デバイスが既にGoogleMapsでポジションを通過しているかどうかを確認するにはどうすればよいですか？

Question

GoogleマップのLocationListenerをGoogleマップで使用しています。私のアプリケーションでは、これはユーザーが移動したルートの線を描きます。私は、ユーザーが既に行っていたポジションにいるときに警告を出したい。しかし、私のためにこれを行うサービスが存在するのかどうか、私はすべてを実装しているのかどうかはわかりません。私はジオローカライゼーションの概念を理解していません。

したがって、トレースされたルートを通過しているときに、ユーザーに警告が欲しいです。

private class FollowMeLocationSource implements LocationSource, LocationListener { 

    private OnLocationChangedListener onLocationChangedListener; 
    private LocationManager locationManager; 
    private LocationListener locationListener; 

    private final Criteria criteria = new Criteria(); 
    private String bestAvailableProvider; 

    /* Updates are restricted to one every 10 seconds, and only when 
    * movement of more than 10 meters has been detected.*/ 
    private final long minTime = 2000; 
    private final float minDistance = 5; 

    private FollowMeLocationSource() { 

     locationManager = (LocationManager) ctx.getSystemService(Context.LOCATION_SERVICE); 
     getBestAvailableProvider(); 
     // Specify Location Provider criteria 
     criteria.setAccuracy(Criteria.ACCURACY_FINE); 
     criteria.setPowerRequirement(Criteria.POWER_LOW); 
     criteria.setAltitudeRequired(true); 
     criteria.setBearingRequired(true); 
     criteria.setSpeedRequired(true); 
     criteria.setCostAllowed(true); 

     locationManager.requestLocationUpdates(bestAvailableProvider,minTime,minDistance,this); 
    } 

    private void getBestAvailableProvider() { 
     /* The preffered way of specifying the location provider (e.g. GPS, NETWORK) to use 
     * is to ask the Location Manager for the one that best satisfies our criteria. 
     * By passing the 'true' boolean we ask for the best available (enabled) provider. */ 
     bestAvailableProvider = locationManager.getBestProvider(criteria, true); 
     Log.i(TAG,"bestAvailableProvider: " + bestAvailableProvider); 
    } 

    /* Activates this provider. This provider will notify the supplied listener 
    * periodically, until you call deactivate(). 
    * This method is automatically invoked by enabling my-location layer. */ 
    @Override 
    public void activate(OnLocationChangedListener listener) { 
     Log.i(TAG,"activate"); 
     // We need to keep a reference to my-location layer's listener so we can push forward 
     // location updates to it when we receive them from Location Manager. 
     onLocationChangedListener = listener; 

     // Request location updates from Location Manager 
     if (bestAvailableProvider != null) { 
      //locationManager.requestLocationUpdates(bestAvailableProvider, minTime, minDistance, this); 
      Log.i(TAG,"activate, bestProvider != null"); 
      locationManager.requestLocationUpdates(bestAvailableProvider,minTime,minDistance,this); 
     } else { 
      Log.i(TAG,"activate, bestProvider == null"); 
      // (Display a message/dialog) No Location Providers currently available. 
     } 
    } 

    /* Deactivates this provider. 
    * This method is automatically invoked by disabling my-location layer. */ 
    @Override 
    public void deactivate() { 
     Log.i(TAG,"deactivate"); 
     // Remove location updates from Location Manager 
     locationManager.removeUpdates(this); 

     onLocationChangedListener = null; 
    } 

    @Override 
    public void onLocationChanged(Location location) { 
     Log.i(TAG,"onLocationChanged. Latitude: " + location.getLatitude() + " - Longitude: " + location.getLongitude()); 
     /* Push location updates to the registered listener.. 
     * (this ensures that my-location layer will set the blue dot at the new/received location) */ 
     if (onLocationChangedListener != null) { 
      onLocationChangedListener.onLocationChanged(location); 
     } 

     /* ..and Animate camera to center on that location ! 
     * (the reason for we created this custom Location Source !) */ 
     listaRota.add(location); 

     if (listaRota.size() == 1) { 
      mMap.addMarker(new MarkerOptions().position(new LatLng(location.getLatitude(),location.getLongitude())).title("Inicio")); 
     } 

     if (listaRota.size() >= 2) { 
      drawPolyLineOnMap(); 
     } 

     mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(location.getLatitude(), location.getLongitude()),15)); 
    } 

    @Override 
    public void onStatusChanged(String s, int i, Bundle bundle) { 
     Log.i(TAG,"onStatusChanged: " + s + ", Estado: " + i); 
    } 

    @Override 
    public void onProviderEnabled(String s) { 
     Log.i(TAG,"onProviderEnabled: " + s); 
    } 

    @Override 
    public void onProviderDisabled(String s) { 
     Log.i(TAG,"onProviderDisabled: " + s); 
    } 
} 

public void drawPolyLineOnMap() { 

    List<LatLng> list = new ArrayList<>(); 

    for(Location l : listaRota) { 
     list.add(new LatLng(l.getLatitude(),l.getLongitude())); 
    } 

    PolylineOptions polylineOptions = new PolylineOptions(); 
    polylineOptions.color(Color.BLUE); 
    polylineOptions.width(15); 
    polylineOptions.addAll(list); 

    mMap.clear(); 
    mMap.addPolyline(polylineOptions); 
} 

Answer 1

サービスはGeofence Monitoringであり（例えばthis one）を用いた実施例およびチュートリアルの多くがあること。