android studio定时器

1.超时

CountDownTimer第一个参数超时时间,第二个参数多久执行一次onTick(), 到达设定的超时时间执行onFinsh(),cancel取消超时计数,start重新开始(从零开始)。
 private CountDownTimer afterRunTimer=new CountDownTimer(,) {
@Override
public void onTick(long l) { LogUtil.d("TAG", "onTick: afterRunTimer");
} @Override
public void onFinish() { afterRunTimer.cancel(); getActivity().runOnUiThread(new Runnable() {
@Override
public void run() { LogUtil.d("TAG", "onFinish: afterRunTimer readSN");
readSN(); }
}); }
};

2.

handler.postDelayed(myRunnable,1000);
 private Handler handler=new Handler();

    private Runnable myRunnable=new Runnable() {
@Override
public void run() { Log.d("TAG","myRunnable");
//间隔时间循环执行
//handler.postDelayed(myRunnable,1000);
}
};
上一篇:mysql中count的注意事项


下一篇:File中mkdir()和mkdirs()的区别