public ImageRequestBuilder setRequestListener(@Nullable RequestListener requestListener) {
    this.mRequestListener = requestListener;
    return this;
  }
Sets a request listener to use for just this image request

@param requestListener a request listener to use in addition to the global ones set in the
    {@link com.facebook.imagepipeline.core.ImagePipelineConfig}
@return the modified builder instance
imagepipeline/src/main/java/com/facebook/imagepipeline/request/ImageRequestBuilder.java