android Handler使用

package zhou.demo;

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

public class HandlerActivity extends Activity {
??? private Button startButton = null;
??? private Button endButton = null;
??? public void onCreate(Bundle savedInstanceState) {
??????? super.onCreate(savedInstanceState);
??????? setContentView(R.layout.main);
??????? //声明控件
??????? startButton = (Button)this.findViewById(R.id.startButton);
??????? /**
???????? * 添加事件的处理
???????? */
??????? startButton.setOnClickListener(new OnClickListener(){
???public void onClick(View v) {
????handler.post(updateThread);
???}
??????? });
???????
??????? endButton = (Button)findViewById(R.id.endButton);
??????? /**
???????? * 添加事件的处理
???????? */
??????? endButton.setOnClickListener(new OnClickListener(){
???public void onClick(View v) {
????handler.removeCallbacks(updateThread);
???}
??????? });
???????
??? }
???
???
??? /**
???? * 使用的多线程 进行Handler的处理
???? * 并且使用匿名内部类进行实现
???? */
??? Handler handler = new Handler();
??? Runnable updateThread = new Runnable(){

??@Override
??public void run() {
???// TODO Auto-generated method stub
???System.out.println("Handler正在执行");
???handler.postDelayed(updateThread, 300);
??}
??? ?
??? };
}