如何在 Android 或 iPhone 上本地访问 Unity 资产? [英] How to access Unity assets natively on Android or iPhone?

问题描述

我需要在 Unity 插件项目中在 Android 和 iPhone 上本地访问文件(来自 C++ 或 Java 代码).Unity 是否提供任何方法来访问项目资产中的文件?

I need to access a file natively (from C++ or Java code) on Android and iPhone in a Unity plugin project. Does Unity provide any method to access files in the project Assets?

推荐答案

1. 我的解决方法是将文件从 Application.streamingAssetsPath(它在 jar 中，大多数本地库无法访问)复制到 Application.persistentDataPath(完全没问题)，然后将该路径传递给本机代码.
2. 项目中的源文件应该在AssetsStreamingAssets下

c# 中异步复制文件的小示例代码:将此方法添加到继承 MonoBehaviour 的脚本中

Small sample code in c# to copy files async: Add this method to a script which inherits MonoBehaviour

IEnumerator CopyFileAsyncOnAndroid()
{
    string fromPath = Application.streamingAssetsPath +"/";
    //In Android = "jar:file://" + Application.dataPath + "!/assets/" 
    string toPath =   Application.persistentDataPath +"/";

    string[] filesNamesToCopy = new string[] { "a.txt" ,"b.txt"};
    foreach (string fileName in filesNamesToCopy)
    {
        Debug.Log("copying from "+ fromPath + fileName +" to "+ toPath);
        WWW www1 = new WWW( fromPath +fileName);
        yield return www1;
        Debug.Log("yield done");
        File.WriteAllBytes(toPath+ fileName, www1.bytes);
        Debug.Log("file copy done");
    }
    //ADD YOUR CALL TO NATIVE CODE HERE
    //Note: 4 small files can take a second to finish copy. so do it once and
    //set a persistent flag to know you don`t need to call it again
}

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