Android Open Source - Locast-Core-Android Remote Tags Adapter

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License

The source code is released under:

GNU General Public License

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Java Source Code

package edu.mit.mobile.android.locast.widget;
/*/*from  www.  j av  a  2s . c om*/
 * Copyright (C) 2010  MIT Mobile Experience Lab
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
import java.util.Date;
import java.util.List;

import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.AsyncTask;
import android.widget.ArrayAdapter;
import edu.mit.mobile.android.locast.net.NetworkClient;

public class RemoteTagsAdapter extends ArrayAdapter<String>{
  private final static long cacheAge = 60 * 1000;
  private long lastUpdated = 0;
  private boolean updating = false;

  final ConnectivityManager cm;
    private final NetworkClient mNc;

    public RemoteTagsAdapter(Context context, NetworkClient nc, int textViewResourceId) {
    super(context, textViewResourceId);
      cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        mNc = nc;
  }

    public void refreshTags(){

      final NetworkInfo activeNet = cm.getActiveNetworkInfo();
      final boolean hasNetConnection = activeNet != null && activeNet.isConnected();
    if (hasNetConnection && !updating && (lastUpdated == 0 || (new Date().getTime() - lastUpdated > cacheAge))){
      new TagLoaderTask().execute();
    }
    }

  private class TagLoaderTask extends AsyncTask<Void, Integer, List<String>>{

    @Override
    protected void onPreExecute() {
      updating = true;
    }
    @Override
    protected List<String> doInBackground(Void... params) {

      try {
        final Context context = getContext();
                final List<String> tags = mNc.getTagsList();
        lastUpdated = new Date().getTime();
        return tags;

      } catch (final Exception e) {
        e.printStackTrace();
      }
      return null;
    }

    @Override
    protected void onPostExecute(List<String> result) {
      if (result != null){
        // bulk load the items into the array
        RemoteTagsAdapter.this.setNotifyOnChange(false);
        RemoteTagsAdapter.this.clear();
        for (final String tag: result){
          RemoteTagsAdapter.this.add(tag);
        }
        RemoteTagsAdapter.this.notifyDataSetChanged();
        RemoteTagsAdapter.this.setNotifyOnChange(true);
      }
      updating = false;
    }
  }

}

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