GPS_Server.java

package sjtu.com.apdetector;


import android.content.Context;
import android.content.Intent;
import android.location.Criteria;
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.util.Log;
import android.widget.Toast;

import java.util.Iterator;

/**
 * Created by jeff on 15/1/28.
 */
public class GPS_Server {
    private LocationManager lm;
    private static final String TAG = "GpsActivity";
    Location location;

    public GPS_Server(Context context) {
        lm = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
        //判断GPS是否正常启动
        if (!lm.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
//            Toast.makeText(context, "请开启GPS导航...", Toast.LENGTH_LONG).show();
            //返回开启GPS导航设置界面
//            Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
            //startActivityForResult(intent, 0);
            return;
        }

        //为获取地理位置信息时设置查询条件
        String bestProvider = lm.getBestProvider(getCriteria(), true);
//        String provider = LocationManager.NETWORK_PROVIDER;
        location = lm.getLastKnownLocation(bestProvider);
        //注意：此处更新准确度非常低，推荐在service里面启动一个Thread，在run中sleep(10000);然后执行handler.sendMessage(),更新位置
        lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1000, 1, locationListener);
        //Log.e("Location", String.valueOf(location.getLatitude()));
        //Log.e("Location", String.valueOf(location.getLongitude()));
    }

    public double get_latitude() {
        double latitude=0;
        try{
            latitude=location.getLatitude();
        }catch (Exception e){
            latitude=0;
        }
        return latitude;
    }
    public double get_longitude(){
        double longtitude=0;
        try{
            longtitude=location.getLongitude();
        }catch (Exception e){
            longtitude=0;
        }
        return longtitude;
    }

    GpsStatus.Listener listener = new GpsStatus.Listener() {
        public void onGpsStatusChanged(int event) {
            switch (event) {
                //第一次定位
                case GpsStatus.GPS_EVENT_FIRST_FIX:
                    Log.i(TAG, "第一次定位");
                    break;
                //卫星状态改变
                case GpsStatus.GPS_EVENT_SATELLITE_STATUS:
                    //获取当前状态
                    GpsStatus gpsStatus = lm.getGpsStatus(null);
                    //获取卫星颗数的默认最大值
                    int maxSatellites = gpsStatus.getMaxSatellites();
                    //创建一个迭代器保存所有卫星
                    Iterator<GpsSatellite> iters = gpsStatus.getSatellites().iterator();
                    int count = 0;
                    while (iters.hasNext() && count <= maxSatellites) {
                        GpsSatellite s = iters.next();
                        count++;
                    }
                    break;
                //定位启动
                case GpsStatus.GPS_EVENT_STARTED:
                    Log.i(TAG, "定位启动");
                    break;
                //定位结束
                case GpsStatus.GPS_EVENT_STOPPED:
                    Log.i(TAG, "定位结束");
                    break;
            }
        }

        ;
    };
    private LocationListener locationListener = new LocationListener() {

        public void onLocationChanged(Location location) {
        }
        public void onStatusChanged(String provider, int status, Bundle extras) {
        }
        public void onProviderEnabled(String provider) {
            Location location = lm.getLastKnownLocation(provider);
            //updateView(location);
        }
        public void onProviderDisabled(String provider) {
            //updateView(null);
        }


    };

    private Criteria getCriteria() {
        Criteria criteria = new Criteria();
        //设置定位精确度 Criteria.ACCURACY_COARSE比较粗略，Criteria.ACCURACY_FINE则比较精细
        criteria.setAccuracy(Criteria.ACCURACY_FINE);
        //设置是否要求速度
        criteria.setSpeedRequired(false);
        // 设置是否允许运营商收费
        criteria.setCostAllowed(false);
        //设置是否需要方位信息
        criteria.setBearingRequired(false);
        //设置是否需要海拔信息
        criteria.setAltitudeRequired(false);
        // 设置对电源的需求
        criteria.setPowerRequirement(Criteria.POWER_LOW);
        return criteria;
    }
}