如何同时启动2个线程？

Question

当国际象棋比赛活动开始时，我想放一个秒表

package com.google.android.webviewdemo;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.webkit.JsResult;
import android.webkit.WebChromeClient;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.widget.TextView;
import android.widget.Toast;
import java.util.*;

public class WebViewDemo extends Activity {

private static final String LOG_TAG = "Smart Cheekers";

private WebView mWebView;

private Handler mHandler = new Handler();

 static boolean check=true;
 static int hr=0,min=0,sec=0;

static TextView time;
public void onCreate(Bundle icicle) {
    super.onCreate(icicle);
    setContentView(R.layout.main);
    mWebView = (WebView) findViewById(R.id.webview);

    time= (TextView) findViewById(R.id.time);

    WebSettings webSettings = mWebView.getSettings();
    webSettings.setSavePassword(false);
    webSettings.setSaveFormData(false);
    webSettings.setJavaScriptEnabled(true);
    webSettings.setSupportZoom(false);

    mWebView.setWebChromeClient(new MyWebChromeClient());

    mWebView.addJavascriptInterface(new DemoJavaScriptInterface(), "demo");

    mWebView.loadUrl("file:///android_asset/index.html");
    WebViewDemo.setTime(hr,min,sec);

     mHandler.postDelayed(mUpdateTimeTask, 100);

}

 private Runnable mUpdateTimeTask = new Runnable() {

     public void run() {

        while (check == true) {
            sec++;
            if (sec == 60) {
                sec = 0;
                min++;
            }
            if (min == 60) {
                min = 0;
                hr++;

            }
            WebViewDemo.setTime(hr,min,sec);
            mHandler.postDelayed(this, 100);

        }
     }
 };

/*  protected void onPause() {
        mHandler.removeCallbacks(mUpdateTimeTask);
        hr=0;min=0;
        sec=0; check=false;
        super.onPause();
    }*/

    @Override
    protected void onResume() {
        super.onResume();
        mHandler.postDelayed(mUpdateTimeTask, 100);
    }


public static void setTime(int hr,int min,int sec){
    time.setText(hr+":"+min+":"+sec);
}

public boolean onCreateOptionsMenu(Menu menu) {
    MenuInflater inflater = getMenuInflater();
    inflater.inflate(R.menu.menu, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // TODO Auto-generated method stub
    // item.getItemId();
    // Toast.makeText(this, "You pressed the text!",
    // Toast.LENGTH_LONG).show();
    mWebView.reload();
    return super.onOptionsItemSelected(item);

}



final class DemoJavaScriptInterface {

    DemoJavaScriptInterface() {
    }

    /**
     * This is not called on the UI thread. Post a runnable to invoke
     * loadUrl on the UI thread.
     */
    public void clickOnAndroid() {
        mHandler.post(new Runnable() {
            public void run() {
                mWebView.loadUrl("javascript:wave()");
            }
        });

    }


    public void comBeat() {

        Toast.makeText(getApplicationContext(), "You beat me!",
                Toast.LENGTH_SHORT).show();
        mWebView.reload();
    }

    public void userBeat() {
        Toast.makeText(getApplicationContext(), "Gotcha! Game over.",
                Toast.LENGTH_SHORT).show();
        mWebView.reload();
    }
}

/**
 * Provides a hook for calling "alert" from javascript. Useful for debugging
 * your javascript.
 */
final class MyWebChromeClient extends WebChromeClient {
    @Override
    public boolean onJsAlert(WebView view, String url, String message,
            JsResult result) {
        Log.d(LOG_TAG, message);
        result.confirm();
        return true;
    }
}

}