在Android中杀死应用程序版本7.0后如何工作后台服务

Question

公共类TrackerService扩展了服务{

private static final String TAG = TrackerService.class.getSimpleName();
private static final int MY_PERMISSIONS_REQUEST_ACCESS_FINE_LOCATION = 5445;
FusedLocationProviderClient fusedLocationProviderClient;
Firebase firebase;
String DeviceId;