问在没有服务的app被杀死后，如何在后台线程中运行代码？

EN

mainService = RetrofitClient.getInstance().getRetrofit().create(MainService.class);
        mainService.getPosts().enqueue(new Callback<List<Post>>() {
            @Override
            public void onResponse(@NotNull Call<List<Post>> call, @NotNull Response<List<Post>> response) {
                //Running on main thread

                new Thread(new Runnable() {
                    @Override
                    public void run() {
                        try {
                            Thread.sleep(10000);
                        } catch (InterruptedException e) {
                            e.printStackTrace();
                        }

                        //This code is never executed. I don't see it in the logcat.
                        Log.d(TAG, "onCreate: Background thread is still running -- " + Thread.currentThread().getName());

                    }
                }).start();
            }

            @Override
            public void onFailure(@NotNull Call<List<Post>> call, @NotNull Throwable t) {
                Log.e(TAG, "onFailure: Call failed", t);
            }
        });