Easy way of getting File paths in Android

StorageUtil.java

public final class StorageUtil {

	public static enum Storage {

		/**
		 * /data/data/com.my.package/data/files/
		 */
		INTERNAL,

		/**
		 * (Varies on manufacturer)
		 * /mnt/sdcard/
		 * /sdcard/
		 * <p/>
		 * etc...
		 */
		EXTERNAL,

		/**
		 * /data/data/com.my.package/data/cache/
		 */
		INTERNAL_CACHE,

		/**
		 * (Varies on manufacturer)
		 * /mnt/sdcard/Android/data/com.my.package/cache/
		 * /sdcard/Android/data/com.my.package/cache/
		 * <p/>
		 * etc...
		 */
		EXTERNAL_CACHE;
	}

	/**
	 * A simple all-in-one method for getting File paths in Android.
	 * If you request EXTERNAL/EXTERNAL_CACHE and there is no mounted external
	 * storage, it will automatically default to internal.
	 *
	 * @param context      Context so that it can request the appropriate File path.
	 * @param storage      Enum value for the preferred location (External/Internal)
	 * @param subDirectory A sub directory path just in case you want to get a sub directory
	 * @return
	 */
	public static File getStorageDirectory (final Context context, final Storage storage, final String subDirectory) {
		final File directory;

		switch (storage) {
			case EXTERNAL:
			case EXTERNAL_CACHE: {
  			// Check If External Even Exists
				if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
					directory = (storage == Storage.EXTERNAL)
							? Environment.getExternalStorageDirectory()
							: context.getExternalCacheDir();
					break;
				}
			}

			case INTERNAL: {
				directory = context.getFilesDir();
				break;
			}

			case INTERNAL_CACHE: {
				directory = context.getCacheDir();
				break;
			}

			default: {
				return null;
			}
		}

		return new File(directory, subDirectory);
	}

	public static File getStorageDirectory (final Context context, final Storage storage) {
		return getStorageDirectory(context, storage, null);
	}

}

How to use this class in android project ?