manifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.pedromassango.alarmmanagersample">

    <application
        ... >
        <activity android:name=".MainActivity">
            ...
        </activity>
        
        <!-- Registering the BroadcastReceiver !-->
        <receiver android:name=".AlarmBroadcastReceiver"/>
        
    </application>
</manifest>