Android Open Source - E-merg Pick Location 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.j  a  va  2s  .  c  om
import java.util.ArrayList;
import java.util.List;

import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
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.location.LocationManager;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;

import com.e_merg.interfaces.OnChangeFragmentListener;
import com.e_merg.services.GPSTracker;
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.OnMapClickListener;
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.MarkerOptions;

public class PickLocationMapFragment extends SupportMapFragment implements OnMapClickListener{

  OnChangeFragmentListener fragmentListener;
    GoogleMap map;
    GPSTracker gpsTracker;

    LocationManager locationManager;
    LatLng ME,NEW_CENTER;
    
    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 = "search-center";
    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";


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

        map = this.getMap();
        gpsTracker = new GPSTracker(getActivity());
        
        if(gpsTracker.hasInternetConnection()){
          
      if (gpsTracker.canGetLocation()) {

        ME = new LatLng(gpsTracker.getLatitude(),gpsTracker.getLongitude());

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

        // Move the camera instantly to current location with a zoom of
        // 1000.
        map.moveCamera(CameraUpdateFactory.newLatLngZoom(ME, 1000));

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

      } 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();
        }

    }

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

  @Override
  public void onMapClick(final LatLng coord) {
    // TODO Auto-generated method stub
    AlertDialog.Builder alertBuilder = new AlertDialog.Builder(getActivity());
    alertBuilder.setTitle("Pick This Location");
    alertBuilder.setMessage("You are sure you want to pick this location?");
    alertBuilder.setPositiveButton("Yes", new DialogInterface.OnClickListener(){

      @Override
      public void onClick(DialogInterface dialog, int which) {
        // TODO Auto-generated method stub
        NEW_CENTER = coord;
        dialog.cancel();
        new SearchCenter().execute();
      }
      
    });
    
    alertBuilder.setNegativeButton("No", new DialogInterface.OnClickListener(){

      @Override
      public void onClick(DialogInterface dialog, int which) {
        // TODO Auto-generated method stub
        dialog.cancel();
      }
      
    });
    alertBuilder.create().show();
  }
    
  
  private class SearchCenter 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(NEW_CENTER.latitude)));
            nameValuePairs.add(new BasicNameValuePair("lon", String.valueOf(NEW_CENTER.longitude)));
            
            //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")){   
                      
                    String success_msg = jsonObj.getString(TAG_SUCCESS_MSG);
                      //return success_msg;
                      return success;
                  }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("")){

                //MOVE TO ADD CENTER FRAGMENT
              if(result.equalsIgnoreCase("1")){
          AddCenterFragment addCenterFragment = new AddCenterFragment();
          addCenterFragment.setLocation(NEW_CENTER);
          fragmentListener.onChangeFragment(addCenterFragment);
              }else{
                Toast.makeText(getActivity(), result, Toast.LENGTH_SHORT).show();
              }

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

        }


    }
    
}//END OF CLASS PickLocationMapFragment

Java Source Code List

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