检查 flutter 中是否存在资产 [英] Check if asset exist in flutter

问题描述

如何检查 Flutter 中是否存在特定资产.我正在尝试加载一些图像和声音文件，但我需要处理这些资源不存在的情况.

How I can check if a specific asset exists in Flutter. I'm trying to load some images and sound files and I need to handle the case when these assets do not exist.

我需要检查是否存在，因为我有数字从 1 到 1000 的音频文件和图像.当我构建我的小部件时，我使用从 1 到 1000 的循环来构建它.并且资产中可能不存在所需的文件(当前编号的图像或声音).

I need to check the existence because I have audio files and images for numbers from 1 to 1000. When I build my widgets I use a loop from 1 to 1000 to build it. and there are possibilities that the required file ( the image or the sound for the current number ) does not exist in the assets.

推荐答案

我假设您正在使用 AssetBundle 类使用 load 方法加载数据，该方法采用ByteData，并且当你使用这个方法时，如果没有找到资产就会抛出异常.

I assume that you are using the AssetBundle class to load your data using the load method which takes ByteData, and when you use this method, it will throws an exception if the asset is not found.

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