onLocationChanged沒有被調用

Question

我想在地圖上顯示當前位置，但onLocationChanged沒有被調用。

@Override 
public void onLocationChanged(Location location) { 
    Log.d("Called", "onLocationChanged"); 
    LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude()); 
    MarkerOptions markerOptions = new MarkerOptions(); 
    markerOptions.position(latLng); 
    markerOptions.title("Current Position"); 
    markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_MAGENTA)); 
    mMap.addMarker(markerOptions); 
    mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng)); 
    mMap.animateCamera(CameraUpdateFactory.zoomTo(11)); 
} 

這裏是我的onCreate代碼

LocationManager lm = (LocationManager) getSystemService(Context.LOCATION_SERVICE); 
lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 1000, 0, this); 

Answer 1

你們有這兩種權限

requestPermissions({ 
     android.Manifest.permission.ACCESS_FINE_LOCATION, 
     android.Manifest.permission.ACCESS_COARSE_LOCATION, 
    }, REQUESTPERM); 

，並覆蓋onRequestPermissionsResult處理批/拒絕？

@Override 
    public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {}