JSON解析 将数据显示到ListView上

MainActivity的布局：

image.png
item_xml:
···
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">

<TextView
    android:id="@+id/text_title"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="TextView"
    android:textColor="@android:color/background_dark"
    android:textSize="25sp" />

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal">

    <TextView
        android:id="@+id/text_date"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="TextView" />

    <TextView
        android:id="@+id/text_src"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:gravity="right"
        android:text="TextView" />
</LinearLayout>

</LinearLayout>
···
首先创建联网对象，进行数据连接获取导数据，
在通过Json解析，将数据解析出来，解析出的数据保存到Map集合 中，设置到ListView中：
********具体代码如下********
*********MainActivity中*******************
···
package com.example.wangye.jsontest;

import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;

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

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

public class MainActivity extends AppCompatActivity {
ArrayList<HashMap<String,String>> arrayList = new ArrayList<>();
Button bt;
EditText ed;
ListView listView;
MyAdapter adapter;
Handler handler = new Handler(){
@Override
public void handleMessage(Message msg) {
if(msg.what == 1){
adapter = new MyAdapter(MainActivity.this,arrayList);
listView.setAdapter(adapter);
}
}
};

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    init();
}

public void init(){
    bt = (Button) findViewById(R.id.button);
    bt.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            //清空集合
            arrayList.clear();
            new Thread(){
                @Override
                public void run() {
                    getDataByNet();
                }
            }.start();

        }
    });
    ed = (EditText) findViewById(R.id.editText);
    listView = (ListView) findViewById(R.id.listview);
}

public void getDataByNet(){
    try {
        URL url = new URL("http://op.juhe.cn/onebox/news/query?q="
                +ed.getText().toString()+"&dtype=&key=477bff0267dcc1db7dfa8771c77235b2");
        HttpURLConnection con = (HttpURLConnection) url.openConnection();
        con.setRequestMethod("GET");
        con.setDoInput(true);
        con.setDoOutput(true);
        con.setConnectTimeout(10000);
        con.setReadTimeout(10000);
        con.connect();
        if(con.getResponseCode() == 200){
            InputStream is = con.getInputStream();
            ByteArrayOutputStream bs = new ByteArrayOutputStream();
            byte buffer [] = new byte[512];
            int length = -1;
            while( (length = is.read(buffer)) != -1){
                bs.write(buffer,0,length);
                bs.flush();
            }
            is.close();
            bs.close();
            parseJson(bs.toString());
        }
    } catch (Exception e) {
        e.printStackTrace();
    }
}


public void parseJson(String json){
    try {
        JSONObject jsonObject = new JSONObject(json);
        int code = jsonObject.getInt("error_code");
        if(code == 213802){
            HashMap<String,String> map = new HashMap<>();
            map.put("title","抱歉，没有搜索到相关信息...");
            map.put("pdate","");
            map.put("src","");
            arrayList.add(map);
        }else{
            JSONArray jsonArray = jsonObject.getJSONArray("result");
            for (int i = 0; i < jsonArray.length(); i++) {
                HashMap<String,String> map = new HashMap<>();
                JSONObject jo = jsonArray.getJSONObject(i);
                map.put("title",jo.getString("title"));
                map.put("pdate",jo.getString("pdate"));
                map.put("src",jo.getString("src"));
                arrayList.add(map);
            }
        }


        handler.sendEmptyMessage(1);

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

}

···
-------------MyAdapter中-------
···
package com.example.wangye.jsontest;

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.HashMap;

/**

• Created by wangye on 2018/7/9.
  */

public class MyAdapter extends BaseAdapter {
Context c;
ArrayList<HashMap<String, String>> arrayList;

public MyAdapter(Context c, ArrayList<HashMap<String, String>> arrayList) {
    this.c = c;
    this.arrayList = arrayList;
}

@Override
public int getCount() {
    return arrayList.size();
}

@Override
public Object getItem(int i) {
    return arrayList.get(i);
}

@Override
public long getItemId(int i) {
    return 0;
}

@Override
public View getView(int i, View view, ViewGroup viewGroup) {
    view = View.inflate(c,R.layout.adapter,null);
    TextView txTitle = view.findViewById(R.id.text_title);
    txTitle.setText(arrayList.get(i).get("title"));
    TextView txDate = view.findViewById(R.id.text_date);
    txDate.setText(arrayList.get(i).get("pdate"));
    TextView txSrc = view.findViewById(R.id.text_src);
    txSrc.setText(arrayList.get(i).get("src"));
    return view;
}

}

···
效果图：

image.png
image.png