android使用GPS

package com.shutao.testlocation;

import java.text.NumberFormat;
import java.util.List;

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.view.ViewGroup;
import android.widget.Button;
import android.widget.CompoundButton;
import android.widget.TextView;
import android.widget.ToggleButton;
import android.widget.CompoundButton.OnCheckedChangeListener;

import com.google.android.maps.GeoPoint;
import com.google.android.maps.MapActivity;
import com.google.android.maps.MapController;
import com.google.android.maps.MapView;
import com.google.android.maps.MyLocationOverlay;
import com.google.android.maps.Overlay;

public class TestLocationWithMap extends MapActivity {
	/** Called when the activity is first created. */
	LocationManager locationManager;
	MapView map;
	MapController mapcont;
	Button inButton, outButton;
	ToggleButton satellite_switch_button;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		/*
		 * 如要在地图上标记位置，就需要用到Overlay类。Overlay类是一种专门用于在地图上用 2d图像进行标记的类
		 */
		map = (MapView) findViewById(R.id.mapView);
		// //////////标记位置/////////////////////////////
		List<Overlay> overlays = map.getOverlays();
		MyLocationOverlay myLocation = new MyLocationOverlay(this, map);
		myLocation.enableMyLocation();
		overlays.add(myLocation);
		// 获得MapView的控制
		mapcont = map.getController();
		// ///////////使用了ZoomControls，故不用按钮控制，当应该知道////////////////////
		/*
		 * inButton = (Button) findViewById(R.id.zoomIn); outButton = (Button)
		 * findViewById(R.id.zoomOut);
		 * 
		 * OnClickListener listener = new OnClickListener() {
		 * 
		 * @Override public void onClick(View v) { switch (v.getId()) { case
		 * R.id.zoomIn: mapcont.zoomIn(); break; case R.id.zoomOut:
		 * mapcont.zoomOut(); break; default: break; } } };
		 * inButton.setOnClickListener(listener);
		 * outButton.setOnClickListener(listener);
		 */
		// ////////////////////////////////////////////
		ViewGroup zoom = (ViewGroup) findViewById(R.id.zoom);
		zoom.addView(map.getZoomControls());
		// //////////////启用卫星视图/////////////////
		satellite_switch_button = (ToggleButton) findViewById(R.id.button_satellite);
		satellite_switch_button
				.setOnCheckedChangeListener(new OnCheckedChangeListener() {
					@Override
					public void onCheckedChanged(CompoundButton buttonView,
							boolean isChecked) {
						if (isChecked) {
							map.setSatellite(true);
						} else {
							map.setSatellite(false);
						}
					}

				});
		// ///////////////////////////////
		String serviceName = Context.LOCATION_SERVICE;
		/* 获得LocationManager实例 */
		locationManager = (LocationManager) this.getSystemService(serviceName);
		// 查询条件
		Criteria criteria = new Criteria();
		criteria.setAccuracy(Criteria.ACCURACY_FINE);
		criteria.setAltitudeRequired(false);
		criteria.setBearingRequired(false);
		criteria.setCostAllowed(true);
		criteria.setPowerRequirement(Criteria.POWER_LOW);
		/* 使用GPS定位技术 */
		// v1.0 String provider = LocationManager.GPS_PROVIDER;
		// v2.0
		String provider = locationManager.getBestProvider(criteria, true);
		Location location = locationManager.getLastKnownLocation(provider);

		updateWithNewLocation(location);
		locationManager.requestLocationUpdates(provider, 2000, 5,
				locationListener);
	}

	private final LocationListener locationListener = new LocationListener() {

		@Override
		public void onLocationChanged(Location location) {
			updateWithNewLocation(location);
		}

		@Override
		public void onProviderDisabled(String provider) {
			updateWithNewLocation(null);
		}

		@Override
		public void onProviderEnabled(String provider) {
		}

		@Override
		public void onStatusChanged(String provider, int status, Bundle extras) {
		}

	};

	private void updateWithNewLocation(Location location_) {
		NumberFormat nf = NumberFormat.getInstance();
		nf.setMaximumFractionDigits(6);
		String latLongString;
		TextView myLocationText;
		myLocationText = (TextView) findViewById(R.id.locationText);
		if (location_ != null) {
			double lat = location_.getLatitude();
			double lng = location_.getLongitude();
			lat = Double.parseDouble(nf.format(lat).replaceAll(",", ""));
			lng = Double.parseDouble(nf.format(lng).replaceAll(",", ""));
			latLongString = "纬度:" + lat + "\n经度:" + lng;

			// 增强用户的体验，平滑移动到新位置
			mapcont
					.animateTo(new GeoPoint((int) (lat * 1E6),
							(int) (lng * 1E6)));
		} else {

			location_ = locationManager
					.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
			if (location_ != null) {
				double lat = location_.getLatitude();
				double lng = location_.getLongitude();
				lat = Double.parseDouble(nf.format(lat).replaceAll(",", ""));
				lng = Double.parseDouble(nf.format(lng).replaceAll(",", ""));
				latLongString = "纬度:" + lat + "\n经度:" + lng;
				mapcont.animateTo(new GeoPoint((int) (lat * 1E6),
						(int) (lng * 1E6)));
			} else {
				latLongString = "无法获取地理信息";
			}

		}
		myLocationText.setText("您当前的位置是：\n" + latLongString);
	}

	@Override
	protected boolean isRouteDisplayed() {
		return false;
	}
}