我有一个地图活动，它必须使用myLocationOverlay在地图上显示我的当前位置，我从服务中获取位置。
这是我的活动：
public class ShowMapActivity extends MapActivity {
private MapController mapController;
private MapView mapView;
private LocationManager locationManager;
private MyOverlayUtility itemizedoverlay;
private MyLocationOverlay myLocationOverlay;
private double latitude;
private double longitude;
public void onCreate(Bundle bundle) {
super.onCreate(bundle);
setContentView(R.layout.activity_showmap);
Intent serviceIntent = new Intent(this, LocationService.class);
serviceIntent.setAction("startListening");
startService(new Intent(this, LocationService.class));
// check if the GPS is on
// isGPSEnable();
IntentFilter filter = new IntentFilter();
filter.addAction(UPDATE_MAP);
registerReceiver(updateReceiver, filter);
// Configure the Map
mapView = (MapView) findViewById(R.id.mapview);
mapView.setBuiltInZoomControls(true);
mapView.setSatellite(true);
mapController = mapView.getController();
mapController.setZoom(14);
myLocationOverlay = new MyLocationOverlay(this, mapView);
myLocationOverlay.runOnFirstFix(new Runnable() {
public void run() {
mapView.getController().animateTo(
myLocationOverlay.getMyLocation());
}
});
}
@Override
protected boolean isRouteDisplayed() {
return true;
}
private final String UPDATE_MAP = "com.livetrekker.activities.UPDTAE_LOCATION";
private BroadcastReceiver updateReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
longitude = intent.getDoubleExtra("long", 0);
latitude = intent.getDoubleExtra("lat", 0);
Log.e("LOCATION", "lat = " + latitude + " long = " + longitude);
}
};}
这是我的服务：
public class LocationService extends Service implements LocationListener {
private final String UPDATE_MAP = "com.livetrekker.activities.UPDTAE_LOCATION";
private LocationManager locationManager;
private String provider;
private Location location;
@Override
public int onStartCommand(final Intent intent, final int flags,
final int startId) {
Log.e("Service", "start location");
// if (intent.getAction().equals("startListening")) {
locationManager = (LocationManager) this
.getSystemService(Context.LOCATION_SERVICE);
Criteria criteria = new Criteria();
provider = locationManager.getBestProvider(criteria, false);
Location location = locationManager.getLastKnownLocation(provider);
if (location != null) {
Log.e("LOCATION", "Provider " + provider + " has been selected");
onLocationChanged(location);
}
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0,
0, this);
// }
/*
* else { if (intent.getAction().equals("stopListening")) {
* locationManager.removeUpdates(this); locationManager = null; } }
*/
return START_STICKY;
}
@Override
public IBinder onBind(final Intent intent) {
return null;
}
@Override
public void onLocationChanged(final Location location) {
this.location = location;
double lng = location.getLongitude();
double lat = location.getLatitude();
Log.e("SERVICELOCATION", "lat : " + lat + " lng : " + lng);
Intent updateIntent = new Intent();
updateIntent.putExtra("long", lng);
updateIntent.putExtra("lat", lat);
updateIntent.setAction(UPDATE_MAP);
getApplicationContext().sendBroadcast(updateIntent);
}
public void onProviderDisabled(final String provider) {
}
public void onProviderEnabled(final String provider) {
}
public void onStatusChanged(final String arg0, final int arg1,
final Bundle arg2) {
}}
所以位置管理器工作正常，我能够在我的活动中获取我的纬度和经度，但 myLocationOverlay 没有显示。
那么是否可以使用这种方式在地图上显示我当前的位置？
谢谢
编辑：
我修复了更换问题
myLocationOverlay = new MyLocationOverlay(this, mapView);
myLocationOverlay.runOnFirstFix(new Runnable() {
public void run() {
mapView.getController().animateTo(
myLocationOverlay.getMyLocation());
}
});
由：
List overlays = mapView.getOverlays();
MyLocationOverlay myLocationOverlay = new MyLocationOverlay(this, mapView);
myLocationOverlay.enableMyLocation();
overlays.add(myLocationOverlay);
遵循以下代码：
public class GoogleMapsActivity extends MapActivity {
public static final String TAG = "GoogleMapsActivity";
private MapView mapView;
private LocationManager locationManager;
Geocoder geocoder;
Location location;
LocationListener locationListener;
CountDownTimer locationtimer;
MapController mapController;
MapOverlay mapOverlay = new MapOverlay();
@Override
protected void onCreate(Bundle icicle) {
super.onCreate(icicle);
setContentView(R.layout.googlemap);
initComponents();
mapView.setBuiltInZoomControls(true);
mapView.setSatellite(true);
mapController = mapView.getController();
mapController.setZoom(16);
locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
if (locationManager == null) {
Toast.makeText(GoogleMapsActivity.this,
"Location Manager Not Available", Toast.LENGTH_SHORT)
.show();
return;
}
location = locationManager
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location == null)
location = locationManager
.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (location != null) {
double lat = location.getLatitude();
double lng = location.getLongitude();
Toast.makeText(GoogleMapsActivity.this,
"Location Are" + lat + ":" + lng, Toast.LENGTH_SHORT)
.show();
GeoPoint point = new GeoPoint((int) (lat * 1E6), (int) (lng * 1E6));
mapController.animateTo(point, new Message());
mapOverlay.setPointToDraw(point);
List<Overlay> listOfOverlays = mapView.getOverlays();
listOfOverlays.clear();
listOfOverlays.add(mapOverlay);
}
locationListener = new LocationListener() {
@Override
public void onStatusChanged(String arg0, int arg1, Bundle arg2) {
}
@Override
public void onProviderEnabled(String arg0) {
}
@Override
public void onProviderDisabled(String arg0) {
}
@Override
public void onLocationChanged(Location l) {
location = l;
locationManager.removeUpdates(this);
if (l.getLatitude() == 0 || l.getLongitude() == 0) {
} else {
double lat = l.getLatitude();
double lng = l.getLongitude();
Toast.makeText(GoogleMapsActivity.this,
"Location Are" + lat + ":" + lng,
Toast.LENGTH_SHORT).show();
}
}
};
if (locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER))
locationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER, 1000, 10f, locationListener);
locationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER, 1000, 10f, locationListener);
locationtimer = new CountDownTimer(30000, 5000) {
@Override
public void onTick(long millisUntilFinished) {
if (location != null)
locationtimer.cancel();
}
@Override
public void onFinish() {
if (location == null) {
}
}
};
locationtimer.start();
}
public MapView getMapView() {
return this.mapView;
}
private void initComponents() {
mapView = (MapView) findViewById(R.id.googleMapview);
}
@Override
protected boolean isRouteDisplayed() {
return false;
}
class MapOverlay extends Overlay {
private GeoPoint pointToDraw;
public void setPointToDraw(GeoPoint point) {
pointToDraw = point;
}
public GeoPoint getPointToDraw() {
return pointToDraw;
}
@Override
public boolean draw(Canvas canvas, MapView mapView, boolean shadow,
long when) {
super.draw(canvas, mapView, shadow);
Point screenPts = new Point();
mapView.getProjection().toPixels(pointToDraw, screenPts);
Bitmap bmp = BitmapFactory.decodeResource(getResources(),
R.drawable.pingreen);
canvas.drawBitmap(bmp, screenPts.x, screenPts.y - 24, null);
return true;
}
}
}
（或）点击此链接：http://www.javacodegeeks.com/2011/02/android-google-maps-tutorial.html