WallpaperFragment.kt

override fun onCreateOptionsMenu(menu: Menu, inflater: MenuInflater) {
    super.onCreateOptionsMenu(menu, inflater)
    inflater.inflate(R.menu.menu_wallpaper, menu)
}

override fun onOptionsItemSelected(item: MenuItem): Boolean {
    if (!loaded && item.itemId != android.R.id.home) {
        toast(R.string.not_loaded_yet)
    } else {
        when (item.itemId) {
            R.id.menu_item_set_wallpaper -> setWallpaper()
            R.id.menu_item_share_image -> shareWallpaper()
            R.id.menu_item_save_image -> checkPermissionForImageSave()
        }
    }
    return super.onOptionsItemSelected(item)
}

private fun setWallpaper() {

}

private fun shareWallpaper() {

}

private fun checkPermissionForImageSave() {

}