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

Question

我有一个为用户发出位置请求的代码，只要用户已经处于“位置”模式，一切正常，但是，如果“位置”模式未在设备通知栏中激活location 返回 null，我知道当我们禁用该选项时，位置缓存被清除，我怎么能要求用户激活 q 的选项然后我请求 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
                    }
                }
            });

这仅在图像中的选项启用时才有效，如果此选项关闭，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

你可以试试LocationManager:

final LocationManager manager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);

if (!manager.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
    //Call Alert or use android.provider.Settings.ACTION_LOCATION_SOURCE_SETTINGS

}

参考Documentation