does Alarm Manager persist even after reboot?

问题

I am really new to android, I have been researching about alarms. I want to alarm if there is a birthday on that day. I\'ve have used alarm manager. I was confused because i have read that it clears after reboot. I don\'t have an android phone so I\'m just using the emulator.

Here\'s my code :

public void schedAlarm() {
    AlarmManager am = (AlarmManager) getSystemService(ALARM_SERVICE);
    Intent intent = new Intent(this, AlarmService.class);
    pendingIntent = PendingIntent.getBroadcast(this, contact.id, intent, PendingIntent.FLAG_ONE_SHOT);
    am.setRepeating(AlarmManager.RTC, timetoAlarm, nextalarm, pendingIntent);
}

I made this BroadcastRecever in replace for AlarmSerivce Here :

public void onReceive(Context context, Intent intent) {
    nm = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
    CharSequence from = \"It Birthday!\";
    CharSequence message =\" Greet your friend.\";
    PendingIntent contentIntent = PendingIntent.getActivity(context, 0, new Intent(), 0);
    Notification notif = new Notification(R.drawable.ic_launcher, \"Birthday\", System.currentTimeMillis());
    notif.setLatestEventInfo(context, from, message, contentIntent);
    nm.notify(1, notif);
 }

is this enough??

回答1:

A simple answer would be NO. But yes you can achieve this by creating a BroadCastReceiver which will start the Alarm while booting completes of the device.

Use <action android:name="android.intent.action.BOOT_COMPLETED" /> for trapping boot activity in BroadCastReceiver class.

You need to add above line in AndroidManifest.xml as follows,

<receiver android:name=".AutoStartUp" android:enabled="true" android:exported="false" android:permission="android.permission.RECEIVE_BOOT_COMPLETED">
     <intent-filter>
        <action android:name="android.intent.action.BOOT_COMPLETED" />
    </intent-filter>
    </receiver>

回答2:

Yes , you can make AlarmManager to work even after rebooting. Perhaps this is the easiest way : add the below code in your AndroidManifest.xml:

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

            <category android:name="android.intent.category.DEFAULT" />
        </intent-filter>
    </receiver>

don't forget to include user-permission to the AndroidManifest.xml as:

<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>

回答3:

in some phones only adding

<action android:name="android.intent.action.Boot_COMPLETED" />

does not work you also have to add

<action android:name="android.intent.action.QUICKBOOT_POWERON" />

along with previous one

来源：https://stackoverflow.com/questions/12034357/does-alarm-manager-persist-even-after-reboot

标签

android

alarmmanager

android-alarms