Image doesn't show up in gallery after saving the Bitmap in Android

Question

after creating a directory in:

/storage/emulated/0/Pictures/ViralFindrr

and saving a bitmap in that directory, the directory and file get created, but it doesn't show up as album in my gallery. Did I miss something?

Here is my code:

 private void createDirectoryAndSaveFile(ImageView imageView, String fileName) {

    BitmapDrawable bitmapDrawable = (BitmapDrawable) imageView.getDrawable();
    Bitmap bitmap = bitmapDrawable.getBitmap();

    File dir = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES)+ "/ViralFindrr/");

    if(!dir.exists())
        dir.mkdir();

    File file = new File(dir,System.currentTimeMillis()+".jpg");
    if (file.exists()) {
        file.delete();
    }
    try {
        FileOutputStream out = new FileOutputStream(file);
        bitmap.compress(Bitmap.CompressFormat.JPEG,100,out);
        out.flush();
        out.close();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

I am testing the code on my android device.