Android : Do something when a headset is plugged in when my app is running in the background. (if possible i want to do it with broadcast receivers)

I want to do something when a headset is plugged in when my app is running in the background. (if possible I want to do it with a broadcast receiver)

I tried the code below:

--ReceiveBroadcast--

package com.example.openmusiconheadsetconnect;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;

public class ReceiveBroadcast extends BroadcastReceiver {
    public ReceiveBroadcast() {
    }

    @Override
    public void onReceive(Context context, Intent intent) {
        Toast.makeText(context,"Received!",Toast.LENGTH_LONG).show();
    }
}

--Manifest--

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

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <receiver
            android:name=".ReceiveBroadcast"
            android:enabled="true"
            android:exported="true" >
            <intent-filter>
                <action android:name="android.intent.action.HEADSET_PLUG" />
            </intent-filter>
        </receiver>
    </application>
</manifest>

Thank you!