java 你如何取消倒计时？
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How do you cancel CountDownTimer?
提问by William L.
I have a AlertDialog with a countdown timer in it, and I have a cancel button setup and it cancels the dialog but the timer keeps going! Does anyone know how to cancel the countdown of a countdown timer? Any help would be appreciated!
我有一个带有倒数计时器的 AlertDialog，我有一个取消按钮设置，它取消了对话框但计时器继续运行！有谁知道如何取消倒数计时器的倒计时？任何帮助，将不胜感激！
private void timerDialog() {
timerDialog = new AlertDialog.Builder(this).create();
timerDialog.setTitle("Timer");
timerDialog.setMessage("Seconds Remaining: "+timerNum*1000);
timerDialog.setCancelable(false);
timerDialog.setButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface aboutDialog, int id) {
timerDialog.cancel();
}
});
timerDialog.show();
new CountDownTimer(timerNum*1000, 1000) {
@Override
public void onTick(long millisUntilFinished) {
timerDialog.setMessage("Seconds Remaining: "+ (millisUntilFinished/1000));
}
@Override
public void onFinish() {
Vibrator v = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
v.vibrate(500);
timerDialog.cancel();
}
}.start();
}
回答by wolfcastle
You appear to be calling cancel on the Dialog, but never on the timer. You need to maintain a reference to the CountDownTimer, and call its cancel method in your onClick method.
您似乎在 Dialog 上调用了取消，但从未在计时器上调用过。您需要维护对 CountDownTimer 的引用，并在您的 onClick 方法中调用其取消方法。
private void timerDialog() {
final CountDownTimer timer = new CountDownTimer(timerNum*1000, 1000) {
@Override
public void onTick(long millisUntilFinished) {
timerDialog.setMessage("Seconds Remaining: "+ (millisUntilFinished/1000));
}
@Override
public void onFinish() {
Vibrator v = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
v.vibrate(500);
timerDialog.cancel();
}
};
timerDialog = new AlertDialog.Builder(this).create();
timerDialog.setTitle("Timer");
timerDialog.setMessage("Seconds Remaining: "+timerNum*1000);
timerDialog.setCancelable(false);
timerDialog.setButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface aboutDialog, int id) {
timer.cancel();
}
});
timerDialog.show();
timer.start();
}
回答by Eduardo Sanchez-Ros
Call the cancel()method on CountDownTimer
调用cancel()CountDownTimer 上的方法
