android mars视频代码 Handler 源码 HandlerTest

package ycitss.android.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; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); startButton = (Button) findViewById(R.id.startButton); startButton.setOnClickListener(new StartButtonListener()); endButton = (Button) findViewById(R.id.endButton); endButton.setOnClickListener(new EndButtonListener()); } class StartButtonListener implements OnClickListener { @Override public void onClick(View v) { handler.post(updateThread); } } class EndButtonListener implements OnClickListener { @Override public void onClick(View v) { handler.removeCallbacks(updateThread); } } Handler handler = new Handler(); Runnable updateThread = new Runnable(){ @Override public void run() { System.out.println("UpdateThread"); handler.postDelayed(updateThread, 3000); } }; }