Android applet used to check network and network speed

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
  
public class MainActivity extends Activity {
    private MyHandler handler;
    private Map<String, String> urlMap;
    private Map<String, Integer> idMap;
  
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
  
        // final Map<String, String> urlMap = new HashMap<String, String>();
        urlMap = new HashMap<String, String>();
        urlMap.put("tv_q", "http://xw.qq.com/");
        urlMap.put("tv_taobao", "http://m.taobao.com/");
        urlMap.put("tv_baidu", "http://m.baidu.com/");
        urlMap.put("tv_sina", "http://sina.cn/");
        urlMap.put("tv_google", "http://www.google.com.hk/");
        urlMap.put("tv_apple", "http://www.apple.com/");
  
        idMap = new HashMap<String, Integer>();
        idMap.put("tv_q", R.id.tv_q);
        idMap.put("tv_taobao", R.id.tv_taobao);
        idMap.put("tv_baidu", R.id.tv_baidu);
        idMap.put("tv_sina", R.id.tv_sina);
        idMap.put("tv_google", R.id.tv_google);
        idMap.put("tv_apple", R.id.tv_apple);
        Button button = (Button) findViewById(R.id.button1);
        handler = new MyHandler();
  
        // 设置监听
        button.setOnClickListener(new Button.OnClickListener() {
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                Iterator<Entry<String, String>> it = urlMap.entrySet()
                        .iterator();
                while (it.hasNext()) {
                    String speed = "正在检测..";
                    Entry<String, String> e = it.next();
                    String id = e.getKey();
                    String url = e.getValue();
                    TextView tv = (TextView) MainActivity.this
                            .findViewById(idMap.get(id));
                    tv.setText(speed);
                }
  
                new MyThread().start();
            }
        });
    }
  
    class MyHandler extends Handler {
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            TextView tv = (TextView) findViewById(msg.what);
            tv.setText(msg.getData().getString("speed"));
        }
    }
  
    class MyThread extends Thread {
        @Override
        public void run() {
            Iterator<Entry<String, String>> it = urlMap.entrySet().iterator();
            while (it.hasNext()) {
                String speed = "访问失败";
                Entry<String, String> e = it.next();
                String id = e.getKey();
                String url = e.getValue();
                long time = 0;
                String result = "";
                try {
                    long start = System.currentTimeMillis();
                    Document doc = Jsoup.connect(url).get();
                    long end = System.currentTimeMillis();
                    time = end - start;
                    result = doc.body().html();
                } catch (Exception ex) {
                    ex.printStackTrace();
                }
                if (result.length() > 0) {
                    long len = result.getBytes().length;
                    speed = speed(time, len);
                }
                Message message = new Message();
                Bundle bundle = new Bundle();
                bundle.putString("speed", speed);
                message.setData(bundle);
                message.what = idMap.get(id);
                handler.sendMessage(message);
            }
        }
  
    }
  
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
  
    private String speed(long time, long len) {
        String speed = "";
        if (time > 0) {
            long s = len * 1000 / time; // B/ms
            speed = s + "B/s";
            if (s > 1024) {
                s = s / 1024;
                speed = s + "KB/s";
            }
            if (s > 1024) {
                s = s / 1024;
                speed = s + "MB/s";
            }
            if (s > 1024) {
                s = s / 1024;
                speed = s + "GB/s";
            }
            String size = len + "B";
            if (len > 1024) {
                len = len / 1024;
                size = len + "KB";
            }
            if (len > 1024) {
                len = len / 1024;
                size = len + "MB";
            }
            String t = time + "ms";
            if (time > 1000) {
                time = time / 1000;
                t = time + "sec";
  
                if (time > 60) {
                    time = time / 60;
                    t = time + "min";
                }
            }
            speed = speed + "(" + size + ", " + t + ")";
        }
        return speed;
    }
  
}