[Solved] Json Deserialize on Android doesn't work for me

Thomas1 · September 9, 2018, 11:51am

Hi, I try to make an tiny android project & try to deserialize a Json file, but each time I have this exception :
“Unhandled Exception:
System.IO.DirectoryNotFoundException: Could not find a part of the path “/Platformer/Json/Level/document.json”.”
( You can find the project here : https://www.dropbox.com/s/ot4kkor0j27kt8q/Platformer.zip?dl=0 )

The json file called “document.json” :
{ "creator": "Thomas", "name": "Niveau 1" }

I also make an Json test project for a Window Project using this code, and it work fine.

protected LevelJSON GetLevelJSON(string psFileName) { LevelJSON myLevelJSON; Debug.WriteLine("TEST :"); Debug.WriteLine(File.ReadAllText(psFileName)); using (MemoryStream stream = new MemoryStream(Encoding.UTF8.GetBytes(File.ReadAllText(psFileName)))) { DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(LevelJSON)); myLevelJSON = (LevelJSON)ser.ReadObject(stream); } return myLevelJSON; }

And finally, there is one thing that confuses me, when I add the reference for the Json (for use : using System.Runtime.Serialization; ), the PC version & Android version isn’t the same. ( Maybe it doesn’t work because of that, but I have no idea … )
:
( I’m French, so my visual studio is in French )

Also, I use in the both projects besides “using System.Runtime.Serialization;” :
using System.Text; using System.Text;
I spent my weekend to try different things and I’m stuck, I have no idea what is wrong.
Thank to reply if you have any idea about that.

dmanning23 · September 9, 2018, 2:44pm

Filenames on PC are not case-sensitive, but they are case-sensitive on Android (also iOS). Double check that the filename is correct.
You have to open files differently on Android, I don’t know how to use MemoryStream but heres an example of how to open a FileStream on Android:

github.com

dmanning23/XmlBuddy/blob/bd39607f55a2eb670a72afd0c824b022ef9e3d2b/XmlBuddy/XmlBuddy.SharedProject/XmlFile.cs#L83


		/// <summary>
		/// Open the specified xml file and read it in
		/// </summary>
		public virtual void ReadXmlFile()
		{
			try
			{
				if (null == Content)
				{
					// Open the file.
#if ANDROID
					using (var stream = Game.Activity.Assets.Open(Filename.File))
#else
					using (var stream = File.Open(Filename.File, FileMode.Open, FileAccess.Read))
#endif
					{
						XmlDocument xmlDoc = new XmlDocument();
						xmlDoc.Load(stream);
						ParseRootNode(xmlDoc);
					}
				}

Hope this helps, cheers!

MrValentine · September 9, 2018, 9:47pm

Every time I read the French word, Nom, I remember this:

Thomas1 · September 10, 2018, 5:08pm

Hahaha funny ! I open the example on github, but can’t launch the project on any platform

dmanning23 · September 10, 2018, 10:59pm

If you are talking about the github link I posted, yeah that project compiles to a class library

Thomas1 · September 11, 2018, 4:12pm

Ok . I’m still stuck in the Json problem

Thomas1 · September 14, 2018, 5:38pm

YES !
After many tentative, it finally work !
I use :

using (var stream = Game.Activity.Assets.Open("document.json"))

, and I set the Build Action of the Json File into “AndroidAsset”. Thank again !