de.hhn.android.licenseplatedecoder.activities.OSMActivity.java Source code

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Here is the source code for de.hhn.android.licenseplatedecoder.activities.OSMActivity.java

Source

package de.hhn.android.licenseplatedecoder.activities;

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;

import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import org.osmdroid.util.GeoPoint;
import org.osmdroid.views.MapController;
import org.osmdroid.views.MapView;

import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;
import de.hhn.android.licenseplatedecoder.R;
import de.hhn.android.licenseplatedecoder.decoder.RegionInformation;

/*
 ** CLASS NAME: 
 **     OSMActivity
 **
 ** DESCRIPTION:
 **   This class represents the Open Street Maps Activity Viewer
 **
 **
 ** DEVELOPED BY:
 **   Mario Orozco Borrego (MOB)
 **
 ** SUPERVISED BY:
 **     Prof. Dr.-Ing. Permantier, Gerald
 **
 **      
 ** NOTES:
 **   It's dependent of osmdroid-android-3.0.10.jar
 **
 */

public class OSMActivity extends Activity {

    private MapView mapView;
    private MapController mapController;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.osmview);

        mapView = (MapView) findViewById(R.id.osmView);
        mapView.setBuiltInZoomControls(true);
        mapView.setMultiTouchControls(true);

        mapController = mapView.getController();
        mapController.setZoom(2);

        RegionInformation regInfo = getIntent().getExtras().getParcelable("region-info");

        String buildQuery = regInfo.getRegionName() + ", " + regInfo.getCountryName();
        Toast.makeText(this, "Query: " + buildQuery, Toast.LENGTH_SHORT).show();
        new ProcessQuery().execute(buildQuery);
    }

    public JSONArray searchLocation(String query) {
        JSONArray results = new JSONArray();

        try {
            query = URLEncoder.encode(query, "UTF-8");
        } catch (UnsupportedEncodingException e) {
            return results;
        }
        String url = "http://nominatim.openstreetmap.org/search?";
        url += "q=" + query;
        url += "&format=json";

        HttpGet httpGet = new HttpGet(url);
        DefaultHttpClient httpClient = new DefaultHttpClient();

        try {
            HttpResponse response = httpClient.execute(httpGet);
            String content = EntityUtils.toString(response.getEntity(), "utf-8");
            results = new JSONArray(content);

        } catch (Exception e) {
            Log.e("searchLocation", "Error executing url: " + url + "; " + e.getMessage());
        }

        return results;
    }

    private class ProcessQuery extends AsyncTask<String, Void, JSONArray> {
        @Override
        protected JSONArray doInBackground(String... query) {
            return searchLocation(query[0]);
        }

        // onPostExecute displays the results of the AsyncTask.
        @Override
        protected void onPostExecute(JSONArray result) {
            if (result.length() > 0) {
                try {
                    JSONObject firstResult = (JSONObject) result.get(0);
                    Double lat = firstResult.getDouble("lat");
                    Double lon = firstResult.getDouble("lon");

                    GeoPoint point = new GeoPoint((int) (lat * 1E6), (int) (lon * 1E6));
                    mapController.setZoom(15);
                    //mapController.setCenter(point);
                    mapController.animateTo(point);

                    mapView.invalidate();

                } catch (JSONException e) {
                    Log.e("OnClickListener", e.getMessage());
                }
            } else {
                Toast.makeText(OSMActivity.this, "No results found", Toast.LENGTH_SHORT).show();
            }
        }

    }

}