├── AndroidStreamingAssets.cs
└── README.md


/AndroidStreamingAssets.cs:
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 1 | using UnityEngine;
 2 | using System.IO;
 3 | using System.Collections.Generic;
 4 | using ICSharpCode.SharpZipLib.Zip;
 5 | using ICSharpCode.SharpZipLib.Core;
 6 | 
 7 | public static class AndroidStreamingAssets
 8 | {
 9 | 	private const string STREAMING_ASSETS_DIR = "assets/";
10 | 	private const string STREAMING_ASSETS_INTERNAL_DATA_DIR = "assets/bin/";
11 | 	private const string META_EXTENSION = ".meta";
12 | 
13 | 	private static string m_path = null;
14 | 	public static string Path
15 | 	{
16 | 		get
17 | 		{
18 | 			if( m_path == null )
19 | 				Extract();
20 | 
21 | 			return m_path;
22 | 		}
23 | 	}
24 | 
25 | 	public static void Extract()
26 | 	{
27 | #if !UNITY_EDITOR && UNITY_ANDROID
28 | 		string targetPath = Application.temporaryCachePath;
29 | 		string result = System.IO.Path.Combine( Application.temporaryCachePath, "assets" );
30 | 
31 | 		if( Directory.Exists( result ) )
32 | 			Directory.Delete( result, true );
33 | 
34 | 		Directory.CreateDirectory( targetPath );
35 | 
36 | 		if( targetPath[targetPath.Length - 1] != '/' || targetPath[targetPath.Length - 1] != '\\' )
37 | 			targetPath += '/';
38 | 
39 | 		HashSet<string> createdDirectories = new HashSet<string>();
40 | 		
41 | 		ZipFile zf = null;
42 | 		try
43 | 		{
44 | 			using( FileStream fs = File.OpenRead( Application.dataPath ) )
45 | 			{
46 | 				zf = new ZipFile( fs );
47 | 				foreach( ZipEntry zipEntry in zf )
48 | 				{
49 | 					if( !zipEntry.IsFile )
50 | 						continue;
51 | 
52 | 					string name = zipEntry.Name;
53 | 					if( name.StartsWith( STREAMING_ASSETS_DIR ) && !name.EndsWith( META_EXTENSION ) && !name.StartsWith( STREAMING_ASSETS_INTERNAL_DATA_DIR ) )
54 | 					{
55 | 						string relativeDir = System.IO.Path.GetDirectoryName( name );
56 | 						if( !createdDirectories.Contains( relativeDir ) )
57 | 						{
58 | 							Directory.CreateDirectory( targetPath + relativeDir );
59 | 							createdDirectories.Add( relativeDir );
60 | 						}
61 | 
62 | 						byte[] buffer = new byte[4096];
63 | 						using( Stream zipStream = zf.GetInputStream( zipEntry ) )
64 | 						using( FileStream streamWriter = File.Create( targetPath + name ) )
65 | 						{
66 | 							StreamUtils.Copy( zipStream, streamWriter, buffer );
67 | 						}
68 | 					}
69 | 				}
70 | 			}
71 | 		}
72 | 		finally
73 | 		{
74 | 			if( zf != null )
75 | 			{
76 | 				zf.IsStreamOwner = true;
77 | 				zf.Close();
78 | 			}
79 | 		}
80 | 
81 | 		m_path = result;
82 | #else
83 | 		m_path = Application.streamingAssetsPath;
84 | #endif
85 | 	}
86 | }
87 | 


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/README.md:
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 1 | # Unity Android StreamingAssets
 2 | Sometimes, you may want to use `File.ReadAllText`, `File.Exists` etc. functions on files that are located at `Application.streamingAssetsPath`. However, on Android platform, these files are located inside the application file (*.apk* or *.jar*, not sure) and can only be accessed via **WWW** class.
 3 | 
 4 | This script extracts the contents of StreamingAssets to local file system (**Application.temporaryCachePath/assets/**, to be precise) using **SharpZibLib** library so that you can perform regular file operations on these files. 
 5 | 
 6 | - Use `AndroidStreamingAssets.Path` to access the root directory of the extracted StreamingAssets. This property internally calls the `AndroidStreamingAssets.Extract()` function the first time you access it. 
 7 | 
 8 | - `AndroidStreamingAssets.Extract()` function extracts the StreamingAssets from the application and can optionally be called manually to avoid any stutters when you first call *AndroidStreamingAssets.Path*. Be aware that each call to AndroidStreamingAssets.Extract() function extracts the StreamingAssets over and over again; so it is sufficient and recommended to call this function just once when your application starts. 
 9 | 
10 | This script requires **SharpZipLib** to extract the StreamingAssets (you can just import the *.dll* file to your project): https://github.com/icsharpcode/SharpZipLib/releases
11 | 


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