How to Run a Service Every Day at Noon, and on Every Boot

How to run a service every day at noon, and on every boot

Android alarmmanager is your answer. use it with a broadcast receiver which also resets the alarms on phone wake.

Now with code example:
Setting alarm inside a method:

Intent intent = new Intent(context, AlarmReceiver.class);
intent.setAction("packagename.ACTION");
PendingIntent pendingIntent = PendingIntent.getBroadcast(context,
            0, intent, PendingIntent.FLAG_CANCEL_CURRENT);
Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(System.currentTimeMillis());
        AlarmManager alarm = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
alarm.cancel(pendingIntent);
alarm.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), AlarmManager.INTERVAL_DAY, pendingIntent);

Receiver for your interval:

public class AlarmReceiver extends BroadcastReceiver {
private final String SOMEACTION = "packagename.ACTION"; //packagename is com.whatever.www
@Override
public void onReceive(Context context, Intent intent) {
    Time now = new Time();
    now.setToNow();
    String time = FileHandler.timeFormat(now);

    String action = intent.getAction();
    if(SOMEACTION.equals(action)) {
        // here you call a service etc.
    }

Receiver for resetting alarms whenever phone has been shut down.

public class AlarmSetter extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        // get preferences
        SharedPreferences preferences = context.getSharedPreferences("name_of_your_pref", 0);
        Map<String, ?> scheduleData = preferences.getAll();

        // set the schedule time
        if(scheduleData.containsKey("fromHour") && scheduleData.containsKey("toHour")) {
            int fromHour = (Integer) scheduleData.get("fromHour");
            int fromMinute = (Integer) scheduleData.get("fromMinute");

            int toHour = (Integer) scheduleData.get("toHour");
            int toMinute = (Integer) scheduleData.get("toMinute");

            //Do some action
        }
    }

}

Manifest very important, this is added under application:

        <receiver android:name="AlarmReceiver">
        <intent-filter>
            <action android:name="packagename.ACTION"/>
            <action android:name="packagename.ACTION2"/>
        </intent-filter>
    </receiver>

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

Also in order for this to work you need to add permission to receive the boot Broadcast in the manifest with following line:

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

Hope this cleared things up, if any errors plz tell.

Edit (added alarmsetter example):

public class AlarmSetter extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        // Do your stuff
    }
}

How to start service at the particular time?

Use android AlarmManager to schedule alarms.
you can register multiple alarms for your application.

hope this link helps you

Spring Scheduling - Cron expression for everyday at midnight not working?

I finally got it to work with this cron expression 0 0 0 * * * but I had to set the time zone in the scheduler class like this.
@Scheduled(cron = "0 0 0 * * *",zone = "Indian/Maldives")

Is it possible to run an application automatically on boot up as background service in J2me?

Yes, Srizan,
It is possible using the Application Settings. You need to set the Auto Start setting to true in Application Settings.

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