AlarmIntentService.java

package io.nervous.alarmtest;

import android.app.IntentService;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.media.Ringtone;
import android.media.RingtoneManager;
import android.net.Uri;
import android.support.v4.app.NotificationCompat;
import android.support.v4.app.TaskStackBuilder;
import android.widget.Toast;

public class AlarmIntentService extends IntentService {
    public AlarmIntentService() {
        super("AlarmIntentService");
    }

    Uri alertUri() {
        Uri alert = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_ALARM);

        if(alert == null) {
            alert = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);

            if(alert == null) {
                alert = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_RINGTONE);
            }
        }
        return alert;
    }

    void notification(String text) {
        NotificationCompat.Builder mBuilder =
                new NotificationCompat.Builder(this)
                        .setSmallIcon(R.drawable.notification_template_icon_bg)
                        .setContentTitle("AlarmTest")
                        .setContentText(text);

        Intent resultIntent = new Intent(this, MainActivity.class);


        TaskStackBuilder stackBuilder = TaskStackBuilder.create(this);
        stackBuilder.addParentStack(MainActivity.class);
        stackBuilder.addNextIntent(resultIntent);
        PendingIntent resultPendingIntent =
                stackBuilder.getPendingIntent(
                        0,
                        PendingIntent.FLAG_UPDATE_CURRENT
                );
        mBuilder.setContentIntent(resultPendingIntent);
        NotificationManager mNotificationManager =
                (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        mNotificationManager.notify(0, mBuilder.build());
    }

    @Override
    protected void onHandleIntent(Intent intent) {
        SharedPreferences prefs = getSharedPreferences(getPackageName(), Context.MODE_PRIVATE);
        long expected = prefs.getLong("expected", -1);
        String desc = "Alarm was " + (System.currentTimeMillis() - expected) + " milliseconds early";
        Toast.makeText(this, desc, Toast.LENGTH_LONG).show();
        notification(desc);

        Ringtone ringtone = RingtoneManager.getRingtone(this, alertUri());
        ringtone.play();

        Intent activityIntent = new Intent(this, MainActivity.class);
        activityIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        startActivity(activityIntent);

        try {
            Thread.sleep(5 * 1000);
        } catch(InterruptedException e) {}

        ringtone.stop();

        AlarmWakefulReceiver.completeWakefulIntent(intent);
    }
}