- 2、对于每个捆绑包，将Asset Delivery更改为**「Install Time」、「Fast Follow」或「On Demand」**。解决任何错误或依赖项并关闭窗口。
-
3、选择Google > Build Android App Bundle以构建应用程序包。
-
4、(可选)配置你的应用程序包以支持不同的纹理压缩格式。
常见的纹理压缩格式：
-
DDS 或 S3TC：有时称为 DXTC 或 DXTn。OpenGL 支持此格式的三种形式。
-
ETC1：大多数设备都支持此格式。这种格式不支持透明度，但游戏可将第二个纹理文件用于 Alpha 通道组件。
-
ETC2：支持 GLES3 的所有设备均支持此格式。
-
PVRTC：iOS 游戏常用的格式，在某些 Android 设备上也受支持。
-
ASTC：专为取代之前的格式而设计的新格式。比先前的格式更加灵活，因为它支持各种块大小。使用这种格式可以帮助您优化游戏大小。
支持的格式及支持相应格式设备所占的百分比：
使用 API 配置资产包
你可以通过编辑器脚本配置资产交付，这些脚本可以作为自动构建系统的一部分运行。
使用 AssetPackConfig 该类来定义要包含在 Android App Bundle 构建中的资产，以及模式。这些资产包不需要包含 AssetBundle。
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);
}
你还可以使用类中的静态 BuildBundle 方法Bundletool生成带有资产包的 Android App Bundle，给定 「BuildPlayerOptions」 和 「AssetPackConfig」。
Play Asset Delivery Unity API 集成
================================
该 「Play Asset Delivery Unity API」 提供了请求资产包，下载管理，和访问资源的功能。**「确保」**首先将 Unity 插件添加到你的项目中。
你在 API 中使用的函数取决于你创建资产包的方式。
-
如果你使用 UI 配置 AssetBundles，请**「选择插件配置的资产包」**。
-
如果你使用 API 配置资产包，请选**「择API 配置的资产包」**。
你可以根据要访问的资产包的交付类型实施 API。这些步骤显示在以下流程图中。
检索 AssetBundles
导入 Play Asset Delivery API 并调用该 RetrieveAssetBundleAsync()方法来检索 AssetBundle。
using Google.Play.AssetDelivery;
// Loads the AssetBundle from disk, downloading the asset pack containing it if necessary.
PlayAssetBundleRequest bundleRequest = PlayAssetDelivery.RetrieveAssetBundleAsync(asset-bundle-name);
安装时交货
资产包配置为**「install-time」**在应用程序启动时立即可用。你可以使用以下命令从 AssetBundle 加载场景：
AssetBundle assetBundle = bundleRequest.AssetBundle;
// You may choose to load scenes from the AssetBundle. For example:
string[] scenePaths = assetBundle.GetAllScenePaths();
SceneManager.LoadScene(scenePaths[path-index]);
快速跟进和按需交付
这些部分适用于**「fast-follow」和「on-demand」**资产包。
检查状态
每个资产包都存储在应用程序内部存储的单独文件夹中。使用该 「isDownloaded()」 方法确定是否已下载资产包。
监控下载
查询PlayAssetBundleRequest 监控请求状态的 对象：
// 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 will only signify the download is complete. It will still need to be loaded.
float progress = bundleRequest.DownloadProgress;
// Returns true if:
// * it had either completed the download, installing, and loading of the AssetBundle,
// * OR if it has encountered an error.
bool done = bundleRequest.IsDone;
// Returns status of retrieval request.
AssetDeliveryStatus status = bundleRequest.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.Loading:
// Asset pack is being loaded.
case AssetDeliveryStatus.Loaded:
// Asset pack has finished loading, assets can now be loaded.
// For PlayAssetBundleRequest(), this indicates that the request is complete.
case AssetDeliveryStatus.Failed:
// Asset pack retrieval has failed.
case AssetDeliveryStatus.WaitingForWifi:
// Asset pack retrieval paused until either the device connects via Wi-Fi,
// or the user accepts the PlayAssetDelivery.ShowCellularData/confirm/iation dialog.
default:
break;
}
大量下载
大于 150MB 的资产包可以自动下载，但只能通过 Wi-Fi 下载。如果用户未连接到 Wi-Fi，则PlayAssetBundleRequest状态设置为 AssetDeliveryStatus.WaitingForWifi 并暂停下载。在这种情况下，要么等待设备连接到 Wi-Fi，然后继续下载，要么提示用户批准通过蜂窝连接下载包。
if(bundleRequest.Status == AssetDeliveryStatus.WaitingForWifi) {
var user/confirm/iationOperation = PlayAssetDelivery.ShowCellularDataConfirmation();
yield return user/confirm/iationOperation;
switch(user/confirm/iationOperation.GetResult()) {
case /confirm/iationDialogResult.Unknown:
// user/confirm/iationOperation finished with an error. Something went
// wrong when displaying the prompt to the user, and they weren’t
// able to interact with the dialog. In this case, we recommend
// developers wait for Wi-Fi before attempting to download again.
// You can get more info by calling GetError() on the operation.
case /confirm/iationDialogResult.Accepted:
// User accepted the /confirm/iation dialog - download will start
// automatically (no action needed).
case /confirm/iationDialogResult.Declined:
// User canceled or declined the dialog. Await Wi-Fi connection, or
// re-prompt the user.
default:
break;
}
}
取消请求(仅限按需)
如果需要在 AssetBundles 加载到内存之前取消请求，请调用 对象AttemptCancel() 上的方法 PlayAssetBundleRequest：
// Will only attempt if the status is Pending, Retrieving, or Available - otherwise
// it will be a no-op.
bundleRequest.AttemptCancel();
// Check to see if the request was successful by checking if the error code is Canceled.
if(bundleRequest.Error == AssetDeliveryErrorCode.Canceled) {
// Request was successfully canceled.
}
异步请求资产包
在大多数情况下，你应该使用 Coroutines异步请求资产包并监控进度，如下所示：
private IEnumerator LoadAssetBundleCoroutine(string assetBundleName) {
PlayAssetBundleRequest bundleRequest =
PlayAssetDelivery.RetrieveAssetBundleAsync(assetBundleName);
while (!bundleRequest.IsDone) {
if(bundleRequest.Status == AssetDeliveryStatus.WaitingForWifi) {
var user/confirm/iationOperation = PlayAssetDelivery.ShowCellularDataConfirmation();
// Wait for /confirm/iation dialog action.
yield return user/confirm/iationOperation;
if((user/confirm/iationOperation.Error != AssetDeliveryErrorCode.NoError) ||
(user/confirm/iationOperation.GetResult() != /confirm/iationDialogResult.Accepted)) {
// The user did not accept the /confirm/iation - handle as needed.
}
// Wait for Wi-Fi connection OR /confirm/iation dialog acceptance before moving on.
yield return new WaitUntil(() => bundleRequest.Status != AssetDeliveryStatus.WaitingForWifi);
}
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/ Use bundleRequest.DownloadProgress to track download progress.
// Use bundleRequest.Status to track the status of request.
yield return null;
}
if (bundleRequest.Error != AssetDeliveryErrorCode.NoError) {
// There was an error retrieving the bundle. 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. Retrieve AssetBundle from request.AssetBundle.
AssetBundle assetBundle = bundleRequest.AssetBundle;
其他 Play Core API 方法
以下是你可能希望在应用中使用的一些其他 API 方法。
检查下载大小通过对 Google Play 进行异步调用并设置操作完成时的回调方法来检查 AssetBundle 的大小：
public IEnumerator GetDownloadSize() {
PlayAsyncOperation 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();
}
}
移除 AssetBundles你可以删除当前未加载到内存中的快速关注和按需 AssetBundle。进行以下异步调用并设置完成时的回调方法：
PlayAsyncOperation 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.
}
};
测试
==
在 Unity Editor 中，选择Google > Build and Run。
行为
–
「install-time」 包将在应用程序安装过程中安装。
