Location for files in order to be able to load them on Android

Questions & Answers
1

I have made my levels for my game in json format. I have a class to load the json file and convert the json to a Serializable object which I in turn use to create a GameObject. My levels are under /Assets/Resources/Levels/ with a file name like *Level01-01.json". I’ve tried using both Application.dataPath and Application.persistentDataPath.

When I execute this on pc it works fine. When I try it on Android it can’t find the file.
Should I put my json files under a different directory? Should I build my FilePath in another way? Is the technique for reading the file wrong?

using System.Collections.Generic;
using System.IO;
using UnityEngine;

public class LevelDataController : MonoBehaviour {

    private string gameDataProjectFilePath = "/Resources/Levels/Level";

    public Level level;
    public string levelpacknr;
    public string levelnr;

    private string FilePath() {
        return Application.dataPath + gameDataProjectFilePath + levelpacknr + "-" + levelnr + ".json";
    }

    public void LoadGameData() {
        string filePath = FilePath();

        if (File.Exists(filePath)) {
            Debug.Log("file at " + filePath + " exists");
            string dataAsJson = File.ReadAllText(filePath);
            level = JsonUtility.FromJson<Level>(dataAsJson);
        } else {
            Debug.Log("file at " + filePath + " does not exist");
        }
    }
}
3

JSON files can be handled as TextAsset in Unity, making things muuuch easier. The only thing you have to do is to move the JSON file from the Resources folder to another folder under Assets such as DataFiles for instance.

public class LevelDataController : MonoBehaviour
{
     // Drag & drop the file located in `Assets/DataFiles/Levels`  
     // into the following field of the inspector
     [SerializeField]
     private TextAsset gameData = null;
 
     public Level level;
     public string levelpacknr;
     public string levelnr;
 
     public void LoadGameData()
     {
         string filePath = FilePath();
 
         if ( gameData != null )
         {
             string dataAsJson = gameData.text ;
             level = JsonUtility.FromJson<Level>(dataAsJson);
         } else
         {
             Debug.LogError("You forgot to drag & drop the JSON file into the inspector");
         }
     }
 }
2

you need to use WWW for accessing content in android since is inside jar, also see documentation for deciding if you should use persistentdatapath or streaming assets. check How to get Resources filepath on Android device? - Questions & Answers - Unity Discussions