Alarm Service | AlarmManagerExample in android

Here we are setting the time to 10 seconds so after 10 seconds a Toast pops up.
For receiving the Broadcast we have to create a class the extends the BroadcastReceiver class on which the onReceive function gets called when the service ends

main.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:orientation="vertical" android:padding="4dip"

    android:gravity="center_horizontal"

    android:layout_width="fill_parent" android:layout_height="fill_parent">

    <TextView

        android:layout_width="fill_parent" android:layout_height="wrap_content"

        android:layout_weight="0"

        android:paddingBottom="4dip"

        android:text="Alarm Demo"/>

    <Button android:id="@+id/one_shot"

        android:layout_width="wrap_content" android:layout_height="wrap_content"

        android:text="Start Alarm">

        <requestFocus />

    </Button>

</LinearLayout>

AndroidManifest :

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.hb"

    android:versionCode="1"

    android:versionName="1.0" >

    <application

        android:icon="@drawable/icon"

        android:label="@string/app_name" >

        <activity

            android:name=".AlarmDemo"

            android:label="@string/app_name" >

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

        <receiver

            android:name=".MyAlarmReceiver"

            android:process=":remote" />

    </application>

</manifest>

MyAlarmReceiver.class

import android.content.BroadcastReceiver;

import android.content.Context;

import android.content.Intent;

import android.widget.Toast;

public class MyAlarmReceiver extends BroadcastReceiver

{

    @Override

    public void onReceive(Context context, Intent intent)

    {

Toast.makeText(context, "Alarm Received after 10 seconds.", Toast.LENGTH_SHORT).show();

    }

}

AlarmDemo.class

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.Toast;

public class AlarmDemo extends Activity {

       Toast mToast;

       @Override

       protected void onCreate(Bundle savedInstanceState) {

              super.onCreate(savedInstanceState);

              setContentView(R.layout.main);

              Button button = (Button)findViewById(R.id.one_shot);

              button.setOnClickListener(mOneShotListener);

       }

       private OnClickListener mOneShotListener = new OnClickListener() {

              public void onClick(View v) {

                     Intent intent = new Intent(AlarmDemo.this,MyAlarmReceiver.class);

                     PendingIntent sender = PendingIntent.getBroadcast(AlarmDemo.this,

                                  0, intent, 0);

                     // We want the alarm to go off 10 seconds from now.

                     Calendar calendar = Calendar.getInstance();

                     calendar.setTimeInMillis(System.currentTimeMillis());

                     calendar.add(Calendar.SECOND, 10);

                     // Schedule the alarm!

                     AlarmManager am = (AlarmManager)getSystemService(ALARM_SERVICE);

                     am.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), sender);

                     // Tell the user about what we did.

                     if (mToast != null) {

                           mToast.cancel();

                     }

                     mToast = Toast.makeText(AlarmDemo.this,"Alarm Started",

                                  Toast.LENGTH_LONG);

                     mToast.show();

              }

       };

}

Ref Link:
Link1:

Link2:
AlarmManagerExample : Visit 

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Thank you :)