Android Open Source - JsonPullParser Main Activity

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License

The source code is released under:

Apache License

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Java Source Code

/*
 * Copyright 2011 vvakame <vvakame@gmail.com>
 */*from w w  w.j a v a2 s .c om*/
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package net.vvakame.jsonpullparser.android.sample;

import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URL;

import net.vvakame.twitter.ResultTweet;
import net.vvakame.twitter.SearchResultGen;
import net.vvakame.util.jsonpullparser.JsonFormatException;
import net.vvakame.util.jsonpullparser.util.OnJsonObjectAddListener;
import android.app.ListActivity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.widget.ArrayAdapter;

public class MainActivity extends ListActivity {

  final static String PUBLIC_TIMELINE_URL = "http://search.twitter.com/search.json?q=Android";

  ArrayAdapter<String> mAdapter;

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    mAdapter = new ArrayAdapter<String>(this,
        android.R.layout.simple_list_item_1);
    setListAdapter(mAdapter);
  }

  @Override
  protected void onResume() {
    super.onResume();
    new TweetDownloadTask().execute();
  }

  class TweetDownloadTask extends AsyncTask<Void, ResultTweet, Void> {
    OnJsonObjectAddListener listener = new OnJsonObjectAddListener() {
      @Override
      public void onAdd(Object obj) {
        if (obj instanceof ResultTweet) {
          ResultTweet tweet = (ResultTweet) obj;
          publishProgress(tweet);
        }
      }
    };

    @Override
    protected void onPreExecute() {
      super.onPreExecute();
      mAdapter.clear();
    }

    @Override
    protected Void doInBackground(Void... params) {

      try {
        URL url = new URL(PUBLIC_TIMELINE_URL);
        HttpURLConnection urlConnection = (HttpURLConnection) url
            .openConnection();
        try {
          SearchResultGen.get(urlConnection.getInputStream(),
              listener);
        } finally {
          urlConnection.disconnect();
        }
      } catch (JsonFormatException e) {
        Log.e("JsonPullParser", "WRYYYYYYY", e);
      } catch (IOException e) {
        Log.e("JsonPullParser", "WRYYYYYYY", e);
      }

      return null;
    }

    @Override
    protected void onProgressUpdate(ResultTweet... progress) {
      for (ResultTweet tweet : progress) {
        mAdapter.add(tweet.getText());
        mAdapter.notifyDataSetChanged();
      }
    }
  }
}

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