put Thread.Leep in the Retrofit Call method without locking the Thread UI (main)

Question

Good from what I understand the method call.enqueue(new Callback<Void>() { initiates a thread to communicate with webservice. So I thought I’d slow down the method by putting one thread.sleep(2000) to display my ProgressDialog realized that by putting the sleep did not interrupt the thead created by retrofit and yes the main Ui thread locking the ProgressDialog.

Is there any way to put one Thread.sleep within the method call.enqueue to simulate a response delay of webserver?

package com.amazongas.paulo.crudbasicandroid.dao;

import android.util.Log;

import com.amazongas.paulo.crudbasicandroid.api.ApiCallback;
import com.amazongas.paulo.crudbasicandroid.api.DataService;
import com.amazongas.paulo.crudbasicandroid.model.Contato;
import com.google.gson.Gson;

import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;

public class ContatoDao {

    public void salvar(Contato contato, final ApiCallback callback){

        Gson gson = new Gson();

        String json = gson.toJson(contato);

        DataService dataService = DataService.retrofit.create(DataService.class);

        Call<Contato> call = dataService.gravar(contato.getNome(),contato.getTelefone());

        call.enqueue(new Callback<Contato>() {
            @Override
            public void onResponse(Call<Contato> call, Response<Contato> response) {

                if(response.isSuccessful()){

                    //Simular retardo do server

                    try {
                        Thread.sleep(1000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }

                    callback.onResponse(response.body() != null);

                    //Boolean success = response.body().getSuccess();
                    int lastId = response.body().getCod();
                    Log.d("resultado","JSON: "+lastId);

                }
            }

            @Override
            public void onFailure(Call<Contato> call, Throwable t) {
                call.cancel();
                callback.onResponse(false);
                Log.d("resultado","JSON: ERROR");
            }

        });
    }
}

Answer 1

You can use the postDelayed:

Handler handler = new Handler();
handler.postDelayed(() -> salvar(contato, callback), 2000);