public GenericRequestBuilder<ModelType, DataType, ResourceType, TranscodeType> placeholder(
            int resourceId) {
        this.placeholderId = resourceId;

        return this;
    }
Sets an Android resource id for a {@link Drawable} resourceto display while a resource
is loading.

@param resourceId The id of the resource to use as a placeholder
@return This request builder.
core/src/main/java/com/bumptech/glide/GenericRequestBuilder.java