Android：如何從資源中分離純數據？

Question

我目前正在執行我的應用程序的數據層，只是想知道what's的最佳方式從相應的android資源，如字符串，顏色等

例如單獨的純數據類/信息：

public final class Location { 
    public static final int NOT_SPECIFIED = 0; 
    public static final int AT_HOME = 1; 
    public static final int AT_WORK = 2; 
    public static final int AWAY = 3; 

    public static final int[] VALUES = { 
      NOT_SPECIFIED, AT_HOME, AT_WORK, AWAY 
    }; 

    @IntDef({ NOT_SPECIFIED, AT_HOME, AT_WORK, AWAY }) 
    @Retention(RetentionPolicy.SOURCE) 
    public @interface Locations {} 

    private static String TXT_NOT_SPECIFIED; 
    private static String TXT_AT_HOME; 
    private static String TXT_AT_WORK; 
    private static String TXT_AWAY; 

    private Location() {} 

    /** 
    * Call once in Application.class to get a reference to the application context 
    * in order to load the string representations for the single locations. 
    * 
    * @param applicationContext the app´s context 
    */ 
    public static void init(Context applicationContext) { 
     Resources res = applicationContext.getApplicationContext().getResources(); 

     /* Pre-load any string resources that correspond to locations. */ 
     TXT_NOT_SPECIFIED = res.getString(R.string.text_location_not_specified); 
     TXT_AT_HOME = res.getString(R.string.text_location_at_home); 
     TXT_AT_WORK = res.getString(R.string.text_location_at_work); 
     TXT_AWAY = res.getString(R.string.text_location_away); 
    } 

    /** 
    * Returns the string representation of a given <code>location</code>. 
    * 
    * @param location must be in range of 0-3 
    *uhr 
    * @return the string representing the <code>location</code> 
    */ 
    public static String getStringForLocation(@Locations int location) { 
     switch (location) { 
      case NOT_SPECIFIED: return TXT_NOT_SPECIFIED; 
      case AT_HOME: return TXT_AT_HOME; 
      case AT_WORK: return TXT_AT_WORK; 
      case AWAY: return TXT_AWAY; 
     } 
     throw new IllegalStateException("'location' must be in range of 0-3"); /* Should never be called actually. */ 
    } 

該類本身包含某些位置的純數據表示（而不是使用enum）。對於每個定義的location，存在strings.xml文件中存儲的字符串表示。 ＃ 現在的問題是：我的應用程序的多個部分需要獲取某個location的名稱。而不是每次我希望將它們存儲在一個地方時找到資源，以便如果有所更改（添加了新的location選項等），我只需在一個地方觸摸代碼即可。

目前我已經實現了它，就像上面的代碼所示：Location類有一個靜態init方法，它在應用程序的onCreate中被調用以獲得context以加載字符串resoruces。 （我知道我可以剛剛通過context作爲getStringForLocation方法的參數，無法決定哪一個更好？）

但是，這種方式我在我所謂的純數據類中有android依賴關係。 什麼是分離這種依賴關係的好方法，同時仍然維護將數據映射到一個資源的代碼？在執行映射的數據層之外有靜態實用方法？

Answer 1

我不太明白爲什麼要在某些變量中預加載字符串。我的理解是，從資源中獲取字符串在性能方面並不昂貴。

我只是用這樣的：

public static String getLocationString(Context context, @Locations int location) { 

    switch (location) { 
     case NOT_SPECIFIED: return context.getString(R.string.text_location_not_specified); 
     case AT_HOME: return context.getString(R.string.text_location_at_home); 
     case AT_WORK: return context.getString(R.string.text_location_at_work); 
     case AWAY: return context.getString(R.string.text_location_away); 
    } 

    throw new IllegalStateException("'location' must be in range of 0-3"); /* Should never be called actually. */ 

} 

，並從活動：

String myLocation = Location.getLocationString(this, Location.AT_HOME); 

而且可以擺脫Location.init方法