Android实现APP秒表功能

Android????????(Timer)???APP??????

??,?Android??????????TextView????????,??:

??,?Activity???TextView???,?????Timer??:

TextView timerTextView = findViewById(R.id.timerTextView);
Timer timer = new Timer();

???,????TimerTask??,?????run()??,?run()???????????:

TimerTask timerTask = new TimerTask() {
int seconds = 0;
@Override
public void run() {
seconds++;
int minutes = seconds / 60;
int hours = minutes / 60;
int sec = seconds % 60;
int min = minutes % 60;
int hrs = hours % 24;
// ??runOnUiThread()????UI
runOnUiThread(new Runnable() {
@Override
public void run() {
timerTextView.setText(String.format("d:d:d", hrs, min, sec));
}
});
}
};

??,????????????timer.schedule()??,??timerTask????????????????:

timer.schedule(timerTask, 0, 1000);

??,??1??,????????????,???????

??????,?Activity???????,????timer.cancel()???????,??????:

@Override
protected void onDestroy() {
super.onDestroy();
timer.cancel();
}