Alarm at Specific time open Activity

AlarmReceiver.java

public class AlarmReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        // We're creating a new intent that's going to start the MainActivity
        Intent scheduledIntent = new Intent(context, MainActivity.class);
        scheduledIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        context.startActivity(scheduledIntent);
    }
}

MainActivity.kt

class MainActivity : AppCompatActivity() {

    private var alarmManager: AlarmManager? = null
    private var pendingIntent: PendingIntent? = null

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        setupAlarm()
    }

    private fun setupAlarm() {

        // AlarmManager instance from the system services
        alarmManager = this.getSystemService(Context.ALARM_SERVICE) as AlarmManager

        // Intent: this is responsible to prepare the android component what PendingIntent will start when the alarm is triggered. That component can be anyone (activity, service, broadcastReceiver, etc)
        // Intent to start the Broadcast Receiver
        val intent = Intent(this, AlarmReceiver::class.java)

        // PendingIntent: this is the pending intent, which waits until the right time, to be called by AlarmManager
        // The Pending Intent to pass in AlarmManager
        pendingIntent = PendingIntent.getBroadcast(this.applicationContext, 0, intent, 0)

        setAlarm()
    }

    private fun setAlarm() {
        val calendar: Calendar = Calendar.getInstance().apply {
            timeInMillis = System.currentTimeMillis()
            set(Calendar.HOUR_OF_DAY, 13)
        }
        calendar.set(Calendar.MINUTE, 8)

        alarmManager?.setInexactRepeating(
            AlarmManager.RTC_WAKEUP,
            calendar.timeInMillis,
            AlarmManager.INTERVAL_DAY,
            pendingIntent
        )

    }
}

manifest

<uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">

        <receiver android:name=".AlarmReceiver"/>
        <activity android:name=".MainActivity" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

    </application>