Mapping earthquake example using api v2

Kees · July 1st, 2014, 08:37 AM

Chapter 13 in the book handles mapping of all earthquakes found in the database.
It would be more clear to select one quake from the listfragment (sometimes many spots are very close together) and show the map of that one by clicking the map part on the screen.
Moreover it would be nice to build the map using api v2, working with GoogleMap. The EarthquakeOverlay class is then no more necessary.
For that :
1. keep class Earthquake as Activity (no MapActivity)

2. insert in manifest :

Code:

  <permission
      android:name="com.example.mapdemo.permission.MAPS_RECEIVE"
      android:protectionLevel="signature" />

  <uses-feature
      android:glEsVersion="0x00020000"
      android:required="true" />

  <uses-permission android:name="com.example.mapdemo.permission.MAPS_RECEIVE" />
  <uses-permission android:name="android.permission.INTERNET" />
  <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
  <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
  <uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
  <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
  <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
  <uses-permission android:name="android.permission.VIBRATE"/>

, insert also

Code:

<uses-library android:name="com.google.android.maps"/>

under <application
, insert also

Code:

    <meta-data
        android:name="com.google.android.maps.v2.API_KEY"
        android:value="API_KEY" />

under <application
(the API_KEY should be generated from the SHA-1 fingerprint; see https://developers.google.com/maps/d...e_maps_api_key).
SHA-1 fingerprint can easily be read from eclipse menu preferences tab android subtab build.

3. EarthquakeMapFragment :

Code:

package com.paad.earthquake;

import android.app.Fragment;
import android.location.Location;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;

import com.google.android.gms.maps.CameraUpdate;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.MapView;
import com.google.android.gms.maps.MapsInitializer;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;

public class EarthquakeMapFragment extends Fragment {
  public static Quake clickedEarthquake=null;
  
  MapView mapview;
  GoogleMap googlemap;

  @Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
      // inflate and return the layout
      View v = inflater.inflate(R.layout.map_fragment, container, false);
      mapview = (MapView)v.findViewById(R.id.mapview);

      return v;
  }

  @Override
   public void onResume() {
       super.onResume();
       mapview.onResume();
   }
    
   @Override
   public void onPause() {
       mapview.onPause();
       super.onPause();
   }
    
   @Override
   public void onDestroy() {
 	  if (mapview != null)
 		  mapview.onDestroy();
       super.onDestroy();
   }
    
   @Override
   public void onLowMemory() {
       super.onLowMemory();
       mapview.onLowMemory();
   }
 
  
  @Override
  public void onActivityCreated(Bundle savedInstanceState) {
	super.onActivityCreated(savedInstanceState);
	mapview.onCreate(savedInstanceState);
	Earthquake earthquakeActivity = (Earthquake)getActivity();
    try {
	     MapsInitializer.initialize(earthquakeActivity);
	  	  if( clickedEarthquake != null) {
	  		  Location location = clickedEarthquake.getLocation();
		      LatLng latlng = new LatLng(location.getLatitude(), location.getLongitude());
		      googlemap = mapview.getMap();

		      if( googlemap != null) {
			      CameraUpdate center= CameraUpdateFactory.newLatLng(latlng);
			      CameraUpdate zoom=CameraUpdateFactory.zoomTo(2);
	
			      googlemap.moveCamera(center);
			      googlemap.animateCamera(zoom);
			      String markerText = clickedEarthquake.getDetails();
			      googlemap.addMarker(new MarkerOptions().position(latlng).title(markerText));
		      } else {
		    	Toast.makeText(earthquakeActivity, "GoogleMap == null!", Toast.LENGTH_LONG).show();  
		      }

		  }
	 } catch (Exception e) {
		 Toast.makeText(earthquakeActivity, "Exceptie : "+e.toString(), Toast.LENGTH_LONG).show();
	 }
    }
  }

Keep in mind that the object clickedEarthquake should be made in EarthquakeListFragment, after having selected a quake from the list.
Also these are just directions to use api v2 for quake map display, not the detailed story!