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();
}
}
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