CODEWITHSUNDEEP
androidiosxmlunity-game-engine
kavehmb2000
kavehmb2000

Reputation: 327

How to correctly load XML files on mobile devices using unity3d

I have some level definitions in xml format (with .txt extension) inside (without any subfolders) my project's rescources folder

I for more scalability, I have a plain text file naming all these level definition XMLs

I read that file using

TextAsset WorldList = (TextAsset)Resources.Load("WorldList");

And then I load the needed world:

TextAsset TA = (TextAsset)Resources.Load(/*"LevelDefs/" +*/ Worlds[worldToload]);
xps.parseXml(TA.text);
loadLevel(levelToLoad);

(you see that I have moved these rescources out of subfolder to reduce the chance of them not loading) worldToload here is the index number of that world

program works fine on windows but nothing loads on my android test device. I seem to have problems debugging on device so I only guess something went wrong in loading phase.

any suggestions?

Upvotes: 4

Views: 3299

Answers (2)

kavehmb2000
kavehmb2000

Reputation: 327

Thanks to David I have resolved this problem. for more precision I add some small details: 1-As David points out in his answer (and as stated in unity documentations), we should use StreamingAssets if we want to have the same folder structure. One should use Application.streamingAssetsPathto retrieve the path.

However, files are still in the apk package in android's case, so they should be accessed using unity android's www class.

a good practice here is to create a method to read the file (even mandatory if you are going to read more than one file)

here is one such method:

private IEnumerator LoadDataFromResources(string v)
{
    WWW fileInfo = new WWW(v); 
    yield return fileInfo;
    if (string.IsNullOrEmpty(fileInfo.error))
    {
        fileContents = fileInfo.text;
    }
    else
        fileContents = fileInfo.error;
}

This is a coroutine, and to use it we need to call it using 

yield return StartCoroutine(LoadDataFromResources(path + "/fileName.ext"));

Yet another remark: we can not write into this file or modify it as it's still inside the apk package.

Upvotes: 0

David
David

Reputation: 16277

From Unity Documentation:

Most assets in Unity are combined into the project when it is built. However, it is sometimes useful to place files into the normal filesystem on the target machine to make them accessible via a pathname. An example of this is the deployment of a movie file on iOS devices; the original movie file must be available from a location in the filesystem to be played by the PlayMovie function.

Any files placed in a folder called StreamingAssets in a Unity project will be copied verbatim to a particular folder on the target machine. You can retrieve the folder using the Application.streamingAssetsPath property. It’s always best to use Application.streamingAssetsPath to get the location of the StreamingAssets folder, it will always point to the correct location on the platform where the application is running.

So below snippet should work:

// Put your file to "YOUR_UNITY_PROJ/Assets/StreamingAssets"
// example: "YOUR_UNITY_PROJ/Assets/StreamingAssets/Your.xml"

if (Application.platform == RuntimePlatform.Android)
{
  // Android
  string oriPath = System.IO.Path.Combine(Application.streamingAssetsPath, "Your.xml");

  // Android only use WWW to read file
  WWW reader = new WWW(oriPath);
  while ( ! reader.isDone) {}

  realPath = Application.persistentDataPath + "/Your"; // no extension ".xml"
  var contents = System.IO.File.ReadAll(realPath);
}
else // e.g. iOS
{      
  dbPath = System.IO.Path.Combine(Application.streamingAssetsPath, "Your.xml");
}

Upvotes: 2

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