onLocationChanged() 从未调用过

onLocationChanged() never called(onLocationChanged() 从未调用过)

问题描述

我正在编写一个带当前位置的代码，但它没有给我位置，因为它从不调用 onLocationChanged() .有没有办法找到位置.

I am writing a code that brings current location but it is not giving me the location because it never calls onLocationChanged() .Is there any way to find the location.

对于这种情况，mobileLocation 为 0，因此执行转到 else 块.

mobileLocation is coming 0 for this case, so the execution goes to the else block.

我的代码是

public class FindLocation {
private LocationManager locManager;
private LocationListener locListener;
private Location mobileLocation;
private String provider;

public FindLocation(Context ctx){
    locManager = (LocationManager) ctx.getSystemService(Context.LOCATION_SERVICE);
    locListener = new LocationListener() {
        @Override
        public void onStatusChanged(String provider, int status,
                Bundle extras) {
        }
        @Override
        public void onProviderEnabled(String provider) {
        }
        @Override
        public void onProviderDisabled(String provider) {
        }
        @Override
        public void onLocationChanged(Location location) {
            System.out.println("mobile location is in listener="+location);
            mobileLocation = location;
        }
    };
    locManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1000, 1, locListener);              
    if (mobileLocation != null) {
        locManager.removeUpdates(locListener); 
        String londitude = "Londitude: " + mobileLocation.getLongitude();
        String latitude = "Latitude: " + mobileLocation.getLatitude();
        String altitiude = "Altitiude: " + mobileLocation.getAltitude();
        String accuracy = "Accuracy: " + mobileLocation.getAccuracy();
        String time = "Time: " + mobileLocation.getTime();
        Toast.makeText(ctx, "Latitude is = "+latitude +"Longitude is ="+londitude, Toast.LENGTH_LONG).show();
    } else {
        System.out.println("in find location 4");
        Toast.makeText(ctx, "Sorry location is not determined", Toast.LENGTH_LONG).show();
    }
}
   }

推荐答案

你永远不会得到一个位置，还是只有你在评论中写的有时它会得到位置，但不是在点击时."?

Do you never get a location or only as you write in your comment "sometimes it gets location but not at the time of click."?

可能是您的代码比 LocationManager 更快，它可能尚未调用 onLocationChanged().更改您的代码以获取最后一个已知位置，或等到您的 locListener 被调用:

Might be that your code is faster than LocationManager, which might not yet have called onLocationChanged(). Change your code in order to get the last known location, or wait until your locListener was called:

locManager.requestLocationUpdates(
  LocationManager.GPS_PROVIDER, 1000, 1, locListener);
mobileLocation = locManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (mobileLocation != null) {

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