我正在使用LocationListener GoogleMaps API来处理地图。在我的应用程序中，这绘制了用户行进的路线。我想在用户处于他们去过的位置时设置警报。但我不知道是否存在为我这样做的服务，或者我是否拥有所有的工具。我不明白地理定位的概念。
因此，当用户通过跟踪的路线时，我希望提醒用户。
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);
}