OkHttpClient请求接口和Handler通信机制

在这里插入代码片


package com.bawei.day2test;

import android.os.Handler;
import android.os.Message;
import android.provider.SyncStateContract;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;

import com.google.gson.Gson;

import java.io.IOException;
import java.util.ArrayList;

import adapter.MyAdapter;
import base.BaseActivity;
import bean.Data;
import bean.Json;
import me.maxwin.view.XListView;
import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;

public class MainActivity extends BaseActivity {


    private XListView xListView;
    private String url="http://api.expoon.com/AppNews/getNewsList/type/1/p/1";

    @Override
    protected int layoutID() {
        return R.layout.activity_main;
    }

    @Override
    protected void initView() {
        xListView = findViewById(R.id.xlist);
    }

    @Override
    protected void initData() {
        getData();
    }

    private void getData() {
        //获取okhttp对象
        OkHttpClient okHttpClient = new OkHttpClient();
        //创建请求方式
        Request request = new Request.Builder().url(url).build();
        //执行请求
        Call call = okHttpClient.newCall(request);
        //执行异步请求
        call.enqueue(new Callback() {
            @Override
            public void onFailure(Call call, IOException e) {

            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                String string = response.body().string();
                //到这就可以打印一下试试有没有数据
                Message message = new Message();
                message.what=0;
                message.obj=string;
                handler.sendMessage(message);
            }
        });
    }
    Handler handler = new Handler(){
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
             if (msg.what==0){
                 String obj = (String) msg.obj;
                 Gson gson = new Gson();
                 Json fromJson = gson.fromJson(obj, Json.class);
                 ArrayList<Data> data = fromJson.getData();
                 //创建适配器
                 MyAdapter myAdapter = new MyAdapter(MainActivity.this, data);
                 xListView.setAdapter(myAdapter);
             }
        }
    };
}