ShowLocationActivity.java

package com.pinecone.technology.mcommerce.learning.android.chapter12;

import android.content.Context;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.view.Menu;
import android.widget.Toast;

import com.example.mapdemo.R;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.SupportMapFragment;
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 ShowLocationActivity extends FragmentActivity implements LocationListener {
	// LatLng HAMBURG = new LatLng(53.558, 9.927);
	// static final LatLng KIEL = new LatLng(53.551, 9.993);
	private GoogleMap map;
	private LatLng position;
	private LocationManager locationManager;
	private String provider;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		// Get the location manager
		locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
		// Define the criteria how to select the locatioin provider -> use
		// default
		Criteria criteria = new Criteria();
		provider = locationManager.getBestProvider(criteria, false);
		Location location = locationManager.getLastKnownLocation(provider);
		if (location != null) {
			onLocationChanged(location);
		}
	}

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

	/* Request updates at startup */
	@Override
	protected void onResume() {
		super.onResume();
		locationManager.requestLocationUpdates(provider, 400, 1, this);
	}

	/* Remove the locationlistener updates when Activity is paused */
	@Override
	protected void onPause() {
		super.onPause();
		locationManager.removeUpdates(this);
	}

	@Override
	public void onLocationChanged(Location arg0) {
		// TODO Auto-generated method stub
		position = new LatLng(arg0.getLatitude(), arg0.getLongitude());
		map = ((SupportMapFragment) getSupportFragmentManager()
				.findFragmentById(R.id.map)).getMap();
		Marker hamburg = map.addMarker(new MarkerOptions().position(position)
				.title("Hamburg"));
		// Marker kiel = map.addMarker(new MarkerOptions()
		// .position(KIEL)
		// .title("Kiel")
		// .snippet("Kiel is cool")
		// .icon(BitmapDescriptorFactory
		// .fromResource(R.drawable.ic_launcher)));

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

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

	@Override
	public void onStatusChanged(String provider, int status, Bundle extras) {
		// TODO Auto-generated method stub

	}

	@Override
	public void onProviderEnabled(String provider) {
		Toast.makeText(this, "Enabled new provider " + provider,
				Toast.LENGTH_SHORT).show();
	}

	@Override
	public void onProviderDisabled(String provider) {
		Toast.makeText(this, "Disabled provider " + provider,
				Toast.LENGTH_SHORT).show();
	}
}