super.onOptionsItemSelected(item);
        }
        return true;
    }
}