android GPS定位和卫星个数

 package com.pdager.gps;

    
  
    
 import java.util.ArrayList;
    
 import java.util.Iterator;
    
 import java.util.List;
    
  
    
 import android.app.Activity;
    
 import android.content.Context;
    
 import android.content.Intent;
    
 import android.location.GpsSatellite;
    
 import android.location.GpsStatus;
    
 import android.location.Location;
    
 import android.location.LocationListener;
    
 import android.location.LocationManager;
    
 import android.os.Bundle;
    
 import android.provider.Settings;
    
 import android.text.format.Time;
    
 import android.view.KeyEvent;
    
 import android.widget.TextView;
    
 import android.widget.Toast;
    
  
    
 public class getlocation extends Activity {
    
 	/** Called when the activity is first created. */
    
 	@Override
    
 	public void onCreate(Bundle savedInstanceState) {
    
 		super.onCreate(savedInstanceState);
    
 		setContentView(R.layout.main);
    
 		openGPSSettings();
    
 	}
    
  
    
 	private void openGPSSettings() {
    
 		LocationManager alm = (LocationManager) this
    
 				.getSystemService(Context.LOCATION_SERVICE);
    
 		if (alm
    
 				.isProviderEnabled(android.location.LocationManager.GPS_PROVIDER)) {
    
 			Toast.makeText(this, "GPS模块正常", Toast.LENGTH_SHORT).show();
    
 			getLocation();
    
 			return;
    
 		}
    
 		else{
    
 		Toast.makeText(this, "请开启GPS！", Toast.LENGTH_SHORT).show();
    
 		Intent intent = new Intent(Settings.ACTION_SECURITY_SETTINGS);
    
 		startActivityForResult(intent, R.layout.main); // 此为设置完成后返回到获取界面
    
 		getLocation();
    
 		return;
    
 		}
    
 	}
    
  
    
 	LocationManager locationManager;
    
  
    
 	private void getLocation() {
    
 		// 获取位置管理服务
    
  
    
 		String serviceName = Context.LOCATION_SERVICE;
    
 		locationManager = (LocationManager) this.getSystemService(serviceName);
    
 		// 查找到服务信息
    
 		// Criteria criteria = new Criteria();
    
 		// criteria.setAccuracy(Criteria.ACCURACY_FINE);
    
 		// // 高精度
    
 		// criteria.setAltitudeRequired(false);
    
 		// criteria.setBearingRequired(false);
    
 		// criteria.setCostAllowed(true);
    
 		// criteria.setPowerRequirement(Criteria.POWER_LOW);
    
 		// // 低功耗
    
 		// String provider = locationManager.getBestProvider(criteria, true);
    
 		// 获取GPS信息
    
 		String provider = LocationManager.GPS_PROVIDER;
    
  
    
 		Location location = locationManager.getLastKnownLocation(provider);// 通过GPS获取位置
    
  
    
 		if (location == null)
    
 			location = locationManager
    
 					.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
    
  
    
 		updateToNewLocation(location);
    
 		// 设置监听器，自动更新的最小时间为间隔N秒(1秒为1*1000)或最小位移变化超过N米
    
 		locationManager.requestLocationUpdates(provider, 1000, 0,
    
 				locationListener);
    
 		locationManager.addGpsStatusListener(statusListener); // 注册状态信息回调
    
 	}
    
  
    
 	private List<GpsSatellite> numSatelliteList = new ArrayList<GpsSatellite>(); // 卫星信号
    
 	/** * 卫星状态监听器
    
 	 */
    
 	private final GpsStatus.Listener statusListener = new GpsStatus.Listener() {
    
 		public void onGpsStatusChanged(int event) { // GPS状态变化时的回调，如卫星数
    
 			GpsStatus status = locationManager.getGpsStatus(null); // 取当前状态
    
 			updateGpsStatus(event, status);
    
 		}
    
 	};
    
  
    
 	private void updateGpsStatus(int event, GpsStatus status) {
    
 		if (event == GpsStatus.GPS_EVENT_SATELLITE_STATUS) {
    
 			int maxSatellites = status.getMaxSatellites();
    
 			Iterator<GpsSatellite> it = status.getSatellites().iterator();
    
 			numSatelliteList.clear();
    
 			int count = 0;
    
 			while (it.hasNext() && count <= maxSatellites) {
    
 				GpsSatellite s = it.next();
    
 				numSatelliteList.add(s);
    
 				count++;
    
 			}
    
  
    
 		}
    
 	}
    
  
    
 	private void updateToNewLocation(Location location) {
    
 		// 获取系统时间
    
 		Time t = new Time();
    
 		t.setToNow(); // 取得系统时间
    
 		int year = t.year;
    
 		int month = t.month + 1;
    
 		int date = t.monthDay;
    
 		int hour = t.hour; // 24小时制
    
 		int minute = t.minute;
    
 		int second = t.second;
    
 		TextView tv1;
    
 		tv1 = (TextView) this.findViewById(R.id.tv1);
    
 		if (location != null) {
    
 			double latitude = location.getLatitude();// 经度
    
 			double longitude = location.getLongitude();// 纬度
    
 			double altitude = location.getAltitude(); // 海拔
    
 			tv1.setText("搜索卫星个数：" + numSatelliteList.size() + "/n纬度："
    
 					+ latitude + "/n经度：" + longitude + "/n海拔：" + altitude
    
 					+ "/n时间：" + year + "年" + month + "月" + date + "日" + hour
    
 					+ ":" + minute + ":" + second);
    
  
    
 		} else {
    
  
    
 			tv1.setText("无法获取地理信息");
    
 		}
    
 	}
    
  
    
 	private final LocationListener locationListener = new LocationListener() {
    
 		public void onLocationChanged(Location location) {
    
 			// 当坐标改变时触发此函数，如果Provider传进相同的坐标，它就不会被触发
    
 			if (location != null) {
    
 				updateToNewLocation(location);
    
 				Toast.makeText(getlocation.this, "您的位置已发生改变！",
    
 						Toast.LENGTH_SHORT).show();
    
 			}
    
 		}
    
  
    
 		public void onProviderDisabled(String provider) {
    
 			// Provider被disable时触发此函数，比如GPS被关闭
    
 			updateToNewLocation(null);
    
 		}
    
  
    
 		public void onProviderEnabled(String provider) {
    
 			// Provider被enable时触发此函数，比如GPS被打开
    
 		}
    
  
    
 		public void onStatusChanged(String provider, int status, Bundle extras) {
    
 			// Provider的转态在可用、暂时不可用和无服务三个状态直接切换时触发此函数
    
 		}
    
 	};
    
  
    
 	public boolean onKeyDown(int keyCode, KeyEvent event) {
    
  
    
 		if (keyCode == KeyEvent.KEYCODE_MENU) {// 拦截menu键事件
    
 			// do something...
    
 			System.exit(0);
    
  
    
 		}
    
  
    
 		if (keyCode == KeyEvent.KEYCODE_BACK) {// 拦截返回按钮事件
    
 			// do something...
    
 			System.exit(0);
    
 		}
    
 		return true;
    
 	}
    
 }