Question

I want to create an alarm object from my application. I am writing a To-Do application which will have an option to set an Alarm on the phone.

I wanna set the Date and Time and also the Label for the alarm.

Calendar c = Calendar.getInstance();
c.setTimeInMillis(System.currentTimeMillis());
        c.clear();
        c.set(Calendar.YEAR, mYear);
        c.set(Calendar.MONTH, mMonth);
        c.set(Calendar.DAY_OF_MONTH, mDay);
        c.set(Calendar.HOUR, mHour);
        c.set(Calendar.MINUTE, mMinute);
        Intent activate = new Intent(this, alaram.class);
        AlarmManager alarams ;
        PendingIntent alarmIntent = PendingIntent.getBroadcast(this, 0, activate, 0);
        alarams = (AlarmManager) getSystemService(this.ALARM_SERVICE);
        alarams.set(AlarmManager.RTC_WAKEUP, c.getTimeInMillis(), alarmIntent);

I tried using the above code to set the alarm but am not able to. I dont get any error either 🙁

Answer 1

As @stealthcopter said, the AlarmManager is used to raise an Alarm your application can catch and then do something. Here is a little example I threw together from other posts, tutorials, and work I’ve done.

Main.java

Intent i = new Intent(this, OnAlarmReceiver.class);
PendingIntent pi = PendingIntent.getBroadcast(this, 0, i,
                                                     PendingIntent.FLAG_ONE_SHOT);
Calendar calendar = Calendar.getInstance();
calendar.set(Calendar.SECOND, calendar.get(Calendar.SECOND) + 10);
AlarmManager alarmManager = (AlarmManager) getSystemService(Context.ALARM_SERVICE);
alarmManager.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), pi);

OnAlarmReceiver.java

public class OnAlarmReceiver extends BroadcastReceiver{

@Override
public void onReceive(Context context, Intent intent) {
    WakeIntentService.acquireStaticLock(context);
    Intent i = new Intent(context, AlarmService.class);
    context.startService(i);
}}

WakeIntentService.java

public abstract class WakeIntentService extends IntentService {

    abstract void doReminderWork(Intent intent);

    public static final String LOCK_NAME_STATIC = "com.android.voodootv.static";
    private static PowerManager.WakeLock lockStatic = null;

    public static void acquireStaticLock(Context context) {
        getLock(context).acquire();
    }

    synchronized private static PowerManager.WakeLock getLock(Context context) {
        if (lockStatic == null) {
            PowerManager powManager = (PowerManager) context
                    .getSystemService(Context.POWER_SERVICE);
            lockStatic = powManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK,
                    LOCK_NAME_STATIC);
            lockStatic.setReferenceCounted(true);
        }
        return (lockStatic);
    }

    public WakeIntentService(String name) {
        super(name);
    }

    @Override
    final protected void onHandleIntent(Intent intent) {
        try {
            doReminderWork(intent);
        } finally {
            getLock(this).release();
        }
    }}

AlarmService.java

public class AlarmService extends WakeIntentService {

    public AlarmService() {
        super("AlarmService");
    }

    @Override
    void doReminderWork(Intent intent) {
        NotificationManager manager = (NotificationManager)
                getSystemService(NOTIFICATION_SERVICE);
        Intent notificationIntent = new Intent(this, Main.class);
        PendingIntent pi = PendingIntent.getActivity(this, 0,
                notificationIntent, PendingIntent.FLAG_ONE_SHOT);
        Notification note = new Notification(R.drawable.icon, "Alarm",
                System.currentTimeMillis());
        note.setLatestEventInfo(this, "Title", "Text", pi);
        note.defaults |= Notification.DEFAULT_ALL;
        note.flags |= Notification.FLAG_AUTO_CANCEL;
        int id = 123456789;
        manager.notify(id, note);
    }
}

This example will create a notification on the status bar after 10 seconds.

Hope it helps.

Also First post here 🙂

Oh almost forgot,

AndroidManifest.xml

<receiver android:name="com.android.alarmmanagertest.OnAlarmReceiver" />
<service android:name="com.android.alarmmanagertest.AlarmService" />
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.permission.VIBRATE" />