Open new activity from notification action using intent

gistfile1.txt

private void openNewActivity(String title, String description){
        Intent testIntent = new Intent(this,TestActivity.class);
        testIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK|Intent.FLAG_ACTIVITY_CLEAR_TASK);
        PendingIntent pen = PendingIntent.getActivity(this,15,testIntent,PendingIntent.FLAG_ONE_SHOT);
        NotificationCompat.Builder builder = new NotificationCompat.Builder(this);
        builder.setContentTitle(title)
                .setContentText(description)
                .setSmallIcon(R.mipmap.ic_launcher)
                .setOngoing(true)
                .addAction(R.drawable.ic_play, "Test", pen)
                .setVisibility(NotificationCompat.VISIBILITY_PUBLIC);

        NotificationManagerCompat notificationManagerCompat = NotificationManagerCompat.from(this);
        notificationManagerCompat.notify(5,builder.build());
    }