Android Open Source - E-merg Nearby 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  v  a 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.support.v4.app.ListFragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;
import android.widget.Toast;

import com.e_merg.R;
import com.e_merg.adapters.CenterAdapter;
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.model.LatLng;

public class NearbyFragment extends ListFragment implements OnItemClickListener{

  GPSTracker gpsTracker;
  
  OnChangeFragmentListener fragmentListener;
  IMakeCall iMakeCall;
  ListView listView;
  CenterAdapter centerAdapter;
  List<Center> listCenters;
  
  private static String url = "http://www.sharemiale.info.ke/emerg_api/index.php";
  private ProgressDialog pDialog;
  
  private static final String TAG_REQ = "get-centers";
  private LatLng currentCoordinates;
  private int radius;
  
    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";
    
    JSONArray centers = null;
  
  @Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container,
      Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    return inflater.inflate(R.layout.fragment_nearby, container,false);
  }
  
  @Override
  public void onActivityCreated(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onActivityCreated(savedInstanceState);
    
    radius = 50;
    listView = getListView();
    listCenters = new ArrayList<Center>();
      
    gpsTracker = new GPSTracker(getActivity());
        
     if(gpsTracker.hasInternetConnection()){
            
      if (gpsTracker.canGetLocation()) {

        currentCoordinates = new LatLng(gpsTracker.getLatitude(),gpsTracker.getLongitude());
        new GetCenterList().execute();
      } else {
        // can't get location
        // GPS or Network is not enabled
        // Ask user to enable GPS/network in settings
        // currentCoordinates = new LatLng(0,0);
        gpsTracker.showSettingsAlert();
      }
              
    } else {
      Toast.makeText(getActivity(), "No Internet Connection!",
          Toast.LENGTH_SHORT).show();
    }
    
  
    listView.setOnItemClickListener(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 void onItemClick(AdapterView<?> parent, View view, int position,long id) {
    // TODO Auto-generated method stub
    //call emergency number
    Center center = (Center) listView.getItemAtPosition(position);
    iMakeCall.makeCall(center.getPhone1());
    
    final String title = center.getName();
      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();
    
  }
  
  private class GetCenterList 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(currentCoordinates.latitude)));
            nameValuePairs.add(new BasicNameValuePair("lon", String.valueOf(currentCoordinates.longitude)));
            nameValuePairs.add(new BasicNameValuePair("radius", String.valueOf(radius)));
            
           // Log.d("Resquest: "," > "+);
            
            //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("")){
            centerAdapter = new CenterAdapter(getActivity());
            centerAdapter.setCenterList(listCenters);
            listView.setAdapter(centerAdapter);
              
            }else{
                Toast.makeText(getActivity(), "Error fetching emergency center(s)", Toast.LENGTH_SHORT).show();
            }

        }


    }
    
  
}//END OF CLASS NearbyFragment

Java Source Code List

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