android - 如何在 Android 中只触发一次警报？

Question

我设置了当用户登陆某个 Activity 时的警报，该 Activity 会在特定时间后触发。我如何检查此警报是否已被触发，以便在用户返回此 Activity 时不会再次设置？如果闹钟已经安排好但没有触发，我只能阻止再次设置闹钟:

alarmIntent = PendingIntent.getBroadcast(context, requestCode, intent, PendingIntent.FLAG_NO_CREATE);
    if (alarmIntent != null) {
        // Alarm is already set
        return;
    }
    alarmIntent = PendingIntent.getBroadcast(context, requestCode, intent, 0);

但如果它已经被触发，这将不起作用，因为警报将在之后被删除，所以 alarmIntent 将是 null

Answer 1

您可以使用共享首选项来检查它是否已设置。

if(!setFlag)
{
    Intent myIntent = new Intent(FirstActivity.this, LogoutService.class);
    pendingIntent = PendingIntent.getService(FirstActivity.this, 0, myIntent, 0);
    AlarmManager alarmManager = (AlarmManager)getSystemService(ALARM_SERVICE);
    Calendar calendar = Calendar.getInstance();
    calendar.setTimeInMillis(System.currentTimeMillis());
    calendar.add(Calendar.MINUTE, 10); //Minutes
    alarmManager.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), pendingIntent);
}