Unity 多言語対応

message.xml

<?xml version="1.0" encoding="utf-8"?>

<!-- Resourcesフォルダ以下に配置 -->
<languages>
    <!-- 日本語 -->
    <language name="Japanese">
        <string name="app_name">アプリ名</string>
    </language>


    <!-- 英語(日本語以外) -->
    <language name="English">
        <string name="app_name">App name</string>
    </language>
</languages>

XMLMessage.cs

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

using System.Xml;

/**
 * MEMO: 2017.04.19
 * とりあえず 指定の書式のxml を読み込む
 * エラー処理は基本考慮していない
 * 
 * 定数 ... XMLMessageName.cs で定義
 */

public class XMLMessage : MonoBehaviour {

	[SerializeField, Tooltip("Resourcesフォルダ以下のxmlファイル名(.xmlの指定なしでOKの様子)")]
	private string filePath = null;

	// 仕様に基づいたxmlから読み取った内容を保持
	private Dictionary<string, Dictionary<string, string>> languages;

	#if UNITY_EDITOR
	[SerializeField]
	private SystemLanguage testLanguage = SystemLanguage.Unknown;
	#endif


	// 定数の定義
	private class keyTable {
		/**
		 * XML
		 * languages
		 *  +-language
		 *     +-string (name)
		 */
		public const string language = "language";
		public const string name = "name";
	}


	void Awake () {

		//ファイルの読み込み
		TextAsset xmlTextAsset = Instantiate (Resources.Load (this.filePath)) as TextAsset;
		//Debug.Log (xmlTextAsset.text);

		XmlDocument xmlDoc = new XmlDocument ();
		xmlDoc.LoadXml (xmlTextAsset.text);

		XmlNodeList nodes = xmlDoc.GetElementsByTagName (keyTable.language);
		//Debug.Log (string.Format("nodes count : {0}", nodes.Count));


		foreach (XmlNode node in nodes) {

//			//language
//			Debug.Log (string.Format("node Name : {0}, node.Attributes.Count : {1}", node.Name, node.Attributes.Count));
//			Debug.Log (string.Format("node Name : {0}, node.ChildNodes.Count : {1}", node.Name, node.ChildNodes.Count));
//
//			foreach (XmlAttribute attribute in node.Attributes) {
//				Debug.Log(string.Format("[{0}] Attribute Name : {1}, Value : {2}", node.Name, attribute.Name, attribute.Value));
//			}


			//言語名
			var language = node.Attributes.GetNamedItem (keyTable.name).Value;
			//Debug.Log (string.Format("Language Name : {0}", language));

			//登録内容 (まずは string を想定)
			var values = new Dictionary<string, string>();
			XmlNode child = node.FirstChild;
			do {
				var key = child.Attributes.GetNamedItem (keyTable.name).Value;
				var value = child.FirstChild.Value;

				//Debug.Log (string.Format("child Name:{0}, Key:{1}, Value:{2}", child.Name, key, value));

				values.Add(key, value);
			} while ((child = child.NextSibling) != null);


			if (values.Count > 0) {

				if (this.languages == null) {
					this.languages = new Dictionary<string, Dictionary<string, string>>();
				}

				this.languages.Add (language, values);
			}
		}
	}


	// Use this for initialization
	void Start () {
		//使用例
		Debug.Log (string.Format("Test 0 : {0}", this.getString(XMLMessageName.app_name)));

//		//TEST
//		Debug.Log (string.Format("Test 0 : {0}", this.languages["Japanese"]["app_name"]));
//
//		Debug.Log (string.Format("Test 1 : {0}", this.getString("app_name")));
//		Debug.Log (string.Format("Test 2 : {0}", this.getString("app_name", Application.systemLanguage)));
//		Debug.Log (string.Format("Test 3 : {0}", this.getString("app_name", SystemLanguage.English)));
//		Debug.Log (string.Format("Test 4 : {0}", this.getString("app_name", "Japanese")));
	}


	// Update is called once per frame
	void Update () {
	}


	/**
	 * 文字列の取得 (システムの設定値から)
	 */
	public string getString(string key) {
		#if UNITY_EDITOR
		return this.getString (key, this.testLanguage);
		#else
		return this.getString (key, Application.systemLanguage);
		#endif
	}

	/**
	 * 文字列の取得 (言語 SystemLanguage を指定)
	 */
	public string getString(string key, SystemLanguage language) {
		var name = "";
		if (language == SystemLanguage.Japanese) {
			name = XMLMessageName.Language_Japanese;
		} else {
			name = XMLMessageName.Language_English;
		}

		return this.getString (key, name);
	}

	/**
	 * 文字列の取得
	 */
	public string getString(string key, string language) {

		string value = "";

		if (this.languages != null) {

			//language
			if (this.languages.ContainsKey (language)) {
				var table = this.languages [language];

				//string
				if (table.ContainsKey (key)) {

					//返り値
					value = table [key];
				}
			}
		}

		return value;
	}
}

XMLMessageName.cs

/**
 * 定数の定義
 * message.xml で使用する名称を定義
 */
public class XMLMessageName
{
	//言語名
	public const string Language_Japanese	= "Japanese";
	public const string Language_English	= "English";

	//Key
	public const string Key__TitleTweet		= "app_name";
}