Integrate asset delivery (Unity)

public void ConfigureAssetPacks {
   // Creates an AssetPackConfig with a single asset pack, named
   // examplePackName, containing all the files in path/to/exampleFolder.
   var assetPackConfig = new AssetPackConfig();
   assetPackConfig.AddAssetsFolder("examplePackName",
                                   "path/to/exampleFolder",
                                   AssetPackDeliveryMode.OnDemand);

   // Configures the build system to use the newly created assetPackConfig when
   // calling Google > Build and Run or Google > Build Android App Bundle.
   AssetPackConfigSerializer.SaveConfig(assetPackConfig);

   // Alternatively, use BundleTool.BuildBundle to build an App Bundle from script.
   BuildBundle(new buildPlayerOptions(), assetPackConfig);
}

using Google.Play.AssetDelivery;

// After download, the assets and/or AssetBundles contained in the asset pack
// are not loaded into memory.
PlayAssetPackRequest request = PlayAssetDelivery.RetrieveAssetPackAsync(assetPackName);

// Download progress of request, between 0.0f and 1.0f. The value will always be
// 1.0 for assets delivered as install-time.
// NOTE: A value of 1.0 does not mean that the request has completed, only that
// the DOWNLOADING stage is finished.
float progress = request.DownloadProgress;

// Returns the status of the retrieval request.
// If the request completed successfully, this value should be AssetDeliveryStatus.Available.
// If an error occurred, this value should be AssetDeliveryStatus.Failed.

AssetDelivery status = request.Status;
switch(status) {
    case AssetDeliveryStatus.Pending:
        // Asset pack download is pending - N/A for install-time assets.
    case AssetDeliveryStatus.Retrieving:
        // Asset pack is being downloaded and transferred to app storage.
        // N/A for install-time assets.
    case AssetDeliveryStatus.Available:
        // Asset pack is downloaded on disk but NOT loaded into memory.
        // For PlayAssetPackRequest(), this indicates that the request is complete.
    case AssetDeliveryStatus.Failed:
        // Asset pack retrieval failed.
    case AssetDeliveryStatus.WaitingForWifi:
        // Asset pack retrieval paused until either the device connects via Wi-Fi,
        // or the user accepts the PlayAssetDelivery.ShowConfirmationDialog dialog.
    case AssetDeliveryStatus.RequiresUserConfirmation:
        // Asset pack retrieval paused until the user accepts the
        // PlayAssetDelivery.ShowConfirmationDialog dialog.
    default:
        break;
}

// Returns true if status is AssetDeliveryStatus.Available or AssetDeliveryStatus.Failed.
bool done = request.IsDone;

// If AssetDeliveryStatus.Failed, find more info about the error.
AssetDeliveryErrorCode error = request.Error;

if(request.Status == AssetDeliveryStatus.RequiresUserConfirmation
   || request.Status == AssetDeliveryStatus.WaitingForWifi) {
    var userConfirmationOperation = PlayAssetDelivery.ShowConfirmationDialog();
    yield return userConfirmationOperation;

    switch(userConfirmationOperation.GetResult()) {
        case ConfirmationDialogResult.Unknown:
            // userConfirmationOperation finished with an error. Something went
            // wrong when displaying the prompt to the user, and they weren't
            // able to interact with the dialog.
        case ConfirmationDialogResult.Accepted:
            // User accepted the confirmation dialog--an update will start.
        case ConfirmationDialogResult.Declined:
            // User canceled or declined the dialog. It can be shown again.
        default:
            break;
    }
}

// Will only attempt if the status is Pending, Retrieving, or Available; otherwise
// it will be a no-op.
request.AttemptCancel();

// Check to see if the request was successful by checking if the error code is Canceled.
if(request.Error == AssetDeliveryErrorCode.Canceled) {
    // Request was successfully canceled.
}

private IEnumerator LoadAssetPackCoroutine(string assetPackName) {

    PlayAssetPackRequest request =
        PlayAssetDelivery.RetrieveAssetPackAsync(assetPackName);

    while (!request.IsDone) {
        if(request.Status == AssetDeliveryStatus.WaitingForWifi) {
            var userConfirmationOperation = PlayAssetDelivery.ShowConfirmationDialog();

            // Wait for confirmation dialog action.
            yield return userConfirmationOperation;

            if((userConfirmationOperation.Error != AssetDeliveryErrorCode.NoError) ||
               (userConfirmationOperation.GetResult() != ConfirmationDialogResult.Accepted)) {
                // The user did not accept the confirmation. Handle as needed.
            }

            // Wait for Wi-Fi connection OR confirmation dialog acceptance before moving on.
            yield return new WaitUntil(() => request.Status != AssetDeliveryStatus.WaitingForWifi);
        }

        // Use request.DownloadProgress to track download progress.
        // Use request.Status to track the status of request.

        yield return null;
    }

    if (request.Error != AssetDeliveryErrorCode.NoError) {
        // There was an error retrieving the pack. For error codes NetworkError
        // and InsufficientStorage, you may prompt the user to check their
        // connection settings or check their storage space, respectively, then
        // try again.
        yield return null;
    }

    // Request was successful. Load the asset pack into memory.
    AssetBundleCreateRequest assetBundleCreateRequest = request.LoadAssetBundleAsync(path/to/exampleBundle);
    yield return assetBundleCreateRequest;
    AssetBundle assetBundle = assetBundleCreateRequest.assetBundle;

// assetPackNames is an array of strings corresponding to asset packs.
PlayAssetPackBatchRequest batchRequest = PlayAssetDelivery.RetrieveAssetPackBatchAsync(<IListstring> assetPackNames);

// Dictionary of AssetPackStates, with the asset pack name as the key.
Dictionary<string, PlayAssetPackRequest> requests = batchRequest.Requests;

// Returns true if all requests are complete.
bool requestComplete = batchRequest.IsDone;

public IEnumerator GetDownloadSize() {
   PlayAsyncOperation<long> getSizeOperation =
   PlayAssetDelivery.GetDownloadSize(assetPackName);

   yield return getSizeOperation;
   if(operation.Error != AssetDeliveryErrorCode.NoError) {
       // Error while retrieving download size.
    } else {
        // Download size is given in bytes.
        long downloadSize = operation.GetResult();
    }
}

PlayAsyncOperation<string> removeOperation = PlayAssetDelivery.RemoveAssetPack(assetBundleName);

removeOperation.Completed += (operation) =>
            {
                if(operation.Error != AssetDeliveryErrorCode.NoError) {
                    // Error while attempting to remove AssetBundles.
                } else {
                    // Files were deleted OR files did not exist to begin with.
                }
            };