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AssetBundle（2）AssetBundle的加载和使用_loadfrommemoryasync android

作者：菜鸟追梦旅行 | 2024-02-14 22:39:40

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loadfrommemoryasync android

四种加载方式

1，AssetBundle.LoadFromMemoryAsync           第一种从内存异步加载 IEnumerator
2，AssetBundle.LoadFromFileAsync                  第二种从本地异步加载 IEnumerator
3，WWW.LoadFromCacheOrDownload             第三种使用www来加载
4，UnityWebRequest                                          第四种使用UnityWebRequest

一、AssetBundle.LoadFromMemoryAsync


  1. using System.Collections;
  2. using System.Collections.Generic;
  3. using System.IO;
  4. using UnityEngine;
  5. using UnityEngine.Networking;
  6.  
  7. public class LoadAssetBundles : MonoBehaviour {
  8.  
  9.     IEnumerator Start ()
  10.     {
  11.         string rootPath = Application.streamingAssetsPath;
  12.  
  13.         string path = rootPath+ "/AssetBundles/cubewall.unity3d";
  14.  
  15.         //AssetBundle ab1 = AssetBundle.LoadFromFile("AssetBundles/scenes/share.unity3d");
  16.  
  17.  
  18.         //第一种从内存异步加载 IEnumerator
  19.         AssetBundleCreateRequest request = AssetBundle.LoadFromMemoryAsync(File.ReadAllBytes(path));
  20.         yield return request;
  21.         AssetBundle ab = request.assetBundle;
  22.  
  23.         AssetBundle assetBundleManifest = AssetBundle.LoadFromFile(rootPath+"/AssetBundles/AssetBundles");
  24.         AssetBundleManifest manifest = assetBundleManifest.LoadAsset<AssetBundleManifest>("AssetBundleManifest");
  25.  
  26.         //foreach (string name in manifest.GetAllAssetBundles())
  27.         //{
  28.         //    Debug.Log(name);
  29.         //}
  30.  
  31.         string[] dependencies = manifest.GetAllDependencies("cubewall.unity3d");
  32.  
  33.         foreach (string str in dependencies)
  34.         {
  35.             print(str);
  36.             AssetBundle.LoadFromFile(rootPath+"/AssetBundles/" + str);
  37.         }
  38.  
  39.         //实例化资源
  40.         GameObject wallPrefab = ab.LoadAsset<GameObject>("cubewall");
  41.         Instantiate(wallPrefab);
  42.  
  43.  
  44.         //AssetBundle.UnloadAllAssetBundles(true);
  45.  
  46.     }
  47.  
  48. }

二、AssetBundle.LoadFromFileAsync

  1. using System.Collections;
  2. using System.Collections.Generic;
  3. using System.IO;
  4. using UnityEngine;
  5. using UnityEngine.Networking;
  6.  
  7. public class LoadAssetBundles : MonoBehaviour {
  8.  
  9.     IEnumerator Start ()
  10.     {
  11.         string rootPath = Application.streamingAssetsPath;
  12.  
  13.         string path = rootPath+ "/AssetBundles/cubewall.unity3d";
  14.  
  15.         AssetBundle ab1 = AssetBundle.LoadFromFile("AssetBundles/scenes/share.unity3d");
  16.         
  17.         //第二种从本地异步加载 IEnumerator
  18.         AssetBundleCreateRequest request = AssetBundle.LoadFromFileAsync(path);
  19.         yield return request;
  20.         AssetBundle ab = request.assetBundle;
  21.  
  22.         //AssetBundle ab = AssetBundle.LoadFromFile("AssetBundles/scenes/cubewall.unity3d");
  23.  
  24.         AssetBundle assetBundleManifest = AssetBundle.LoadFromFile(rootPath+"/AssetBundles/AssetBundles");
  25.         AssetBundleManifest manifest = assetBundleManifest.LoadAsset<AssetBundleManifest>("AssetBundleManifest");
  26.  
  27.         //foreach (string name in manifest.GetAllAssetBundles())
  28.         //{
  29.         //    Debug.Log(name);
  30.         //}
  31.  
  32.         string[] dependencies = manifest.GetAllDependencies("cubewall.unity3d");
  33.  
  34.         foreach (string str in dependencies)
  35.         {
  36.             print(str);
  37.             AssetBundle.LoadFromFile(rootPath+"/AssetBundles/" + str);
  38.         }
  39.  
  40.         //实例化资源
  41.         GameObject wallPrefab = ab.LoadAsset<GameObject>("cubewall");
  42.         Instantiate(wallPrefab);
  43.  
  44.  
  45.         //AssetBundle.UnloadAllAssetBundles(true);
  46.  
  47.     }
  48.  
  49. }

三、WWW.LoadFromCacheOrDownload

  1. using System.Collections;
  2. using System.Collections.Generic;
  3. using System.IO;
  4. using UnityEngine;
  5. using UnityEngine.Networking;
  6.  
  7. public class LoadAssetBundles : MonoBehaviour {
  8.  
  9.     IEnumerator Start ()
  10.     {
  11.         string rootPath = Application.streamingAssetsPath;
  12.  
  13.         string path = rootPath+ "/AssetBundles/cubewall.unity3d";
  14.  
  15.         AssetBundle ab1 = AssetBundle.LoadFromFile("AssetBundles/scenes/share.unity3d");
  16.  
  17.         //第三种使用www来加载
  18.         while (!Caching.ready)
  19.         {
  20.             yield return null;
  21.         }
  22.         WWW www = WWW.LoadFromCacheOrDownload(@"file://E:\UnityProjects\Unity5.4\AssetBundleProjects\Assets\StreamingAssets\AssetBundles\AssetBundles\cubewall.unity3d", 1);
  23.         //WWW www = WWW.LoadFromCacheOrDownload(@"http://192.168.1.102/AssetBundles\cubewall.unity3d", 1);
  24.         yield return www;
  25.         if (!string.IsNullOrEmpty(www.error))
  26.         {
  27.             Debug.Log(www.error);
  28.             yield break;
  29.         }
  30.  
  31.         AssetBundle ab = www.assetBundle;
  32.  
  33.         AssetBundle assetBundleManifest = AssetBundle.LoadFromFile(rootPath+"/AssetBundles/AssetBundles");
  34.         AssetBundleManifest manifest = assetBundleManifest.LoadAsset<AssetBundleManifest>("AssetBundleManifest");
  35.  
  36.         //foreach (string name in manifest.GetAllAssetBundles())
  37.         //{
  38.         //    Debug.Log(name);
  39.         //}
  40.  
  41.         string[] dependencies = manifest.GetAllDependencies("cubewall.unity3d");
  42.  
  43.         foreach (string str in dependencies)
  44.         {
  45.             print(str);
  46.             AssetBundle.LoadFromFile(rootPath+"/AssetBundles/" + str);
  47.         }
  48.  
  49.         //实例化资源
  50.         GameObject wallPrefab = ab.LoadAsset<GameObject>("cubewall");
  51.         Instantiate(wallPrefab);
  52.  
  53.  
  54.         //AssetBundle.UnloadAllAssetBundles(true);
  55.  
  56.     }
  57.  
  58. }

四、UnityWebRequest

  1. using System.Collections;
  2. using System.Collections.Generic;
  3. using System.IO;
  4. using UnityEngine;
  5. using UnityEngine.Networking;
  6.  
  7. public class LoadAssetBundles : MonoBehaviour {
  8.  
  9.     IEnumerator Start ()
  10.     {
  11.         string rootPath = Application.streamingAssetsPath;
  12.  
  13.         string path = rootPath+ "/AssetBundles/cubewall.unity3d";
  14.  
  15.         AssetBundle ab1 = AssetBundle.LoadFromFile("AssetBundles/scenes/share.unity3d");
  16.  
  17.         //第四种使用UnityWebRequest
  18.         string url = @"file://E:\UnityProjects\Unity5.4\AssetBundleProjects\Assets\StreamingAssets\AssetBundles\cubewall.unity3d";
  19.         //string url = @"http://192.168.1.102/AssetBundles\cubewall.unity3d";
  20.  
  21.         UnityWebRequest request = UnityWebRequest.GetAssetBundle(url);
  22.         yield return request.Send();
  23.  
  24.         //AssetBundle ab = DownloadHandlerAssetBundle.GetContent(request);
  25.         AssetBundle ab = (request.downloadHandler as DownloadHandlerAssetBundle).assetBundle;
  26.  
  27.         AssetBundle assetBundleManifest = AssetBundle.LoadFromFile(rootPath+"/AssetBundles/AssetBundles");
  28.         AssetBundleManifest manifest = assetBundleManifest.LoadAsset<AssetBundleManifest>("AssetBundleManifest");
  29.  
  30.         //foreach (string name in manifest.GetAllAssetBundles())
  31.         //{
  32.         //    Debug.Log(name);
  33.         //}
  34.  
  35.         string[] dependencies = manifest.GetAllDependencies("cubewall.unity3d");
  36.  
  37.         foreach (string str in dependencies)
  38.         {
  39.             print(str);
  40.             AssetBundle.LoadFromFile(rootPath+"/AssetBundles/" + str);
  41.         }
  42.  
  43.         //实例化资源
  44.         GameObject wallPrefab = ab.LoadAsset<GameObject>("cubewall");
  45.         Instantiate(wallPrefab);
  46.  
  47.  
  48.         //AssetBundle.UnloadAllAssetBundles(true);
  49.  
  50.     }
  51.  
  52. }

加载Manifests

  1.         AssetBundle assetBundle = AssetBundle.LoadFromFile(manifestFilePath);
  2.         AssetBundleManifest manifest = assetBundle.LoadAsset<AssetBundleManifest>("AssetBundleManifest");
  3.         string[] dependencies = manifest.GetAllDependencies("assetBundle"); //Pass the name of the bundle you want the dependencies for.
  4.         foreach (string name in manifest.GetAllAssetBundles())
  5.         {
  6.             Debug.Log(name);
  7.         }
  8.         foreach (string dependency in dependencies)
  9.         {
  10.             AssetBundle.LoadFromFile(Path.Combine(assetBundlePath, dependency));
  11.         }

AssetBundle的卸载

卸载有两个方面
1，减少内存使用
2，有可能导致丢失

什么时候去卸载资源

AssetBundle.Unload(true)卸载所有资源，即使有资源被使用着
1，在关卡切换、场景切换
2，资源没被用的时候 调用
AssetBundle.Unload(false)卸载所有没用被使用的资源

个别资源怎么卸载

1，通过 Resources.UnloadUnusedAssets.
2，场景切换的时候

关于文件校验

CRC MD5 SHA1

相同点：
CRC、MD5、SHA1都是通过对数据进行计算，来生成一个校验值，该校验值用来校验数据的完整性。
不同点：
1. 算法不同。CRC采用多项式除法，MD5和SHA1使用的是替换、轮转等方法；
2. 校验值的长度不同。CRC校验位的长度跟其多项式有关系，一般为16位或32位；MD5是16个字节（128位）；SHA1是20个字节（160位）；
3. 校验值的称呼不同。CRC一般叫做CRC值；MD5和SHA1一般叫做哈希值（Hash）或散列值；
4. 安全性不同。这里的安全性是指检错的能力，即数据的错误能通过校验位检测出来。CRC的安全性跟多项式有很大关系，相对于MD5和SHA1要弱很多；MD5的安全性很高，不过大概在04年的时候被山东大学的王小云破解了；SHA1的安全性最高。
5. 效率不同，CRC的计算效率很高；MD5和SHA1比较慢。
6. 用途不同。CRC一般用作通信数据的校验；MD5和SHA1用于安全（Security）领域，比如文件校验、数字签名等。

结尾

1，依赖包重复问题
a，把需要共享的资源打包到一起
b，分割包，这些包不是在同一时间使用的
c，把共享部分打包成一个单独的包
2，图集重复问题
3，Android贴图问题
4，iOS文件处理重复fixed in Unity 5.3.2p2.

Unity Asset Bundle Browser tool

工具链接：http://pan.baidu.com/s/1slPrVaP 密码：zz80

直接放在Editor目录下即可，在unity编辑器导航栏Windows->AssetBundle Browser




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