Android Alarm Clock Tutorial - Java Tutorial Blog (1).pdf

7/25/2019 Android Alarm Clock Tutorial - Java Tutorial Blog (1).pdf

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T

Android Alarm Clock Tutorial

his Android tutorial will walk you through to create an alarm clock Android

application. This alarm app is planned to be minimalistic and usable. It

can set alarm for one occurrence for the coming day. You will get alarm ring

sound, a notification message and a message in the app UI. This application

and device can be idle or sleeping when the alarm triggers.
http://javapapers.com/


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We will be using the AlarmManagerAPI to set and ring the alarm


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notification. We will have a TimePicker component and a toggle switch in the UI

to set the alarm time.

AndroidAlarmClock

Android Alarm Clock Application

Application is planned to be simple as possible and you can use this as a base

framework and enhance it by adding fancy features.

1. Android Manifest

AndroidManifest.xml

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We need to give uses-permission for WAKE_LOCK, other than that the

AndroidManifest.xml is pretty standard one. Just need to include the service

and receiver.

2. Android Activity

activity_my.xml

< activity>

< application>< manifest>


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The Android Activity is designed to be simple. We have a TimePicker

component followed by a ToggleButton. Thats it. Choose the time to set

the alarm and toggle the switch to on. The alarm will work.


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AlarmActivity.java


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AlarmActivity uses the AlarmManager to set the alarm and send notification on

alarm trigger.

packagecom.javapapers.androidalarmclock;

importandroid.app.Activity;importandroid.app.AlarmManager;importandroid.app.PendingIntent;importandroid.content.Intent;importandroid.os.Bundle;importandroid.util.Log;importandroid.view.View;importandroid.widget.TextView;importandroid.widget.TimePicker;importandroid.widget.ToggleButton;

importjava.util.Calendar;

publicclassAlarmActivityextendsActivity{

AlarmManageralarmManager; privatePendingIntentpendingIntent;

privateTimePickeralarmTimePicker;privatestaticAlarmActivityinst;privateTextViewalarmTextView;

publicstaticAlarmActivityinstance(){returninst;

}

@OverridepublicvoidonStart(){

super.onStart();inst =this;

}


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3. Alarm Receiver

AlarmReceiver.java

AlarmReceiver is a WakefulBroadcasReceiver, this is the one that

receives the alarm trigger on set time. From here we initiate different actions to

notify the user as per our choice. I have given three type of notifications, first

show a message to user in the activity UI, second play the alarm ringtone and

third send an Android notification message. So this is the place to add

enhancement for different types of user notifications.


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4. Alarm Notification Message


importandroid.app.Activity;importandroid.content.ComponentName;importandroid.content.Context;importandroid.content.Intent;importandroid.media.Ringtone;importandroid.media.RingtoneManager;

importandroid.net.Uri;importandroid.support.v4.content.WakefulBroadcastReceiver;

publicclassAlarmReceiverextendsWakefulBroadcastReceiver

@OverridepublicvoidonReceive(finalContextcontext,Intentint

//this will update the UI with messageAlarmActivityinst =AlarmActivity.instance();

inst.setAlarmText("Alarm! Wake up! Wake up!");

//this will sound the alarm tone//this will sound the alarm once, if you wish to//raise alarm in loop continuously then use MediaPlUrialarmUri =RingtoneManager.getDefaultUri(RingtoneManager

if(alarmUri ==null){alarmUri =RingtoneManager.getDefaultUri(RingtoneManager

}Ringtoneringtone =RingtoneManager.getRingtone(con

ringtone.play();

//this will send a notification messageComponentNamecomp =newComponentName(context.getP

AlarmService.class.getName());startWakefulService(context,(intent.setComponent(c

Activity


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AlarmService.java

The receiver will start the following IntentServiceto send a standard

notification to the user.


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importandroid.app.IntentService;importandroid.app.NotificationManager;importandroid.app.PendingIntent;importandroid.content.Context;importandroid.content.Intent;importandroid.support.v4.app.NotificationCompat;

importandroid.util.Log;

publicclassAlarmServiceextendsIntentService{privateNotificationManageralarmNotificationManager;

publicAlarmService(){super("AlarmService");

}

@Override

publicvoidonHandleIntent(Intentintent){sendNotification("Wake Up! Wake Up!");

}

privatevoidsendNotification(Stringmsg){Log.d("AlarmService","Preparing to send notificatialarmNotificationManager =(NotificationManager)this

.getSystemService(Context.NOTIFICATION_SERV

PendingIntentcontentIntent =PendingIntent.getActi

newIntent(this,AlarmActivity.class),0);

NotificationCompat.BuilderalamNotificationBuilderthis).setContentTitle("Alarm").setSmallIcon

.setStyle(newNotificationCompat.BigTextStyle


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AndroidAlarmClock

This Android tutorial was added on 04/12/2014.

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Shaitansays: 30/12/2014 at 6:38 am

Romansays: 21/01/2015 at 6:14 am

Comments on "Android Alarm Clock Tutorial"

Tutorial:

Sorry 4 double-posting :(

I forgot to add the service in the manifest

now it works, but when the receiver recieve the event it throws a exception:

Unable to start receiver de.it2do.effektivlernen.AlarmReceiver:

java.lang.SecurityException: Neither user 10043 nor current process has

android.permission.WAKE_LOCK.

My Manifest.xml has the permission:

Can you help me? >.

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Android Alarm Clock Tutorial - Java Tutorial Blog (1).pdf