Question

我已设置闹钟以在60秒后触发。但是警报在80/90秒后被触发（但不是在60秒之后）。如何设置闹钟以在指定时间准确触发？

 //calling method to set alarm after 60 seconds
    startAlarm(context, 1, System.currentTimeMillis()+60000);

    //method defination
    public static void startAlarm(Context context, int timerType, long nextScheduledTime) {
            EABLog.d(TAG, " ~~~INSIDE START ALARM~~~~~ "+timerType);
            Intent intent = new Intent(context, AlarmReceiver.class);
            intent.putExtra(Constants.KEY_TIMER_TYPE, timerType);
            intent.setAction(""+timerType);
            PendingIntent pollPendingIntent = PendingIntent.getBroadcast(context,
                    timerType, intent, PendingIntent.FLAG_ONE_SHOT);
            AlarmManager alarmManager = (AlarmManager) context
                    .getSystemService(Context.ALARM_SERVICE);
            alarmManager.setExact(AlarmManager.RTC_WAKEUP, nextScheduledTime,
                    pollPendingIntent);
            EABLog.d(TAG, System.currentTimeMillis()+" ALARM IS SET AT "+nextScheduledTime+" TYPE :"+timerType);
        }


//permission added in Android Manifest
    <uses-permission android:name="android.permission.WAKE_LOCK"/>

Answer 1

正如文档所说 setExact - 警报会尽可能传递到所请求的触发时间。所以它并不像你想象的那么精确：）

查看 public void setWindow（int type，long windowStartMillis，long windowLengthMillis，PendingIntent operation） methods第3个参数 - windowLengthMillis 请求的传递窗口的长度，以毫秒为单位。在windowStartMillis之后的这几毫秒内，警报将在不迟于时发送。这可能会成功:)

如何在KITKAT中准确设置闹钟

1 个答案: