WallpaperFragment.kt

private fun setWallpaper() {
    val dialog = ProgressDialog()
    dialog.isCancelable = false
    dialog.title = getString(R.string.setting_up_wallpaper)
    dialog.show(fragmentManager, "")
    runInBackground {
        WallpaperManager.getInstance(activity).setStream(FileInputStream(imageFile))
        runInMainThread {
            dialog.dismiss()
            toast(R.string.wallpaper_set)
        }
    }
}