Android耗时线程中修改界面，需要使用Handler

package com.android.factorymode;

import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Context;
import android.net.ConnectivityManager;
import android.net.ethernet.EthernetManager;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.widget.TextView;

//import com.android.factorymode.eth.EthernetEnabler;

public class EthernetTest extends Activity
{
    EthernetManager ethManager;
    WifiManager wifiManager;
    ConnectivityManager connManager;
    TextView ethState;
    TextView ethIp;
    String mip;
    ProgressDialog myDialog;

    private Handler myHandler = new Handler();

    private Runnable myRunnable = new Runnable() {
        public void run() {
            for(int i=1;i<=30;i++)
            {
                mip=getIp();
                if(mip.equals(""))
                {
                    try
                    {
                        Log.d("eth2", "---------------geting ip");
                        Thread.sleep(500);
                    }
                    catch (InterruptedException e)
                    {
                        e.printStackTrace();
                    }
                }
                else
                {
                    myHandler.post(updateUI);
                    break;
                }
            }
        }
    };

    private Runnable updateUI = new Runnable() {
        public void run() {
            myDialog.cancel();
            ethState.setText(R.string.hasConnect);
            ethIp.setText(mip);
        }
    };

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

        myDialog = new ProgressDialog(this);
        myDialog.setMessage(getString(R.string.gettingip));
        ethState=(TextView)findViewById(R.id.eth_status);
        ethIp=(TextView)findViewById(R.id.eth_ip);

        ethManager = (EthernetManager) this.getSystemService(Context.ETHERNET_SERVICE);
        wifiManager = (WifiManager) this.getSystemService(Context.WIFI_SERVICE);
        connManager = (ConnectivityManager) this.getSystemService(Context.CONNECTIVITY_SERVICE);



        wifiManager.setWifiEnabled(false);
        connManager.setMobileDataEnabled(false);
        ethManager.setEnabled(true);

        myDialog.show();

        new Thread(myRunnable).start();

        if(mip.equals(""))
        {
            ethState.setText(R.string.noConnect);
            ethIp.setText(" ");
        }
    }

    public native String getIp();


    static
    {
        System.loadLibrary("getIp");
    }
}