为什么权限Manifest.permission.ACCESS_FINE_LOCATION未激活“位置”选项？

Question

我有一个向用户发出位置请求的代码，只要用户已经处于“位置”模式，则一切正常，但是，如果未在设备通知栏位置激活“位置”模式，返回null，我知道当我们禁用该选项时，会清除位置缓存，如何要求用户激活q的选项，然后再请求getLastLocation？

fusedLocationProviderClient.getLastLocation().addOnCompleteListener(new OnCompleteListener<Location>() {
                @Override
                public void onComplete(@NonNull Task<Location> task) {
                    localidade = task.getResult();
                    if(localidade != null){
                        try {
                            locFromLatLon = new Geocoder(AddAnuncioActivity.this, Locale.getDefault());
                            List<Address> addresses = locFromLatLon.getFromLocation(localidade.getLatitude(), localidade.getLongitude(), 1);
                            Log.i("VALORZAS", addresses.get(0).getCountryName());
                        } catch (IOException e) {
                            e.printStackTrace();
                        }
                    }else{
// Put some here whenlocation is null -- this happens when the Location option in notification bar of // user is unabled
                    }
                }
            });

仅当启用了图像中的选项时，此选项才起作用；如果禁用此选项，则getResult返回null。

我的onResume函数：

    @Override
    protected void onResume() {
        super.onResume();
        LocationRequest locationRequest = LocationRequest.create();
        locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
        locationRequest.setInterval(60000);
        locationRequest.setFastestInterval(5000);
        LocationCallback locationCallback = new LocationCallback(){
            @Override
            public void onLocationResult(LocationResult locationResult) {
                if (locationResult == null) {
                    Toast.makeText(getApplicationContext(), "Localidade ainda vazia", Toast.LENGTH_LONG).show();
                    return;
                }
                for (Location location : locationResult.getLocations()) {

                }
            }
        };
        fusedLocationProviderClient.requestLocationUpdates(locationRequest, locationCallback, null);
    }

Answer 1

您可以尝试使用LocationManager：