public static Builder newBuilder(@Nullable Context context) {
    return new Builder(context);
  }
Create a new builder.

@param context If this is null, you must explicitly call {@link
    Builder#setBaseDirectoryPath(File)} or {@link
    Builder#setBaseDirectoryPathSupplier(Supplier)} or the config won't know where to
    physically locate the cache.
@return
imagepipeline-base/src/main/java/com/facebook/cache/disk/DiskCacheConfig.java