Android使用GPS

Android的gps服务，主要有两个类LocationManager和LocationProvider。LocationManager与android底层交互，提供系统位置的访问方法，LocationProvider定义位置服务的提供方法，gps、network或者passive。下面是个简单的例子：
package com.yeetrack.android.mygps;import java.io.IOException;import java.util.List;import java.util.Locale;import android.location.Address;import android.location.Criteria;import android.location.Geocoder;import android.location.Location;import android.location.LocationListener;import android.location.LocationManager;import android.os.Bundle;import android.widget.TextView;import android.app.Activity;import android.content.Context;public class MainActivity extends Activity{    private TextView locationView;    private LocationManager locationManager;    @Override    protected void onCreate(Bundle savedInstanceState)    {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        //使用Geocoder实现地址位置和经纬度之间的转化        Geocoder geocoder = new Geocoder(this, Locale.getDefault());        locationView = (TextView)findViewById(R.id.locationId);        locationManager = (LocationManager)getSystemService(Context.LOCATION_SERVICE);        StringBuilder stringBuilder = new StringBuilder("可利用的provider");        //providers有gps，network和passive。gps最精确，network是通过网络定位，不太精确，passive是被动接受推送        List<String> providers = locationManager.getProviders(true);         //位置变化监听接口        LocationListener locationListener = new LocationListener()        {            @Override            public void onStatusChanged(String provider, int status, Bundle extras)            {                // TODO Auto-generated method stub            }            @Override            public void onProviderEnabled(String provider)            {                // TODO Auto-generated method stub            }            @Override            public void onProviderDisabled(String provider)            {                // TODO Auto-generated method stub            }            @Override            public void onLocationChanged(Location location)            {                /**                 * 这里进行位置变化的一些操作                 */                System.out.println("位置改变了");            }        };        for(String provider : providers)        {            locationManager.requestLocationUpdates(provider, 0, 1000, locationListener);            stringBuilder.append("\n"+provider).append(":");            Location location = locationManager.getLastKnownLocation(provider);            if(location != null)            {                //经度                double lat = location.getLatitude();                //纬度                double lng = location.getLongitude();                double altitute = location.getAltitude();                stringBuilder.append("(");                stringBuilder.append(lat);                stringBuilder.append(",");                stringBuilder.append(lng);                stringBuilder.append(",高度"+altitute);                stringBuilder.append(",速度"+location.getSpeed());                stringBuilder.append(",方向"+location.getBearing());                stringBuilder.append(")");                //再将经纬度转化为地名                try                {                    List<Address> addresses = geocoder.getFromLocation(lat, lng, 1);                    Address add = addresses.get(0);                    for(int i=0;i<=add.getMaxAddressLineIndex();i++)                        System.out.println(add.getAddressLine(i));                } catch (IOException e)                {                    // TODO Auto-generated catch block                    e.printStackTrace();                }            }            else                stringBuilder.append("null");        }        //设置过滤条件        Criteria criteria = new Criteria();        //设置精确度        criteria.setAccuracy(Criteria.ACCURACY_FINE);        //设置耗电度        criteria.setPowerRequirement(Criteria.POWER_HIGH);        //是否需要高度信息        criteria.setAltitudeRequired(true);        //是否需要方位信息        criteria.setBearingRequired(true);        //方位经度        criteria.setBearingAccuracy(Criteria.ACCURACY_HIGH);        //是否需要速度信息        criteria.setSpeedRequired(true);        //速度经度        criteria.setSpeedAccuracy(Criteria.ACCURACY_HIGH);        //是否产生费用        criteria.setCostAllowed(true);        //获取符合条件的location provider        String bestProvider = locationManager.getBestProvider(criteria, true);        System.out.println(bestProvider);        List<String> matchProviders = locationManager.getProviders(false);        for(String index : matchProviders)            System.out.println(index);        //已知地名，获取该点的坐标等信息        String address = "北京天安门";        try        {            List<Address> addresses  = geocoder.getFromLocationName(address, 5);            if(addresses.size()!=0)            {                for(Address index : addresses)                {                    System.out.println("+++");                    System.out.println(index.getLatitude());                    System.out.println(index.getLongitude());                }            }        } catch (IOException e)        {            // TODO Auto-generated catch block            e.printStackTrace();        }        locationView.setText(stringBuilder);    }}
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