OBB file as Streaming Asset for Android

Hello,

we currently working an a application with only one scene (not a game).
Because the application is more then 600 MB big, I a moved most of the content to a Streaming asset and checked the split checkbox in the build settings. After compiling, the split worked and the Obb has most auf the size.
Now I try to access the data in the Android OS (only images, zip and audio, but 30.000 files).
The follow code is not working, like I read in the documentation:

Code (CSharp):

1. DataPath = Path.Combine(Application.streamingAssetsPath, DataFolder).Replace("\\", "/");

The documentation itself has deadlinks:
https://docs.huihoo.com/unity/5.5/Documentation/Manual/android-OBBsupport.html

as example:
"the asset store has a plugin (adapted from the Google Apk Expansion examples) which does this for you. It will download the .obb and put it in the right place on the sdcard. See http://u3d.as/content/unity-technologies/google-play-obb-downloader/2Qq"

I dont know how I fix this file access issues on Android OS or maybe there is another option.
This is the reason why Im asking here:
Is there some example how I access Streaming Assets Obb files on Android or maybe is there a better solution?

KR Martin

 

Hello @Aurimas-Cernius , thanks for the fast answer.
Its about accessing the streaming assets content as obb on Android.
On Windows all streaming assets are loaded fine, on android the apk works and I see my user interface but all other content stored as Streaming assets as obb. are not loaded.

currently getting the path to the streaming assets looks like this:

Code (CSharp):

1. #if UNITY_ANDROID
2.             DataPath = Path.Combine(Application.streamingAssetsPath, DataFolder).Replace("\\", "/");
3. #endif
4.  
5. #if UNITY_STANDALONE_WIN || UNITY_EDITOR_WIN
6.  
7.             DataPath = Path.Combine(Application.streamingAssetsPath, DataFolder).Replace("\\", "/");

After this, a massive script is running to load more then 30.000 files Images, Audio and thumbs

Loading data looks like this:

Code (CSharp):

1.  
2.     public IEnumerator LoadData()
3.     {
4.         if (!IsInitialized)
5.         {
6.             Debug.Log("Loading data...");
7.             try
8.             {
9.                 var textData = File.ReadAllText(DataPath + QuestionsFile);
10.  
11.                 LoadData(textData);
12.  
13.                 RetryExtractAudio();
14.                 _zipFile = new ZipFile(File.OpenRead(DataPath + SettingsManager.Instance.DataZip));
15.  
16.                 //Update item count
17.                 UpdateItemCount();
18.  
19.            
20.             } catch (Exception exc) { Debug.LogError($"Error loading data: {exc.Message} \n {exc.InnerException}"); }
21.         }
22.         yield return null;
23.     }

 

Hello @Aurimas-Cernius,

thanks for your answer.
This means we have to change all .NET File usage to UnityWebRequest?
Or is there a option to "extract" the obb und put the files back to unity so that I can continue using File .Net Solution.

currently I have no idea and I cant find any helpful example to change following to UnityWebRequest:

Code (CSharp):

1.  public void CheckGetFile(string url)
2.     {
3.         if (!File.Exists(DataPath + url))
4.         {
5.             var filename = Path.GetFileName(url);
6.             foreach (ZipEntry entry in _zipFile)
7.             {
8.                 if (entry.Name.Contains(filename))
9.                 {
10.                     var dirPath = Path.GetDirectoryName(DataPath + MediaPath + entry.Name);
11.                     if (!Directory.Exists(dirPath)) { Directory.CreateDirectory(dirPath); }
12.  
13.                     if (!File.Exists(DataPath + MediaPath + entry.Name) && entry.IsFile)
14.                     {
15.                         using (var zipStream = _zipFile.GetInputStream(entry))
16.                         {
17.                             using (var writer = File.OpenWrite(DataPath + MediaPath + entry.Name))
18.                             {
19.                                 while ((_size = zipStream.Read(_buffer, 0, _buffer.Length)) > 0)
20.                                 {
21.                                     writer.Write(_buffer, 0, _size);
22.                                 }
23.                                 writer.Close();
24.                             }
25.                         }
26.                     }
27.                 }
28.             }
29.         }
30.     }

Is there a option to test the implementation in Windows without uploading the solution to playstore?

 

Hello @Aurielle_Aurilie,

I think I understand.
So because it is a archive .Net file will not work.
But I do not understand why UnityWebRequest is a universal way.
I use UnityWebRequest to communicate with my backend and download files from my server.

Code (CSharp):

1.     private void Download(string address)
2.     {
3.         var webRequest = UnityWebRequest.Get(address);
4.  
5.         var operation = webRequest.SendWebRequest();
6.         StartCoroutine(CoDownloadProgress(operation));
7.     }

More important:
Is there a way to test the obb implementation without uploading all the stuff to PlayStore?

I found a package in Asset Store from @gwiazdorrr called better streaming asset,
maybe, this one can help as well?

https://assetstore.unity.com/packages/tools/input-management/better-streaming-assets-103788

 

@Aurimas-Cernius
push obb on device works fine. My question was only regarding if I can test reading obb on a windows platform.

I tried now reading a json file with:

Code (CSharp):

1.             DataPath = Path.Combine("file://"+ Application.streamingAssetsPath, DataFolder).Replace("\\", "/");
2. .......
3.             using (var www = UnityWebRequest.Get(DataPath + QuestionsFile))
4.             {
5.                 yield return www.SendWebRequest();
6.  
7.                 if (www.isNetworkError || www.isHttpError)
8.                 {
9.                     Debug.LogErrorFormat(this, "Unable to load texture due to {0} - {1}", www.responseCode, www.error);
10.                 }
11.                 else
12.                 {
13.                     //Texture myTexture = ((DownloadHandlerTexture)www.downloadHandler).texture;
14.                     LoadData(www.downloadHandler.text);
15.                 }
16.             }

Which works fine for me. Similar results like:

Code (CSharp):

1. var textData = File.ReadAllText(DataPath + QuestionsFile);

Is the only think I have to change now file:// to

Code (CSharp):

1.   DataPath = Path.Combine("jar:file://"+ Application.streamingAssetsPath, DataFolder).Replace("\\", "/");

And it should work on my android phone?

 

@Aurielle_Aurilie
Thank you very much!
Yep, it worked for the json file now.
Sorry for another question - but UnityWebRequest is quit new for me.

Code (CSharp):

1.         _fileNames = Directory.GetFiles(DataPath + MediaPath + ImagesPath, "*.jpg");

Is there similar solution with webrequest?

 

@Aurimas-Cernius
Okay, its fine. Something I can change.

Currently the debugging of the solution is horrible. Change Code, Build APK with OBB, Create new Release on PlayStore, Upload APK, download new App und start test on Android phone.

Is there a easier way?
Something like reading the obb with the unity editor?

 

@Aurimas-Cernius
Thank you very much.
The App is now in the internal Test phase. All Content is visible and works like expected.
You are the best.

KR