Unity Android上修改存储文本数据

思路：
原数据存放在StreamingAsset中，首次启动复制到persistentDataPath，以后进行更新和读取都在persistentDataPath中管理的文件进行。需要恢复书序的时候从StreamingAsset中获取即可。

—>脚本下载

---

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System.IO;
public class AndroidFileHelper{

  //---------- FILE NO EXISTS ------------//
  // 从StreamingAsset中复制文件
  static public void CopyFileFromStreamingAsset(string file_name)
  {
    string from_path;
    if (Application.platform == RuntimePlatform.Android)
      from_path = "jar:file://" + Application.dataPath + "!/assets/" + file_name;
    else
      from_path = Application.streamingAssetsPath + "/" + file_name;

    string to_path = Application.persistentDataPath + "/" + file_name;
    WWW www = new WWW(from_path);
    while (!www.isDone) { }
    if(www.error == null)
      File.WriteAllBytes(to_path, www.bytes);
  }

  // 在PersistentData创建文件
  static public void CreateFileInPersistentData(string file_name)
  {
    string path = Application.persistentDataPath + "/" + file_name;
    if (File.Exists(path)) return;
    FileStream fs = File.Create(path);
    fs.Close();
  }

  //------------ READ FILE START ----------//

  //读取文件
  static public string ReadFileOrCopy(string file_name)
  {
    string path = Application.persistentDataPath + "/" + file_name;
    if (!File.Exists(path)) CopyFileFromStreamingAsset(file_name);
    return File.ReadAllText(path);
  }

  //按行读取文件
  static public string[] ReadFileLinesOrCopy(string file_name)
  {
    string path = Application.persistentDataPath + "/" + file_name;
    if (!File.Exists(path)) CopyFileFromStreamingAsset(file_name);
    return File.ReadAllLines(path);  
  }

  //直接从StreamingAsset中读取文件
  static public string ReadFileFromStreamingAsset(string file_name)
  {
    string from_path;
    if (Application.platform == RuntimePlatform.Android)
      from_path = "jar:file://" + Application.dataPath + "!/assets/" + file_name;
    else
      from_path = Application.streamingAssetsPath + "/" + file_name;

    WWW www = new WWW(from_path);
    while (!www.isDone) { }
    if (www.error == null) return www.text;
    else return www.error;
  }

  //直接从StreamingAsset中按行读取文件
  static public string[] ReadFileLinesFromStreamingAsset(string file_name)
  {
    string str = ReadFileFromStreamingAsset(file_name);
    return str.Split("\n"[0]);
  }

  //读取文件，没有就创建一个空的
  static public string ReadFileOrCreat(string file_name)
  {
    string path = Application.persistentDataPath + "/" + file_name;

    if (!File.Exists(path)) CreateFileInPersistentData(file_name);
    return File.ReadAllText(path);
  }

  //按行读取文件，没有就创建一个空的
  static public string[] ReadFileLinesOrCreat(string file_name)
  {

    string path = Application.persistentDataPath + "/" + file_name;
    Debug.Log(path);
    if (!File.Exists(path)) CreateFileInPersistentData(file_name);
    return File.ReadAllLines(path);
  }
  //------------ WRITE FILE START ----------//

  // 更新文件
  static public void WriteFile(string file_name, string str)
  {
    string path = Application.persistentDataPath + "/" + file_name;
    File.WriteAllText(path, str);
  }

  //按行更新文件
  static public void WriteFileLines(string file_name, string[] str_list)
  {
    string path = Application.persistentDataPath + "/" + file_name;
    File.WriteAllLines(path, str_list);
  }

  //------------ DELETE FILE START --------//
  //删除目标文件
  static public void DeleteFile(string file_name)
  {
    string path = Application.persistentDataPath + "/" + file_name;
    File.Delete(path);
  }

}