Android Open Source - lightbox-android-webservices Main Activity

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License

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

/**
 * Copyright (c) 2012 Lightbox/* w  ww .  ja v a  2s  .co  m*/
 *
 * 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 com.lightbox.tweetsnearby.activities;

import java.util.ArrayList;
import java.util.List;
import java.util.Locale;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.location.Location;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

import com.lightbox.android.location.LocationHelper;
import com.lightbox.android.location.LocationListener;
import com.lightbox.android.tasks.BackgroundTaskWeak;
import com.lightbox.android.utils.IntentUtils;
import com.lightbox.android.views.RemoteThumbImageView;
import com.lightbox.android.webservices.requests.ApiRequest;
import com.lightbox.android.webservices.requests.ApiRequestListener;
import com.lightbox.android.webservices.requests.ApiRequests;
import com.lightbox.tweetsnearby.R;
import com.lightbox.tweetsnearby.model.Tweet;

public class MainActivity extends Activity implements ApiRequestListener, LocationListener, OnItemClickListener {
  
  public static final String PLACE_NAME_KEY = "com.lightbox.wsdemo.activities.MainActivity.placeName";
  public static final String LATITUDE_KEY = "com.lightbox.wsdemo.activities.MainActivity.latitude";
  public static final String LONGITUDE_KEY = "com.lightbox.wsdemo.activities.MainActivity.longitude";
  
  private static final String RADIUS = "10km";
  
  private TweetListAdapter mAdapter;
  private List<Tweet> mTweets;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        mTweets = new ArrayList<Tweet>();
        mAdapter = new TweetListAdapter(this, mTweets);
        ((ListView) findViewById(R.id.list)).setAdapter(mAdapter);
        ((ListView) findViewById(R.id.list)).setOnItemClickListener(this);
        
        String placeName = getIntent().getStringExtra(PLACE_NAME_KEY);
        double latitude = getIntent().getDoubleExtra(LATITUDE_KEY, Double.NaN);
        double longitude = getIntent().getDoubleExtra(LONGITUDE_KEY, Double.NaN);    
        
        if (placeName != null && ! Double.isNaN(latitude) && ! Double.isNaN(longitude)) {
          ((TextView) findViewById(R.id.textViewLabel)).setText("Tweets around " + placeName + ":");
          retrieveTweetsAround(latitude, longitude);
        } else {
          retrieveLocation();
        }
    }

    //----------------------------------------------
  // 

    public void onOkButtonClicked(View v) {
      String placeName= ((EditText) findViewById(R.id.editTextSearch)).getText().toString();
      
      Intent intent = new Intent(this, PickPlaceActivity.class);
      intent.putExtra(PickPlaceActivity.PLACE_NAME_KEY, placeName);
      startActivity(intent);
    }
    
    //----------------------------------------------
  // Retrieving location
    
    private void retrieveLocation() {
      LocationHelper locationHelper = new LocationHelper(this, this);
      locationHelper.startRetrievingLocation();
    }
    
    @Override
    public void onUnableToFindLocation(Exception exception) {
      Toast.makeText(this, String.format("Unable to retrieve your location: %s", exception), Toast.LENGTH_LONG).show();
    }
    
    @Override
    public void onFoundLocation(Location location) {
      // Get human-readable location
      (new GetReverseGeocodedAreaTask(this, location)).execute();

      retrieveTweetsAround(location.getLatitude(), location.getLongitude());
    }
    
    //----------------------------------------------
  // Retrieving tweets
    
    private void retrieveTweetsAround(double latitude, double longitude) {
      String geocode = String.format(Locale.US, "%f,%f,%s", latitude, longitude, RADIUS);
      
        ApiRequest apiRequest = ApiRequests.defaultApiRequestFactory(this).createApiRequest("searchTwitter");
        apiRequest.addUrlParameter("geocode", geocode);
        apiRequest.addUrlParameter("lang", Locale.getDefault().getLanguage());
    apiRequest.executeAsync(this);
    }
    
  @Override
  public void onFailure(Exception exception) {
    Toast.makeText(this, String.format("Unable to retrieve tweets: %s", exception), Toast.LENGTH_LONG).show();
  }

  @Override
  public void onSuccess(Object result) {
    @SuppressWarnings("unchecked")
    List<Tweet> tweets = (List<Tweet>) result;
    mTweets.clear();
    mTweets.addAll(tweets);
    mAdapter.notifyDataSetChanged();
  }
  
  //----------------------------------------------
  // OnItemClick
  
  @Override
  public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
    Tweet tweet = mTweets.get(position);
    startActivity(IntentUtils.buildWebIntent(this, "http://twitter.com/"+tweet.getFromUser()));
  }

  /********************************
   * GetReverseGeocodedAreaTask 
   */
  private static class GetReverseGeocodedAreaTask extends BackgroundTaskWeak<MainActivity, String> {
    private Location mLocation;
    public GetReverseGeocodedAreaTask(MainActivity ref, Location location) {
      super(ref);
      mLocation = location;
    }

    @Override
    protected String doWorkInBackground() throws Exception {
      String area = null;
      Context context = getRef();
      if (context != null) {
        area = LocationHelper.getReverseGeocodedApproxArea(context, mLocation);
      }
      return area;
    }

    @Override
    protected void onCompleted(String area) {
      Context context = getRef();
      if (context != null && area != null && area.length() > 0) {
        ((TextView) ((MainActivity) context).findViewById(R.id.textViewLabel)).setText("Tweets around you (" + area + "):");
      }
    }

    @Override
    protected void onFailed(Exception e) {
      // Ignore
    }
    
  }
  
  /********************************
   * TweetListAdapter 
   */
  private static class TweetListAdapter extends ArrayAdapter<Tweet> {

    public TweetListAdapter(Context context, List<Tweet> tweets) {
      super(context, 0, 0, tweets);
    }
    
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
      View view = convertView;
      if (view == null) {
        LayoutInflater inflater = (LayoutInflater)getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        view = inflater.inflate(R.layout.tweet_item, null);
      }
      Tweet tweet = getItem(position);
      ((TextView) view.findViewById(R.id.textViewTweet)).setText(tweet.getText());
      ((RemoteThumbImageView) view.findViewById(R.id.remoteImageViewProfile)).startLoading(tweet);
      return view;
    }
        
  }

}
Java Source Code List
