android之Handler Runnable实现倒计时

 

public class Countdown extends Activity{
    private int time = 30;  //初始化时间

    public void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);

        setContentView(R.layout.countdown);
        handler.postDelayed(runnable, 1000);
    }

    Handler handler = new Handler();
    Runnable runnable = new Runnable() {
        @Override
        public void run() {
          time--;
          if(time>0){
             handler.postDelayed(this, 1000);  //public final boolean postDelayed(Runnable r,
                                                              //long delayMillis)                                                              //从当前时间开始延迟delayMillis时间后执行Runnable
           }
        }
    };
}

   原文地址：http://blog.csdn.net/ithomer/article/details/6903084