FileCopyExample.kt

class FileCopyFragment : Fragment() {
    fun copyFiles(files: List<File>, destination: File) {
        launch(Dispatcher.Background) {
            for (file in files) {
                val needsOverride = destination.listFiles()?.any { it.name == file.name } ?: false
                if (needsOverride && !confirmFileOverride(file.name)) {
                    continue
                }
                file.copyTo(destination)
            }
        }
    }

    suspend fun confirmFileOverride(fileName: String): Boolean {
        val overrideAllowed = withContext(Dispatcher.Main) {
            suspendCoroutine<Boolean> { cont ->
                AlertDialog.Builder(activity).apply {
                    setMessage("Destination already has file named $fileName")
                    setPositiveButton("Replace the file") { dialog: DialogInterface, _: Int ->
                        dialog.dismiss()
                        cont.resumeWith(Result.success(true))
                    }
                    setNegativeButton("Skip this file") { dialog: DialogInterface, _: Int ->
                        dialog.dismiss()
                        cont.resumeWith(Result.success(false))
                    }
                }.create().show()
            }
        }
        return overrideAllowed
    }
}