The scrolling list of visuals is a classic mobile interface pattern. Unfortunately, it’s always been a hassle to implement well on Android.

If they are stored locally, a native Android implementation will result in stuttering. And if they are stored on the web, you have to worry about canceling pending requests, along with caching and a slew of other concerns. As a result, many Android developers have written their own dedicated image downloading component once or twice. In fact, has an exercise where you write one in an app called PhotoGallery, which we’ll talk more about below.

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And when you start to need caching, transformations, and better performance, it’s natural to ask if someone else has solved this problem before you. Just a few months back, I found myself in that exact situation with one of our client apps. I researched some solutions, but didn’t find anything compelling enough to commit to. But right around, a couple of interesting new image libraries were introduced: and. America past and present 7th edition ap outlines of birds. They don’t solve exactly the same problem, but each offers solutions for this image loading issue.

I decided I’d port them both into the PhotoGallery example code from our book to see how they measured up against one another. The Setup: PhotoGallery PhotoGallery is a simple Flickr client that displays the most recent photos on Flickr: Scroll it down, and you’ll see more pictures. Let’s focus on the image downloading code, though. PhotoGalleryFragment has a component called ThumbnailDownloader. It is a single thread that is responsible for downloading images, and provides a callback that gets fired when the image is downloaded. ThumbnailDownloader is initialized inside onCreate() by setting a listener, starting the thread and then calling getLooper() to ensure that its message loop is ready to receive messages.

Picasso.with(getActivity()).load(item.getUrl()).placeholder(R.drawable.brian_up_close).centerCrop().noFade().into(imageView); This is Picasso’s raison d’etre. So why is it difficult?

Picasso’s strength is also its weakness: it caches scaled and cropped image requests. This means that it has to know how big the image is at the time you request it. Unfortunately, you will not know how big the image needs to be at the time you usually build the request: right after you create your view. A more general solution: Volley During I/O itself, we heard about a completely different solution: a library called Volley from the Android dev team. I’ll admit to being extremely excited about Volley after seeing Ficus Kirkpatrick’s. (Just ask if you don’t believe me.) See, Volley isn’t an image loading library—it’s an asynchronous networking library. And what’s the hard part of image loading?