Android：即使找到困难的位置，Mapview 中的位置更新也需要很长时间
我在 MapView 应用程序中的位置侦听器有问题。 特别是时间上有一个问题，我的实际位置将被绘制在地图上。
我将两个侦听器附加到我的 MapView。第一个等待来自网络的信号，第二个等待来自 GPS 的信号。在侦听器实现开始时，我获取最后已知位置以减少其他提供者搜索位置的时间。
我在 MapView 中的 LocationListner 的调用方式如下：
public void locationManager(){
mLocationUpdateHandlerGPS = new LocationUpdateHandler();
mLocationUpdateHandlerNetwork = new LocationUpdateHandler();
mLocationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
//-------Check if Network is available-----
mLocationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, mLocationUpdateHandlerNetwork);
//-------Check if GPS is available---------
mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 500, 1, mLocationUpdateHandlerGPS);
}
我实现监听器的 LocationUpdateHandler.class 如下所示：
public class LocationUpdateHandler implements LocationListener {
@Override
public void onLocationChanged(Location location) {
location = mLocationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
int lat = (int) (location.getLatitude() * 1E6);
int lng = (int) (location.getLongitude() * 1E6);
//Log Actual Position
Log.v(TAG, "Actual Postion // Get Latitude: " + lat);
Log.v(TAG, "Actual Postion // Get Longitude: " + lng);
mMyLocationOverlay.enableMyLocation();
Log.v(TAG, "Enable Location returns: "+mMyLocationOverlay.enableMyLocation());
mMyLocationOverlay.runOnFirstFix(new Runnable() {
@Override
public void run() {
mMapView.getController().animateTo(
mMyLocationOverlay.getMyLocation());
}
});
}
}
地图启动后，我检查 DDMS 的日志输出，可以看到位置已及时获取。
08-29 14:50:16.136: VERBOSE/GeoTagMapActivity(7300): Running Activity GeoTagMapActivity
08-29 14:50:20.691: VERBOSE/GeoTagMapActivity(7300): Enable Location returns: true
08-29 14:50:20.691: VERBOSE/GeoTagMapActivity(7300): Actual Postion // Get Latitude: *******
08-29 14:50:20.691: VERBOSE/GeoTagMapActivity(7300): Actual Postion // Get Longitude: *******
尽管如此，我还需要 2 - 5 分钟才能在地图上绘制位置。
我不知道问题出在哪里。 感谢您的帮助！
I have a problem with my Location Listener in a MapView Application.
Especially there is a Problem with the time, my actual Position will be painted on a Map.
I attached two listeners to my MapView. The first one waits for a signal from the Network and the second one from the GPS. At the beginning of the Listener Implementation I get the Last Known Location to reduce the Time while other providers search a position.
My LocationListner in the MapView is called as followed:
public void locationManager(){
mLocationUpdateHandlerGPS = new LocationUpdateHandler();
mLocationUpdateHandlerNetwork = new LocationUpdateHandler();
mLocationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
//-------Check if Network is available-----
mLocationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, mLocationUpdateHandlerNetwork);
//-------Check if GPS is available---------
mLocationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 500, 1, mLocationUpdateHandlerGPS);
}
The LocationUpdateHandler.class where i implemented the Listener looks like this:
public class LocationUpdateHandler implements LocationListener {
@Override
public void onLocationChanged(Location location) {
location = mLocationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
int lat = (int) (location.getLatitude() * 1E6);
int lng = (int) (location.getLongitude() * 1E6);
//Log Actual Position
Log.v(TAG, "Actual Postion // Get Latitude: " + lat);
Log.v(TAG, "Actual Postion // Get Longitude: " + lng);
mMyLocationOverlay.enableMyLocation();
Log.v(TAG, "Enable Location returns: "+mMyLocationOverlay.enableMyLocation());
mMyLocationOverlay.runOnFirstFix(new Runnable() {
@Override
public void run() {
mMapView.getController().animateTo(
mMyLocationOverlay.getMyLocation());
}
});
}
}
After the Map starts i check the Log Output from the DDMS and can see that the Location is get in Time.
08-29 14:50:16.136: VERBOSE/GeoTagMapActivity(7300): Running Activity GeoTagMapActivity
08-29 14:50:20.691: VERBOSE/GeoTagMapActivity(7300): Enable Location returns: true
08-29 14:50:20.691: VERBOSE/GeoTagMapActivity(7300): Actual Postion // Get Latitude: *******
08-29 14:50:20.691: VERBOSE/GeoTagMapActivity(7300): Actual Postion // Get Longitude: *******
Nevertheless i takes another 2 - 5 minutes until the Position will drawn on the Map.
I have no idea where's the Problem.
Thanks for your help!
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MyLocationOverlay< /code>是 Android 版 Google 地图的辅助类。它自己进行位置获取，更具体地说，它使用 GPS 来获取位置。由于您调用了 runOnFirstFix(runnable) ，因此它会在执行代码之前等待获得 GPS 修复。有时（尤其是在室内）这可能需要几分钟的时间。因此延迟了。也完全有可能获取基于网络的位置，但不能获取 GPS 位置（尤其是在室内），因此在这种情况下，您的代码将永远不会被执行（除非
MyLocationOverlay在超时后回退到网络提供商 - 这没有任何地方解释）。您在日志中看到的位置是您通过网络位置提供商（wifi 和蜂窝网络位置）获取的位置。
只需按照 @user370305 在评论中建议的那样删除
runOnFirstFix()即可。MyLocationOverlayis a helper class of Google Maps for Android. It does it's own location acquiring, more specifically it uses GPS to do it.Since you call
runOnFirstFix(runnable)it waits to get a GPS fix before executing your code. This can sometimes (especially indoor) take minutes. Hence the delay. It's also entirely possible to acquire network-based location, but not GPS position (especially indoors), so in this case your code would never be executed (except ifMyLocationOverlayfalls back to network provider after timeout - this isn't explained anywhere).The position that you see in the logs are positions that you acquire via network location provider (wifi and cell network locations).
Just remove
runOnFirstFix()as @user370305 suggested in comments.