JSON转listview中

这个是我做的电子书阅读器其中的一个测试页面 

也没有去加图片什么的 

JSON 字符串格式

[
{"idd":"50736","id":"19147735","lx":"Ebook","mc":"冷笑话","dx":"32.74","rq":"2020-04-17"},
{"idd":"50735","id":"70347734","lx":"Ebook","mc":"九阳神功","dx":"2443.37","rq":"2020-04-17"},
{"idd":"50734","id":"64147733","lx":"Ebook","mc":"神魔九变","dx":"2784.28","rq":"2020-04-17"},
{"idd":"50733","id":"58147732","lx":"Ebook","mc":"神墓","dx":"6109.03","rq":"2020-04-17"},
{"idd":"50732","id":"37947731","lx":"Ebook","mc":"极品无赖","dx":"1757.93","rq":"2020-04-17"},
{"idd":"50731","id":"17047730","lx":"Ebook","mc":"凌天传说","dx":"4909.78","rq":"2020-04-17"},
{"idd":"50730","id":"44047729","lx":"Ebook","mc":"花间曲","dx":"1914.91","rq":"2020-04-17"}
]

list_item.xml（这里面TV4我保存书名的序列号 不想让用户看到 设置成隐藏了）

<?xml version="1.0" encoding="UTF-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    >
    <TextView
        android:id="@+id/tv1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="18sp"
        android:text="111222333"

        />
    <TextView
        android:id="@+id/tv2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="18sp"
        android:text=" 111333222"
        android:layout_toRightOf="@id/tv1"
        />

    <TextView
        android:id="@+id/tv3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="18sp"
        android:text=" 999-111"
        android:layout_below="@id/tv2"
        android:layout_toRightOf="@id/tv1"
        />
    <TextView
        android:id="@+id/tv4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="18sp"
        android:text=" 999-11www1"
        android:layout_below="@id/tv2"
        android:layout_toRightOf="@id/tv3"
        android:visibility="invisible"
        />
</RelativeLayout>

MainActivity

package com.jinesc.http;
import android.os.Handler;
import android.os.Message;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.TextView;

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

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import java.util.HashMap;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    public static final int SHOW_RESPONSE=0;//用于更新操作
    private Button sendRequest;
    private ListView lv;
    private String JSONstr;

    //用于处理和发送消息的Hander
    private Handler handler=new Handler(){
        public void handleMessage(Message msg){
            //如果返现msg.what=SHOW_RESPONSE，则进行制定操作，如想进行其他操作，则在子线程里将SHOW_RESPONSE改变
            switch (msg.what){
                case SHOW_RESPONSE:
                    String response=(String)msg.obj;
                    //进行UI操作，将结果赋值到JSONSTR
                    JSONstr=response;
            }
        }
    };


    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //sendRequest=(Button)findViewById(R.id.send_request);
        //responseText=(TextView)findViewById(R.id.response_text);
        //sendRequest.setOnClickListener(this);

        sendRequestWithHttpURLConnection(); //读取数据

        lv = (ListView) findViewById(R.id.list_view);

        lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,long arg3) {
                TextView tt= arg0.getChildAt(arg2).findViewById(R.id.tv4); //获得listview中TV4 TEXTVIEW

                setTitle("第"+arg2+"行"+tt.getText().toString());//设置标题栏显示点击的行
            }
        });
    }


    @Override    public void onClick(View v) {
        if(v.getId()==R.id.tolistv){
            sendRequestWithHttpURLConnection(); //读取数据
            lv = (ListView) findViewById(R.id.list_view);
            /*定义一个动态数组*/
            ArrayList<HashMap<String, Object>> listItem = new ArrayList<HashMap<String,     Object>>();
            /*在数组中存放数据*/

            JSONArray jsonArray = null;
            try {
                jsonArray = new JSONArray(JSONstr);
                for (int i = 0; i < jsonArray.length(); i++) {
                    JSONObject jsonObject = jsonArray.getJSONObject(i);
                    String mc = jsonObject.getString("mc");
                    String lx = jsonObject.getString("lx");
                    String dx = jsonObject.getString("dx");
                    String idd = jsonObject.getString("idd");
                    HashMap<String, Object> map = new HashMap<String, Object>();

                    map.put("mc", mc+"  ");
                    map.put("lx", lx+">>");
                    map.put("dx", dx+"KB   ");
                    map.put("idd", idd);
                    listItem.add(map);

                }

            } catch (JSONException e) {
                e.printStackTrace();
            }


            SimpleAdapter mSimpleAdapter = new SimpleAdapter(this,listItem,//需要绑定的数据
                    R.layout.list_item,//每一行的布局
                    //动态数组中的数据源的键对应到定义布局的View中
                    new String[] {"lx","mc", "dx","idd"},
                    new int[] {R.id.tv1,R.id.tv2,R.id.tv3,R.id.tv4});
            lv.setAdapter(mSimpleAdapter);//为ListView绑定适配器

        }

    }
    private void sendRequestWithHttpURLConnection(){
        //开启线程来发起网络请求
        new Thread(new Runnable() {
            @Override
            public void run() {
                HttpURLConnection connection=null;
                try{
                    URL url=new URL("这里是网址内容 已经隐藏了！！！");
                    connection=(HttpURLConnection)url.openConnection();
                    connection.setRequestMethod("GET");
                    connection.setConnectTimeout(8000);
                    connection.setReadTimeout(8000);

                    InputStream in=connection.getInputStream();
                    //下面对获取到的输入流进行读取
                    BufferedReader bufr=new BufferedReader(new InputStreamReader(in));
                    StringBuilder response=new StringBuilder();
                    String line=null;
                    while((line=bufr.readLine())!=null){
                        response.append(line);
                    }

                    Message message=new Message();
                    message.what=SHOW_RESPONSE;
                    //将服务器返回的数据存放到Message中
                    message.obj=response.toString();
                    handler.sendMessage(message);
                }catch(Exception e){
                    e.printStackTrace();
                }finally {
                    if(connection!=null){
                        connection.disconnect();
                    }
                }
            }
        }).start();
    }
}