刷新Activity的Demo

package com.bcjsw.activity; import java.text.SimpleDateFormat; import android.app.Activity; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.widget.TextView; public class HandlerActivity extends Activity { /** Called when the activity is first created. */ static TextView demo; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); demo=(TextView)findViewById(R.id.demo); new Thread(){ public void run(){ while(true){ SimpleDateFormat sDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); String date = sDateFormat.format(new java.util.Date()); System.out.println(date); Message msg = new Message(); msg.what=1; Bundle bundle = new Bundle(); bundle.putString("time", date); msg.setData(bundle); handler.sendMessage(msg); try { Thread.sleep(1000); } catch (InterruptedException e) { e.printStackTrace(); } } } }.start(); } public static Handler handler = new Handler() { public void handleMessage(Message message) { switch (message.what) { case 1: String time=message.getData().getString("time"); demo.setText(time); break; } } }; }