com.loadsensing.app.XarxaGMaps.java Source code

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Here is the source code for com.loadsensing.app.XarxaGMaps.java

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/***
 * Copyright (c) 2012 David Garcia / Jose Antonio Gmez
 * mastersofandroid@gmail.com
 * 
 * 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.loadsensing.app;

import java.util.List;

import org.json.JSONArray;
import org.json.JSONObject;

import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;

import com.google.android.maps.GeoPoint;
import com.google.android.maps.MapActivity;
import com.google.android.maps.MapController;
import com.google.android.maps.MapView;
import com.google.android.maps.Overlay;
import com.google.android.maps.OverlayItem;
import com.loadsensing.client.JsonClient;

//Muestra las redes en un mapa de Google Maps
public class XarxaGMaps extends MapActivity {

    private static final String DEB_TAG = "LoadSensingApp_LOG";
    private String SERVER_HOST = "http://viuterrassa/Android/getLlistatXarxes.php";

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

        MapController mapController;
        MapView mapa;

        // Obtenemos una referencia al control MapView
        mapa = (MapView) findViewById(R.id.mapa);

        // Mostramos los controles de zoom sobre el mapa
        mapa.setBuiltInZoomControls(true);

        // Aadimos la capa de marcadores
        List<Overlay> mapOverlays;
        Drawable drawable;
        OverlayXarxa itemizedOverlay;

        mapOverlays = mapa.getOverlays();
        drawable = this.getResources().getDrawable(R.drawable.marker);
        itemizedOverlay = new OverlayXarxa(drawable, mapa);

        int minLatitude = Integer.MAX_VALUE;
        int maxLatitude = Integer.MIN_VALUE;
        int minLongitude = Integer.MAX_VALUE;
        int maxLongitude = Integer.MIN_VALUE;

        SharedPreferences settings = getSharedPreferences("LoadSensingApp", Context.MODE_PRIVATE);
        String address = SERVER_HOST + "?session=" + settings.getString("session", "");
        Log.d(DEB_TAG, "Requesting to " + address);

        try {
            String jsonString = JsonClient.connectString(address);

            // Convertim la resposta string a un JSONArray
            JSONArray llistaXarxesArray = new JSONArray(jsonString);

            // HashMap<String, String> xarxa = null;

            for (int i = 0; i < llistaXarxesArray.length(); i++) {
                // xarxa = new HashMap<String, String>();
                JSONObject xarxaJSON = new JSONObject();
                xarxaJSON = llistaXarxesArray.getJSONObject(i);

                float lat = Float.parseFloat(xarxaJSON.getString("Lat"));
                float lon = Float.parseFloat(xarxaJSON.getString("Lon"));
                GeoPoint point = new GeoPoint((int) (lat * 1E6), (int) (lon * 1E6));

                int latInt = point.getLatitudeE6();
                int lonInt = point.getLongitudeE6();

                // Calculamos las coordenadas mximas y mnimas, para
                // posteriormente calcular el zoom y la posicin del mapa
                // centrado
                maxLatitude = Math.max(latInt, maxLatitude);
                minLatitude = Math.min(latInt, minLatitude);
                maxLongitude = Math.max(lonInt, maxLongitude);
                minLongitude = Math.min(lonInt, minLongitude);

                OverlayItem overlayitem = new OverlayItem(point,
                        xarxaJSON.getString("Nom") + " - " + xarxaJSON.getString("Sensors") + " sensors",
                        xarxaJSON.getString("Poblacio"));

                itemizedOverlay.addOverlay(overlayitem);
                mapOverlays.add(itemizedOverlay);
            }
            // setListAdapter(adapter);

        } catch (Exception e) {
            Log.d(DEB_TAG, "Error rebent xarxes");
        }

        // Definimos zoom y centramos el mapa
        mapController = mapa.getController();
        mapController.zoomToSpan(Math.abs(maxLatitude - minLatitude), Math.abs(maxLongitude - minLongitude));
        mapController.animateTo(new GeoPoint((maxLatitude + minLatitude) / 2, (maxLongitude + minLongitude) / 2));
    }

    @Override
    protected boolean isRouteDisplayed() {
        return false;
    }

    public void goBack(View v) {
        finish();
    }

    public void onClickHome(View v) {
        goHome(this);
    }

    public void goHome(Context context) {
        final Intent intent = new Intent(context, HomeActivity.class);
        intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        context.startActivity(intent);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.menu, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle item selection
        switch (item.getItemId()) {
        case R.id.logout:
            SharedPreferences settings = getSharedPreferences("LoadSensingApp", Context.MODE_PRIVATE);
            SharedPreferences.Editor editor = settings.edit();
            editor.putString("session", "");
            editor.commit();
            Log.d(DEB_TAG, "SharedPreferences. Session restarted.");
            startActivity(new Intent(getApplicationContext(), LoginActivity.class));
            this.finish();
            return true;
        case R.id.preferences:
            startActivity(new Intent(getApplicationContext(), Preferences.class));
            return true;
        case R.id.exit:
            moveTaskToBack(true);
            return true;
        default:
            return super.onOptionsItemSelected(item);
        }
    }
}