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);
}
};