android-用户定位-<十五>

1.User Location

• 获取用户的位置
• 追踪用户的移动

2.User Location的API

   1.LocationManager  :用于管理android的用户定位服务

   2.LocationProvider :提供多种定位方式给开发者选择

   3.LocationListener : 监听位置是否改变，provider是否可用或改变等信息

4.LocationProvider(定位方式的分类)
   1.GPS定位：

     使用GPS卫星进行定位，需要在清单文件中添加权限：android.permission.ACCESS_FINE_LOCATION

   2.NetWork定位：

     使用信号接收塔和WI-FI介入点进行定位，需要在清单文件中添加权限：上面那个(推荐)或

     android.permission.ACCESS_COARSE_LOCATION

3.LocationManager类

   构造方法：Activity.this.getSystemService(LOCATION_SERVICE);

   静态成员变量：String   provider="GPS_PROVIDER";//Name of the GPS location provider

                       String   provider="NETWORK_PROVIDER";//Name of the network location provider

5.代码步骤

     1.在清单文件中添加权限：android.permission.ACCESS_FINE_LOCATION

     2.获取LocationManager对象：

          LocationManager locationManager = (LocationManager)MainActivity.this.getSystemService(Context.LOCATION_SERVICE);

     3.选择LocationProvider：

          locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, new LocationListener());

     4.绑定LocationListener对象：

            LocationListener接口：

                                onLocationChanged(Location location);

                                onProviderDisabled(String provider);

                                onProviderEnabled(String provider);

                                onStatusChanged(String provider, int status, Bundle extras) ;

public class MainActivity extends Activity {
    /** Called when the activity is first created. */
    private Button button = null;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        button = (Button)findViewById(R.id.locationButtonId);
        button.setOnClickListener(new ButtonListener());
    }
    
    
    private class ButtonListener implements OnClickListener{

        @Override
        public void onClick(View v) {
            //得到LocationManager对象
            LocationManager locationManager = (LocationManager)MainActivity.this.getSystemService(Context.LOCATION_SERVICE);
            //1.定义当前所使用的Location Provider
            locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, new TestLocationListener());
        }
    }
    
    private class TestLocationListener implements LocationListener{

        @Override
        public void onLocationChanged(Location location) {
            // TODO Auto-generated method stub
            System.out.println(location.getLongitude());
            System.out.println(location.getLatitude());
        }

        @Override
        public void onProviderDisabled(String provider) {
            // TODO Auto-generated method stub
            
        }

        @Override
        public void onProviderEnabled(String provider) {
            // TODO Auto-generated method stub
            
        }

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

6.Criteria

 

//生成一个Criteria对象
            Criteria criteria = new Criteria();
            //设置查询条件
            criteria.setAccuracy(Criteria.ACCURACY_FINE);
            criteria.setPowerRequirement(Criteria.POWER_LOW);
            criteria.setAltitudeRequired(false);
            criteria.setSpeedRequired(false);
            criteria.setCostAllowed(false);
            //false是指不能该provider是否已启用都返回出来
            String provider = locationManager.getBestProvider(criteria, false);

7.