Handler实例

package mars.Handler;

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 {
    /** Called when the activity is first created. */
private Button startButton=null;
private Button endButton=null;
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        startButton=(Button)findViewById(R.id.stratButton);
        startButton.setOnClickListener(new StartButtonListener());
        endButton=(Button)findViewById(R.id.endButton);
        endButton.setOnClickListener(new EndButtonListener());
     
      
       
    }
     class StartButtonListener implements OnClickListener{

   public void onClick(View v) {
    // TODO Auto-generated method stub
    handler.post(updateThread);
   }
     
     }
     class EndButtonListener implements OnClickListener{

   public void onClick(View v) {
    // TODO Auto-generated method stub
    handler.removeCallbacks(updateThread);
   }
     
     }
       Handler handler=new Handler();
      Runnable updateThread=new Runnable(){
          public void run(){
           System.out.println("UpdateThread");
           handler.postDelayed(updateThread,3000);
          
          
          }
         };
}