Resetting alarms on reboot

问题

User can create different alarms. So it's up to user when to keep alarm and he can keep multiple alarms and I maintain all the scheduled alarms in a database and show to the user for further reference. Below is my code.

if("CREATEONCE".equals(strparam1))
    {
         am.set(AlarmManager.RTC_WAKEUP, l2, pi);// l2 is time in millis
    }else if("CREATEREPEAT".equals(strparam1))
        {

    am.setRepeating(AlarmManager.RTC_WAKEUP, l2, 86400000 , pi); //l2 is time in millis
    }

So this is the code which sets the alarms. User can set multiple alarms. For example he keeps an alarm for 7.00 am for once, 8.00 am for once and 9.00 am dialy. So, for once alarms the code goes to if block and for repeat daily, the code goes to else if block in the code.

If the above 3 alarms are set by user at 6.00 am. If he reboots his device immediately after setting the alarms, the entire alarms don't trigger.

So I have read many posts regarding this like post1, post2. They all just gave to use broadcast receiver to know that device is rebooted. After the broadcast receiver receives a hint that device is rebooted, do I need to repeat above code again by getting the info from sqlite database to make all the alarms work? If so, can someone help me the way to do that from the broadcast receiver? Code snippets are appreciated

Suppose if the user sets 50 alarms, wouldn't it be a long process to get the info of all the 50 alarms and set them again?

回答1:

I don't know how you are storing your alarms. But I suggest it would suffice to set up a system level alarm for the earliest coming alarm. Then once that is triggered, set up the alarm again for the next soonest triggering alarm.

I suggest putting your AlarmSetting call in a service and then call it from a broadcast receiver.

public class AlarmResetReceiver extends BroadcastReceiver {
    public void onReceive(Context context, Intent intent) {
       //your code to set up alarms
    }
}

There are also other conditions upon which you want to set your alarms up again in your manifest

<receiver android:name=".receivers.AlarmResetReceiver">
        <intent-filter>
            <action android:name="android.intent.action.BOOT_COMPLETED" />
            <action android:name="android.intent.action.TIME_SET" />
            <action android:name="android.intent.action.TIMEZONE_CHANGED" />
            <action android:name="android.intent.action.LOCALE_CHANGED" />
        </intent-filter>
    </receiver>

来源：https://stackoverflow.com/questions/16396715/resetting-alarms-on-reboot

标签

android

alarmmanager

reboot