Create a broadcastreceiver or intentservice. Then...
AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
Date date = new Date(); //set this to some specific time
or Calendar calendar = Calendar.getInstance();
//set either of these to the correct date and time.
then
Intent intent = new Intent();
//set this to intent to your IntentService or BroadcastReceiver
//then...
PendingIntent alarmSender = PendingIntent.getService(context, requestCode, intent,
PendingIntent.FLAG_CANCEL_CURRENT);
//or use PendingIntent.getBroadcast if you're gonna use a broadcast
alarmManager.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), mAlarmSender); // date.getTime to get millis if using Date directly.
If you'd like these alarms to work correctly even when the phone is restarted, then add:
<action android:name="android.intent.action.BOOT_COMPLETED"/>
as intentfilter on your Receiver in the manifest and recreate your alarms in onReceive.
EDIT
When you create a BroadcastReceiver in your application, it allows to do exactly what it sounds like: receive broadcasts in the system. So for example, you might some BroadcastReceiver like so:
public class MyAwesomeBroadcastReceiver extends BroadcastReceiver {
//since BroadcastReceiver is an abstract class, you must override the following:
public void onReceive(Context context, Intent intent) {
//this method gets called when this class receives a broadcast
}
}
To send broadcasts to this class explicitly, you define the receiver inside of the manifest, as follows:
<receiver android:name="com.foo.bar.MyAwesomeBroadcastReceiver" android:enabled="true" android:exported="false">
<intent-filter>
<action android:name="SOME_AWESOME_TRIGGER_WORD"/>
<action android:name="android.intent.action.BOOT_COMPLETED"/>
</intent-filter>
</receiver>
Having this in the manifest gets you two things: You can send a broadcast explicitly to your receiver whenever you want by
Intent i = new Intent("SOME_AWESOME_TRIGGER_WORD");
sendBroadcast(intent);
Also, since you've told android you'd like to receive the BOOT_COMPLETED action which is broadcast by the system, your receiver will also get called when that happens.
