How to add actions to my notification's button?

Here is my code for notification:-

public void showNotification(String Name, String Rate, int Image_Source, int PandP, int Repeat) {

    RemoteViews remoteview = new RemoteViews(getPackageName(), R.layout.notification_layout);

    PendingIntent pi = PendingIntent.getActivity(this, 0, new Intent(this, SongsListActivity.class), 0);
    notification = new NotificationCompat.Builder(this)
            .setContent(remoteview)
            .setPriority(2)
            .setTicker(NameD.getText())
            .setSmallIcon(R.mipmap.ic_launcher)
            .setContentTitle(NameD.getText())
            .setContentText(RateD.getText())
            .setContentIntent(pi)
            .setAutoCancel(false)
            .setCustomBigContentView(remoteview)
            .build();

    notification.bigContentView = remoteview;
    remoteview.setImageViewResource(R.id.Repeat_N, Repeat);
    remoteview.setImageViewResource(R.id.P_and_P_N, PandP);
    remoteview.setTextViewText(R.id.Name_N, Name);
    remoteview.setTextViewText(R.id.Rate_N, Rate);
    remoteview.setImageViewResource(R.id.Image_N, Image_Source);
    notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
    notificationManager.notify(111111, notification);
}

here is my xml of notification:-

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

<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#2196F3">

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="100dp"
    android:background="#2196F3"
    android:orientation="horizontal">

    <ImageView
        android:id="@+id/Image_N"
        android:layout_width="100dp"
        android:layout_height="100dp"
        tools:ignore="ContentDescription" />

    <LinearLayout
        android:id="@+id/text_container"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">

        <TextView
            android:id="@+id/Name_N"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1"
            android:gravity="bottom"
            android:textAppearance="?android:textAppearanceMedium"
            android:textColor="@android:color/white"
            android:textStyle="bold"
            android:maxLength="25"/>

        <TextView
            android:id="@+id/Rate_N"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1"
            android:gravity="top"
            android:textAppearance="?android:textAppearanceMedium"
            android:textColor="#F44336" />

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1">

            <ImageButton
                android:id="@+id/Repeat_N"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:src="@drawable/ic_repeat_white_48dp"
                android:background="#2196F3"/>

            <ImageButton
                android:id="@+id/Previous_N"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:src="@drawable/ic_skip_previous_white_48dp"
                android:background="#2196F3"/>

            <ImageButton
                android:id="@+id/P_and_P_N"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:src="@drawable/ic_play_arrow_white_48dp"
                android:background="#2196F3"/>

            <ImageButton
                android:id="@+id/Next_N"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:src="@drawable/ic_skip_next_white_48dp"
                android:background="#2196F3"/>


        </LinearLayout>

    </LinearLayout>

</LinearLayout>

Layout of my notification

now how do i add action to the 4 buttons in the notification so that:-

a) the Pause Imagebutton pauses the MediaPlayer mediaplayer and then change it image to play.

b) the next and previous Imagebuttons call a method mediaplayer(int i)

c) the Repet Imagebutton call a method changeRepeat()

I am a new programer so please bear with me cuz this is first time i am dealing with notifications and i dont know anything about it. i tried to gather all the information that i could and now i have upto this stage. Please help me