Android Open Source - E-merg Nearby Map Fragment

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License

The source code is released under:

Apache License

Java Source Code

package com.e_merg.fragments;
/*  w w  w .  ja  va 2s .  co m*/
import java.util.ArrayList;
import java.util.List;

import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;

import com.e_merg.interfaces.IMakeCall;
import com.e_merg.interfaces.OnChangeFragmentListener;
import com.e_merg.services.GPSTracker;
import com.e_merg.types.Center;
import com.e_merg.types.ServiceHandler;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.GoogleMap.OnMarkerClickListener;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.Marker;
import com.google.android.gms.maps.model.MarkerOptions;

public class NearbyMapFragment extends SupportMapFragment implements OnMarkerClickListener{

  OnChangeFragmentListener fragmentListener;
  IMakeCall iMakeCall;
    GoogleMap map;
    GPSTracker gpsTracker;

    private ProgressDialog pDialog;

    //URL to get contacts JSON
    private static String url = "http://www.sharemiale.info.ke/emerg_api/index.php";

    //JSON Node Names
    private static final String TAG_REQ = "get-centers";
    private static String TAG_SUCCESS = "success";
    private static String TAG_SUCCESS_MSG = "success_msg";
    private static String TAG_ERROR = "error";
    private static String TAG_ERROR_MSG = "error_msg";
    private static String TAG_CENTERS = "centers";
    private static String TAG_NAME = "name";
    private static String TAG_CATEGORY = "cat";
    private static String TAG_LAT = "lat";
    private static String TAG_LON = "lon";
    private static String TAG_CONTACTS = "contacts";
    private static String TAG_PHONE1 = "phone1";
    private static String TAG_PHONE2 = "phone2";
    private static String TAG_PHONE3 = "phone3";
    private static String TAG_EMAIL = "email";
    private static String TAG_SERVICES = "services";
    
    private static LatLng ME;
  private int radius;

    List<Center> listCenters;
    JSONArray centers = null;


    @Override
    public void onActivityCreated(Bundle savedInstanceState){
        super.onActivityCreated(savedInstanceState);

        radius = 50;
        map = getMap();
        listCenters = new ArrayList<Center>();
        gpsTracker = new GPSTracker(getActivity());
        
        if(gpsTracker.hasInternetConnection()){
          
          if(gpsTracker.canGetLocation()){
              
              ME = new LatLng(gpsTracker.getLatitude(),gpsTracker.getLongitude());
              new GetCenterLocations().execute();
            }else{
                // can't get location
                // GPS or Network is not enabled
                // Ask user to enable GPS/network in settings
                gpsTracker.showSettingsAlert();
            }
        }else{
          Toast.makeText(getActivity(), "No Internet Connection!", Toast.LENGTH_SHORT).show();
        }
  
        
        map.setOnMarkerClickListener(this);;
    }

    @Override
  public void onAttach(Activity activity) {
    // TODO Auto-generated method stub
    super.onAttach(activity);
    try {
            fragmentListener = (OnChangeFragmentListener)activity;
            iMakeCall = (IMakeCall)activity;
        }catch (ClassCastException e) {
            throw new ClassCastException(activity.toString() + " must implement OnChangeFragmentListener and IMakeCall");
        }
  }
    
    @Override
  public void onDetach() {
    // TODO Auto-generated method stub
    fragmentListener = null;
    iMakeCall = null;
    super.onDetach();
  }


    @Override
  public boolean onMarkerClick(Marker marker) {
    // TODO Auto-generated method stub
      final String title = marker.getTitle();
      AlertDialog.Builder alertBuilder = new AlertDialog.Builder(getActivity());
    alertBuilder.setTitle("Call Emergency");
    alertBuilder.setMessage("Call "+title);
    alertBuilder.setPositiveButton("Yes", new DialogInterface.OnClickListener(){

      @Override
      public void onClick(DialogInterface dialog, int which) {
        // TODO Auto-generated method stub
        
        for(int i=0;i<listCenters.size();i++){
          Center center = listCenters.get(i);
          if(title.equalsIgnoreCase(center.getName())){
            //call number
            iMakeCall.makeCall(center.getPhone1());
          }
        }
      }
      
    });
    
    alertBuilder.setNegativeButton("No", new DialogInterface.OnClickListener(){

      @Override
      public void onClick(DialogInterface dialog, int which) {
        // TODO Auto-generated method stub
        dialog.cancel();
      }
      
    });
    alertBuilder.create().show();
    
    return true;
  }
    

    private class GetCenterLocations extends AsyncTask<String, String, String> {

        @Override
        protected void onPreExecute(){
            super.onPreExecute();
            //showing progress dialog
            pDialog = new ProgressDialog(getActivity());
            pDialog.setMessage("Please wait...");
            pDialog.setCancelable(false);
            pDialog.show();
        }


        @Override
        protected String doInBackground(String... params) {
            // TODO Auto-generated method stub
            //Creating service handler class instance
            ServiceHandler sh = new ServiceHandler();

            List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
            nameValuePairs.add(new BasicNameValuePair("req", TAG_REQ));
            nameValuePairs.add(new BasicNameValuePair("lat", String.valueOf(ME.latitude)));
            nameValuePairs.add(new BasicNameValuePair("lon", String.valueOf(ME.longitude)));
            nameValuePairs.add(new BasicNameValuePair("radius", String.valueOf(radius)));
            
            //Making a request to url and getting response
            String jsonStr = sh.makeServiceCall(url, ServiceHandler.POST,nameValuePairs);

            //shows the response gotten from the http request
            Log.d("Response: "," > "+jsonStr);

            if(jsonStr != null){

                try {
                  JSONObject jsonObj = new JSONObject(jsonStr);
                  String success = jsonObj.getString(TAG_SUCCESS);
                  if(success != null && success.equalsIgnoreCase("1")){   
                      centers = jsonObj.getJSONArray(TAG_CENTERS);
                  Center center;
                  
                      //looping through all items
                      for(int i=0;i<centers.length();i++){
                          JSONObject s = centers.getJSONObject(i);
  
                          String name = s.getString(TAG_NAME);
                          String category = s.getString(TAG_CATEGORY);
                          String lat = s.getString(TAG_LAT);
                          String lon = s.getString(TAG_LON);
                          
                          JSONArray contacts = s.getJSONArray(TAG_CONTACTS);
                          JSONObject contact = contacts.getJSONObject(0);
                          
                          String phone1 = contact.getString(TAG_PHONE1);
                          String phone2 = contact.getString(TAG_PHONE2);
                          String phone3 = contact.getString(TAG_PHONE3);
                          
                          String email = s.getString(TAG_EMAIL);
                          String services = s.getString(TAG_SERVICES);
                          
                          
                      center = new Center(name, Double.parseDouble(lat), Double.parseDouble(lon), phone1,phone2,phone3,services,category,email);
                      listCenters.add(center);
  
                      }
  
                      return jsonObj.getString(TAG_SUCCESS_MSG);
                  }else{
                    String error = jsonObj.getString(TAG_ERROR);
                    if(error != null && error.equalsIgnoreCase("1")){  
                      return jsonObj.getString(TAG_ERROR_MSG);
                    }else{
                      return "";
                    }
                  }
                } catch (JSONException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                    return "";
                }

            }else{
                return "";
            }

        }


        @Override
        protected void onPostExecute(String result){
            super.onPostExecute(result);

            if(pDialog.isShowing()){
                pDialog.dismiss();
            }


            if(!result.equalsIgnoreCase("")){

                //add markers
                for(int i=0;i<listCenters.size();i++){
                    Center center= listCenters.get(i);
                    map.addMarker(new MarkerOptions().position(new LatLng(center.getLat(),center.getLon()))
                            .title(center.getName())
                            .icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED)));
                }

                map.addMarker(new MarkerOptions()
                .position(ME)
                .title("Me")
                .icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_GREEN)));


                // Move the camera instantly to sbs with a zoom of 15.
                map.moveCamera(CameraUpdateFactory.newLatLngZoom(ME, 15));

            // Zoom in, animating the camera.
                map.animateCamera(CameraUpdateFactory.zoomTo(10), 2000, null);

            }else{
                Toast.makeText(getActivity(), "Error fetching emergency center(s)", Toast.LENGTH_SHORT).show();
            }

        }


    }

}//END OF CLASS NearbyMapFragment

Java Source Code List

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