重新启动时，Android Alarm Manager在特定时间未触发

Question

我有AlarmManager问题。 重新启动设备后，即使指定时间不正确，它也会自动触发警报（例如，设备在下午3:00完全重新启动，指定时间为4:00 am）。

到目前为止，这是我尝试过的方法：

class DeviceBootReceiver extends BroadcastReceiver {

@Override
public void onReceive(Context context, Intent intent) {

    // Check if successful reboot
    if (intent.getAction().equals("android.intent.action.BOOT_COMPLETED")) {

        SharedPreferences shared = context.getSharedPreferences(Constants.PREF_NAME, Context.MODE_PRIVATE);
        // Check if daily notification is enabled
        // If yes, call NotificationPublisher to communicate with NotificationAlarmService
        if(shared.getBoolean(Constants.KEY_IS_DAILY_NOTIFIED, false)) {
            DBHelper dbHelper = new DBHelper(context);
            DBConnector.dbConnect(dbHelper);

            int DAILY_NOTIFICATION_ID = Constants.DAILY_VERSE_NOTIFICATION_1_ID;
            ArrayList<Notification> notificationList = dbHelper.getNotifications();
            Log.e("", "notificationList: " + notificationList.size());

            for(Notification obj : notificationList) {
                Calendar datetime = Calendar.getInstance();
                datetime.set(Calendar.HOUR_OF_DAY, obj.getHourOfDay());
                datetime.set(Calendar.MINUTE, obj.getMinute());
                datetime.set(Calendar.SECOND, 0);

                Calendar now = Calendar.getInstance();
                if (now.after(datetime)) {
                    datetime.add(Calendar.DATE, 1);
                }

                Log.e("BOOT RECEIVER", "" + obj.getHourOfDay() + ":" + obj.getMinute());

                Intent myIntent = new Intent(context, NotificationPublisher.class);
                PendingIntent pendingIntent = PendingIntent.getBroadcast(context,
                        DAILY_NOTIFICATION_ID++,
                        myIntent, PendingIntent.FLAG_UPDATE_CURRENT);
                AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
                alarmManager.setRepeating(AlarmManager.RTC_WAKEUP,
                        datetime.getTimeInMillis(), AlarmManager.INTERVAL_DAY,
                        pendingIntent);
            }

        }

    }
}

AndroidManifest：

<receiver
        android:name=".utils.DeviceBootReceiver" >
        <intent-filter>
            <action android:name="android.intent.action.BOOT_COMPLETED" />
            <action android:name="android.intent.action.QUICKBOOT_POWERON" />
        </intent-filter>
    </receiver>

我的代码似乎有什么问题？ 我将不胜感激。 谢谢！

Answer 1

文件说：

如果指定的触发时间已过去，警报将立即触发。

因此，您应该检查应用逻辑中是否设置了过去时间。

例如，在设置警报的BOOT_COMPLETED接收器中，您可以检查它是否是有效时间。 另一个选择是在目标组件中被触发，您可以检查一下。

Answer 2

如果您设置了过去的闹钟，它将立即触发。设置闹钟之前，您必须手动检查它。

public class BootReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        if (intent.getAction().equals("android.intent.action.BOOT_COMPLETED")) {
            // Set alarms
            Calendar calendar = Calendar.getInstance();


            calendar.set(Calendar.HOUR_OF_DAY, 18);
            calendar.set(Calendar.MINUTE, 0);
            calendar.set(Calendar.SECOND, 0);

            Intent intent1 = new Intent(context, AlarmReceiver.class);
            PendingIntent pendingIntent = PendingIntent.getService(
                    context, 0, intent1,
                    PendingIntent.FLAG_UPDATE_CURRENT);
            AlarmManager am = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);

            long triggerMillis = calendar.getTimeInMillis();

            if (calendar.getTimeInMillis() < Calendar.getInstance()
                    .getTimeInMillis()) {
                triggerMillis = calendar.getTimeInMillis() + INTERVAL_DAY;

                System.out.println("Alarm will go off next day");
            }
       #Set alarm here using "triggerMillis"
        .........................
         ...........................
}