[Android] File.Open not work

Why code didn't work in android build (not editor)?

Code (CSharp):

1. using System.IO;
2. using System.Text;
3. using UnityEngine;
4.  
5. public class Test : MonoBehaviour
6. {
7.   private void Start()
8.   {
9.     string path = Path.Combine(Application.streamingAssetsPath, "file.txt");
10.     Debug.Log("Path " + path);
11.  
12.     FileStream stream;
13.     try
14.     {
15.       stream = File.Open(path, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
16.     }
17.     catch (System.Exception ex)
18.     {
19.       Debug.LogError("Exception " + ex.Message);
20.       Debug.LogException(ex);
21.       throw ex;
22.     }
23.  
24.     Debug.Log("Opened!");
25.    
26.     using (var reader = new StreamReader(stream, Encoding.UTF8))
27.     {
28.       string result = reader.ReadToEnd();
29.       Debug.Log(result);
30.     }
31.   }
32. }
33.  

file.txt placed in StreamingAssets with text "Hello, world"

Code (csharp):

1.  
2. Unity Output:
3. Path jar:file:///data/app/com.tn141.test-k9eUQRri9cUpPw2m2Pid3Q==/base.apk!/assets/file.txt
4. Exception Could not find a part of the path "/jar:file:/data/app/com.tn141.test-k9eUQRri9cUpPw2m2Pid3Q==/base.apk!/assets/file.txt".
5.  
6. Logcat output
7. 09-20 02:33:30.011 14847 14865 I Unity   : Path jar:file:///data/app/com.tn141.test-k9eUQRri9cUpPw2m2Pid3Q==/base.apk!/assets/file.txt
8. 09-20 02:33:30.011 14847 14865 I Unity   : UnityEngine.DebugLogHandler:Internal_Log(LogType, String, Object)
9. 09-20 02:33:30.011 14847 14865 I Unity   : UnityEngine.DebugLogHandler:LogFormat(LogType, Object, String, Object[])
10. 09-20 02:33:30.011 14847 14865 I Unity   : UnityEngine.Logger:Log(LogType, Object)
11. 09-20 02:33:30.011 14847 14865 I Unity   : UnityEngine.Debug:Log(Object)
12. 09-20 02:33:30.011 14847 14865 I Unity   : Test:Start() (at D:\Projects\bug_android_file\Assets\Test.cs:12)
13. 09-20 02:33:30.011 14847 14865 I Unity   :
14. 09-20 02:33:30.011 14847 14865 I Unity   : (Filename: D Line: 0)
15. 09-20 02:33:30.011 14847 14865 I Unity   :
16. 09-20 02:33:30.026 14847 14865 E Unity   : Exception Could not find a part of the path "/jar:file:/data/app/com.tn141.test-k9eUQRri9cUpPw2m2Pid3Q==/base.apk!/assets/file.txt".
17. 09-20 02:33:30.026 14847 14865 E Unity   : UnityEngine.DebugLogHandler:Internal_Log(LogType, String, Object)
18. 09-20 02:33:30.026 14847 14865 E Unity   : UnityEngine.DebugLogHandler:LogFormat(LogType, Object, String, Object[])
19. 09-20 02:33:30.026 14847 14865 E Unity   : UnityEngine.Logger:Log(LogType, Object)
20. 09-20 02:33:30.026 14847 14865 E Unity   : UnityEngine.Debug:LogError(Object)
21. 09-20 02:33:30.026 14847 14865 E Unity   : Test:Start() (at D:\Projects\bug_android_file\Assets\Test.cs:21)
22. 09-20 02:33:30.026 14847 14865 E Unity   :
23. 09-20 02:33:30.026 14847 14865 E Unity   : (Filename: D Line: 0)
24. 09-20 02:33:30.026 14847 14865 E Unity   :
25. 09-20 02:33:30.055 14847 14865 E Unity   : DirectoryNotFoundException: Could not find a part of the path "/jar:file:/data/app/com.tn141.test-k9eUQRri9cUpPw2m2Pid3Q==/base.apk!/assets/file.txt".
26. 09-20 02:33:30.055 14847 14865 E Unity   :   at System.IO.FileStream..ctor (System.String path, System.IO.FileMode mode, System.IO.FileAccess access, System.IO.FileShare share, System.Int32 bufferSize, System.Boolean anonymous, System.IO.FileOptions options) [0x0017d] in <c6bd535f6ab848b4a13f34d01b756eef>:0
27. 09-20 02:33:30.055 14847 14865 E Unity   :   at System.IO.FileStream..ctor (System.String path, System.IO.FileMode mode, System.IO.FileAccess access, System.IO.FileShare share) [0x00000] in <c6bd535f6ab848b4a13f34d01b756eef>:0
28. 09-20 02:33:30.055 14847 14865 E Unity   :   at (wrapper remoting-invoke-with-check) System.IO.FileStream..ctor(string,System.IO.FileMode,System.IO.FileAccess,System.IO.FileShare)
29. 09-20 02:33:30.055 14847 14865 E Unity   :   at System.IO.File.Open (System.String path, System.IO.FileMode mode, System.IO.FileAccess access, System.IO.FileShare share) [0x00000] in <c6bd535f6ab848b4a13f34d01b756eef>:0
30. 09-20 02:33:30.055 14847 14865 E Unity   :   at Test.Start () [0x00023] in D:\Projects\bug_android_file\Assets\Test.cs:17
31. 09-20 02:33:30.055 14847 14865 E Unity   : UnityEngine.DebugLogHandl
32. 09-20 02:33:30.056 14847 14865 E Unity   : DirectoryNotFoundException: Could not find a part of the path "/jar:file:/data/app/com.tn141.test-k9eUQRri9cUpPw2m2Pid3Q==/base.apk!/assets/file.txt".
33. 09-20 02:33:30.056 14847 14865 E Unity   :   at Test.Start () [0x0004f] in D:\Projects\bug_android_file\Assets\Test.cs:23
34. 09-20 02:33:30.056 14847 14865 E Unity   :
35. 09-20 02:33:30.056 14847 14865 E Unity   : (Filename: D Line: 0)
36. 09-20 02:33:30.056 14847 14865 E Unity   :
37.  

 

From the documentation for streamingassets :
Android uses files inside a compressed APK
/JAR file,
"jar:file://" + Application.dataPath + "!/assets".

You probably need to 'download' those files with Www or UnityWebRequest rather than using File.Open