[SOLVED][Unity 4 system] Save/Load AssetBundle

Unity Engine
1

I’m trying to create a multilingual project (sound, text and textures).

In a folder I have three assets: a text file, a sound and texture. I created a assetBundle called english.unity3d containing these 3 resources.

Then, I’ll do the same with other languages.

But I can not load at startup by assetBundle this data. Although it locates the file, contains 0 objects.

The code I have obtained from documentation.

using UnityEngine;
using System.Collections;

public class LoadAssetBundle : MonoBehaviour {

    public IEnumerator LoadBundle(){
             
        using(WWW www = WWW.LoadFromCacheOrDownload(Application.dataPath + "/Languages/English.unity3d",0)) {
         
            yield return www;

            if(System.IO.File.Exists(Application.dataPath+"/Languages/English.unity3d")) Debug.Log("File Exists");

            AssetBundle assetBundle = www.assetBundle;
         
            Object[] objects = assetBundle.LoadAllAssets();
         
            Debug.Log("AllAssets Length: " + objects.Length);
         
            foreach(Object str in objects) Debug.Log(str.name);
         
            assetBundle.Unload(false);
         
        }
     
    }
 
    void Start(){
     
        StartCoroutine(LoadBundle());
     
    }

}

I attach the project file to view.

2

Finally, I solved the problem by changing the direction of the file. You need to add “file: ///” at the beginning of the address when we want to access a local file using the WWW object.

To create the AssetBundle I used the system for Unity 4. The new system for Unity 5, I have not finished understand when you create a AssetBundle.

The code for Unity 4 to create a AssetBundle are here. I used this Editor class:

// C# Example
    // Builds an asset bundle from the selected objects in the project view.
    // Once compiled go to "Menu" -> "Assets" and select one of the choices
    // to build the Asset Bundle

    using UnityEngine;
    using UnityEditor;

    public class ExportAssetBundles {
        [MenuItem("Assets/Build AssetBundle From Selection - Track dependencies")]
        static void ExportResource () {
            // Bring up save panel
            string path = EditorUtility.SaveFilePanel ("Save Resource", "", "New Resource", "unity3d");
            if (path.Length != 0) {
                // Build the resource file from the active selection.
                Object[] selection = Selection.GetFiltered(typeof(Object), SelectionMode.DeepAssets);
                BuildPipeline.BuildAssetBundle(Selection.activeObject, selection, path, 0);
                Selection.objects = selection;
            }
        }
        [MenuItem("Assets/Build AssetBundle From Selection - No dependency tracking")]
        static void ExportResourceNoTrack () {
            // Bring up save panel
            string path = EditorUtility.SaveFilePanel ("Save Resource", "", "New Resource", "unity3d");
            if (path.Length != 0) {
                // Build the resource file from the active selection.
                BuildPipeline.BuildAssetBundle(Selection.activeObject, Selection.objects, path);
            }
        }
    }

Although generates the message: Assets/Editor/ExportAssetBundles.cs(17,39): warning CS0618: UnityEditor.BuildPipeline.BuildAssetBundle(UnityEngine.Object, UnityEngine.Object[ ], string, UnityEditor.BuildAssetBundleOptions)' is obsolete: BuildAssetBundle has been made obsolete. Please use the new AssetBundle build system introduced in 5.0 and check BuildAssetBundles documentation for details.’

It works. Select one or more assets, or a folder, you click with the right mouse button and select “Build AssetBundle From Selection - Track Dependencies”, this will create a bundle asset with assets included all subfolders.

This would be the code to load the AssetBundle:

using UnityEngine;
using System.Collections;

public class LoadAssetBundle : MonoBehaviour {

    public IEnumerator LoadBundle(){

        using(WWW www = WWW.LoadFromCacheOrDownload("file:///" + Application.dataPath + "/Languages/English.unity3d",0)) {
       
            yield return www;

            AssetBundle assetBundle = www.assetBundle;
       
            Object[] objects = assetBundle.LoadAllAssets();
       
            // Do stuff with objects

            assetBundle.Unload(false);
       
        }
   
    }

    void Start(){
   
        StartCoroutine(LoadBundle());
   
    }

}

2094884–137096–LoadSaveAssetBundle(Unity 4 system)(SOLVED).unitypackage (28.8 KB)