android json解析

最新推荐文章于 2025-11-26 18:40:17 发布

原创最新推荐文章于 2025-11-26 18:40:17 发布 · 177 阅读

0 ·

CC 4.0 BY-SA版权

文章标签：

#json #json解析

android json 专栏收录该内容

2 篇文章

订阅专栏

本文介绍了一个简单的Android应用程序，该程序通过HTTP请求获取JSON数据，并使用多线程进行数据解析和UI更新。主要实现了从指定URL下载JSON文件，然后解析其中的数据，并在界面上展示。

MainActivity.java


package com.json.test_02;

import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

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

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener{

	private Button button;
	private MyHandler handler;

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

        button=(Button) findViewById(R.id.button1);
        button.setOnClickListener(this);

        handler=new MyHandler();
    }

	@Override
	public void onClick(View v) {
		// TODO Auto-generated method stub
		if(v.getId()==R.id.button1){
			MyThread thread=new MyThread();
			thread.start();
		}
	}

	public String readData(InputStream inSream, String charsetName)
			throws Exception {
		ByteArrayOutputStream outStream = new ByteArrayOutputStream();
		byte[] buffer = new byte[1024];
		int len = -1;
		while ((len = inSream.read(buffer)) != -1) {
			outStream.write(buffer, 0, len);
		}
		byte[] data = outStream.toByteArray();
		outStream.close();
		inSream.close();
		return new String(data, charsetName);
	}

	class MyThread extends Thread{
		@Override
		public void run() {
			try {
				URL url=new URL("http://192.168.43.78:8080/MyWeb_Json/myjson.json");
				HttpURLConnection conn= (HttpURLConnection) url.openConnection();

				InputStream input=conn.getInputStream();
				String str=readData(input,"utf-8");

				JSONArray array=new JSONArray(str);
				for (int i = 0; i < array.length(); i++) {
					JSONObject jobj=array.getJSONObject(i);
					int id=jobj.getInt("id");
					String name=jobj.getString("name");

					Message message=new Message();
					Bundle data=new Bundle();
					data.putInt("id", id);
					data.putString("name", name);
					message.setData(data);

					handler.sendMessage(message);
					System.out.println(id+"---------"+name);

				}

			} catch (Exception e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}

		}
	}
	class MyHandler extends Handler{

		@Override
		public void handleMessage(Message msg) {
			// TODO Auto-generated method stub
			Bundle data=msg.getData();
			int id=data.getInt("id");
			String name=data.getString("name");

			Toast.makeText(MainActivity.this, "id:"+id+"name:"+name, Toast.LENGTH_SHORT).show();
		}

	}

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }

}

manifest.xml


    <uses-permission android:name="android.permission.INTERNET"/>