OkHttp简单的请求数据

最新推荐文章于 2024-06-23 17:09:03 发布

biggrand

最新推荐文章于 2024-06-23 17:09:03 发布

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文章标签：数据 gson-工具 okhttp3

本文链接：https://blog.youkuaiyun.com/biggrand/article/details/78694194

本文介绍如何在Android应用中使用OkHttp进行网络请求，包括初始化OkHttpClient、构建请求、处理响应及JSON数据解析的过程，并展示了如何更新UI组件。

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//在Main里面，

package com.example.administrator.okhttp;

import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.widget.ListView;

import com.google.gson.Gson;

import org.json.JSONArray;
import org.json.JSONObject;

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

import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;

public class MainActivity extends AppCompatActivity {
    private ListView listView;
    private Myadp myAdapter;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        listView = findViewById(R.id.listView);
        //获取数据
        initData();
    }

private void initData() {
    //网络地址
    String url="http://api.tianapi.com/huabian/?key=5baef83129decfa305bbc140b085d8a1&num=10";
    //创建OKHttp对象
    OkHttpClient okHttpCient=new OkHttpClient();
    //创建一个Request
    Request request=new Request.Builder().url(url).build();
    //创建一个call对象
    Call call=okHttpCient.newCall(request);
    //将请求添加到调度中
    call.enqueue(new Callback() {
        @Override
        public void onFailure(Call call, IOException e) {
        }
        @Override
        public void onResponse(Call call, Response response) throws IOException {
            if(response.isSuccessful())
            {
                //获取json串
                final String message=response.body().string();
                //打印json
                System.out.println("json============="+message);
                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        //在子线程中解析json
                        getJson(message);
                    }
                });
            }
        }
    });
}

private void getJson(String result) {
    //这里需要导入一个Gson的Jar包
    Gson gson = new Gson();
    DataDataBean bean = gson.fromJson(result, DataDataBean.class);
    List<DataDataBean.NewslistBean> list = bean.getNewslist();
    for (DataDataBean.NewslistBean b : list) {
        System.out.println("bean========" + b.getTitle() + " " + b.getCtime() + " " + b.getPicUrl());
    }
    if(myAdapter==null)
    {
        myAdapter =new Myadp(list,this);
        listView.setAdapter(myAdapter);
    }
    else{
        myAdapter.notifyDataSetChanged();
    }
}
}

//适配器里
一个复用优化就可以

 if (convertView == null){
        convertView = View.inflate(context,android.R.layout.simple_list_item_1,null);
    }
    TextView textView = convertView.findViewById(android.R.id.text1);
    textView.setText(list.get(position).getTitle());
    return convertView;