Android - Replace parameterized enumeration with @IntDef

Question

How can I avoid parameterized enumeration with @IntDef .

• I want to save some static data associated with each enum / type (for example, the associated URl, associated with it, etc.).

  TYPE_ONE(R.string.res, Urls.URL1),
  
  TYPE_TWO(R.string.res, Urls.URL2),
  
  TYPE_THREE(R.string.res, Urls.URL3),
  
  TYPE_FOUR(R.string.res, Urls.URL4),
  
  TYPE_FIVE(R.string.res, Urls.URL5),
  
  TYPE_SIX(R.string.res, Urls.URL6);
  
  private final int mResId;
  private final String mUrl;
  
  Types(int titleResId, String url) {
    mResId = titleResId;
    mUrl = url;
  }
  
  public int getRes() {
     return mTitleResId;
  }
  
  public String getURL() {
     return mUrl;
  }
  

What is the optimized way to do this?

Answer 1

I know that it enumconsumes much more resources than integer ones, and there is a ban on them on Android, however, in situations like the one you describe, I think that the overhead is offset by increased readability.

, @IntDef , , , @IntDef.

public class Constants {

    public static final int PAGE_ONE = 0;
    public static final int PAGE_TWO = 1;
    public static final int PAGE_THREE = 2;

    @IntDef(value={PAGE_ONE, PAGE_TWO, PAGE_THREE})
    public @interface PageType {}

    private static final SparseArray<String> PAGE_TITLES = new SparseArray<>();
    private static final SparseArray<Integer> PAGE_IMAGES = new SparseArray<>();
    static {
        PAGE_TITLES.put(PAGE_ONE, "PAGE_ONE");
        PAGE_IMAGES.put(PAGE_ONE, R.drawable.page_one);

        PAGE_TITLES.put(PAGE_TWO, "PAGE_TWO");
        PAGE_IMAGES.put(PAGE_TWO, R.drawable.page_two);

        PAGE_TITLES.put(PAGE_THREE, "PAGE_THREE");
        PAGE_IMAGES.put(PAGE_THREE, R.drawable.page_three);
    }

    public static int getPageDrawable(@PageType int pageNumber){
        return PAGE_IMAGES.get(pageNumber);
    }

    public static String getPageTitle(@PageType int pageNumber){
        return PAGE_TITLES.get(pageNumber);
    }

    private Constants(){}
}