# Open an asset and return it's file descriptor
	fun open_fd(file_name: JavaString): NativeAssetFileDescriptor in "Java" `{
		AssetFileDescriptor afd = null;
		try {
			afd = self.openFd(file_name);
		}catch(IOException e){
			Log.e("Error while opening " + file_name, e.getMessage());
			return null;
		}
		return afd;
	`}