How to get AssetBundleManifest from AssetBundle in Unity3D

Question

I have read AssetBundles Document and also tried to get the manifest from the specific assetbundle like the document. I want to get character's manifest but the manifest from the code returns null.

I've changed the AssetBundleManifest at line 5 to character or character.manifest and it is also null:

private IEnumerator LoadAssetBundleManifest()
{
    string assetBundlePath = Application.dataPath + "/../AssetBundles/Android/character";
    AssetBundle assetBundle = AssetBundle.LoadFromFile(assetBundlePath); // assetBundle also have data.
    var manifest = assetBundle.LoadAsset<AssetBundleManifest>("AssetBundleManifest");

    print(manifest); // manifest = null

    yield return null;
}

This image is the folder of my asset:

PS. Now, I'm using Unity 2018.1.1f1.

Answer 1

You were close to solving it. The file you had to load in AssetBundle.LoadFromFile was the file Android, so your code would be like this:

private IEnumerator LoadAssetBundleManifest()
{
    string assetBundlePath = Application.dataPath + "/../AssetBundles/Android/Android";
    AssetBundle assetBundle = AssetBundle.LoadFromFile(assetBundlePath); // assetBundle also have data.
    var manifest = assetBundle.LoadAsset<AssetBundleManifest>("AssetBundleManifest");
    
    Hash128 characterHash = manifest.GetAssetBundleHash("character");
    Debug.Log(characterHash.ToString()); //hash of the character AssetBundle
    
    yield return null;
}

Answer 2

you should do like this

void LoadAsserBundle()
{
    AssetBundle manifestAssetBundle = AssetBundle.LoadFromFile(GetAssetBundlePath("StreamingAssets"));
    AssetBundleManifest assetBundleManifest = manifestAssetBundle.LoadAsset<AssetBundleManifest>("assetbundlemanifest");

    AssetBundle assetBundle = AssetBundle.LoadFromFile(GetAssetBundlePath("character"));
    Hash128 hash = assetBundleManifest.GetAssetBundleHash(assetBundle.name);
}

Answer 3

read the following manual page at the Loading AssetBundle Manifests

Loading AssetBundle Manifests Loading AssetBundle manifests can be incredibly useful. Especially when dealing with AssetBundle dependencies.

To get a useable AssetBundleManifest object, you’ll need to load that additional AssetBundle (the one that’s named the same thing as the folder it’s in) and load an object of type AssetBundleManifest from it.

Loading the manifest itself is done exactly the same as any other Asset from an AssetBundle: AssetBundle assetBundle = AssetBundle.LoadFromFile(manifestFilePath); AssetBundleManifest manifest = assetBundle.LoadAsset<AssetBundleManifest>("AssetBundleManifest");

Now you have access to the AssetBundleManifest API calls through the manifest object from the above example. From here you can use the manifest to get information about the AssetBundles you built. This information includes dependency data, hash data, and variant data for the AssetBundles.

accordingly and from what you show above you are passing the wrong manifest file, you should pass Android asstbundle instead of what you pass.