Android Geofencing

Question

我已经阅读了Geofencing的教程,我有一个问题.

地理围栏是否要求您持续监控用户的位置？

或者,当转换已经确定时,您添加Geofence 的LocationClient会自动触发吗？

这似乎是一个显而易见的问题,但教程从未提及有关从位置管理器请求位置更新的任何内容.

Answer 1

        public class MainActivity extends FragmentActivity implements
          OnMarkerDragListener {

         private GoogleMap googleMap;
         private int distance;
         private SupportMapFragment mapFragment;

         @Override
         public void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.activity_main);
          SupportMapFragment mapFragment = ((SupportMapFragment) getSupportFragmentManager()
            .findFragmentById(R.id.map));
          googleMap = mapFragment.getMap();
          googleMap.setOnMarkerDragListener(this);
          distance = 100;
          googleMap.moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(
            26.788707, 75.828108), 15));
          createGeofence(26.788707, 75.828108, distance, "CIRCLE", "GEOFENCE");
         }
         private void createGeofence(double latitude, double longitude, int radius,
           String geofenceType, String title) {

          Marker stopMarker = googleMap.addMarker(new MarkerOptions()
            .draggable(true)
            .position(new LatLng(latitude, longitude))
            .title(title)
            .icon(BitmapDescriptorFactory
              .fromResource(R.drawable.stop_marker)));

          googleMap.addCircle(new CircleOptions()
            .center(new LatLng(latitude, longitude)).radius(radius)
            .fillColor(Color.parseColor("#B2A9F6"))); 
         }
         @Override
         public void onMarkerDrag(Marker marker) {
         }
         @Override
         public void onMarkerDragEnd(Marker marker) {
          LatLng dragPosition = marker.getPosition();
          double dragLat = dragPosition.latitude;
          double dragLong = dragPosition.longitude;
          googleMap.clear();
          createGeofence(dragLat, dragLong, distance, "CIRCLE", "GEOFENCE");
          Toast.makeText(
            MainActivity.this,
            "onMarkerDragEnd dragLat :" + dragLat + " dragLong :"
              + dragLong, Toast.LENGTH_SHORT).show();
          Log.i("info", "on drag end :" + dragLat + " dragLong :" + dragLong);

         }
         @Override
         public void onMarkerDragStart(Marker marker) {
         }



   main .xml 

    < ?xml version="1.0" encoding="utf-8"?>
     < RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >

        < fragment
            android:id="@+id/map"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            class="com.google.android.gms.maps.SupportMapFragment" />
    < /RelativeLayout>