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Transparent disk and memory response caching in volley library android

I am new to volley library. I just begin with it reading official documentation.
I found three features that volley library offers but couldn't understand what exactly those mean and how those are used.
Transparent disk and memory response caching with standard HTTP cache coherence.
Ease of customization, for example, for retry and backoff.
Strong ordering that makes it easy to correctly populate your UI with data fetched asynchronously from the network.

Android volley is a networking library was introduced to make networking calls much easier, faster without writing tons of code. By default all the volley network calls works asynchronously, so we don’t have to worry about using asynctask anymore.
Volley comes with lot of features. Some of them are
Request queuing and prioritization
Effective request cache and memory management
Extensibility and customization of the library to our needs
Cancelling the requests

Android Volley vs Retrofit. Which is better and why? [duplicate]

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Two-part question from an iOS developer learning Android, working on an Android project that will make a variety of requests from JSON to image to streaming download of audio and video:
On iOS I have used the AFNetworking project extensively. Is there an equivalent library for Android?
I've read up on OkHTTP and Retrofit by Square, as well as Volley but dont yet have experience developing with them. I'm hoping someone can provide some concrete examples of best use cases for each. From what I've read, seems like OkHTTP is the most robust of the three, and could handle the requirements of this project (mentioned above).

I'm hoping someone can provide some concrete examples of best use cases for each.
Use Retrofit if you are communicating with a Web service. Use the peer library Picasso if you are downloading images. Use OkHTTP if you need to do HTTP operations that lie outside of Retrofit/Picasso.
Volley roughly competes with Retrofit + Picasso. On the plus side, it is one library. On the minus side, it is one undocumented, an unsupported, "throw the code over the wall and do an I|O presentation on it" library.
EDIT - Volley is now officially supported by Google. Kindly refer Google Developer Guide
From what I've read, seems like OkHTTP is the most robust of the 3
Retrofit uses OkHTTP automatically if available. There is a Gist from Jake Wharton that connects Volley to OkHTTP.
and could handle the requirements of this project (mentioned above).
Probably you will use none of them for "streaming download of audio and video", by the conventional definition of "streaming". Instead, Android's media framework will handle those HTTP requests for you.
That being said, if you are going to attempt to do your own HTTP-based streaming, OkHTTP should handle that scenario; I don't recall how well Volley would handle that scenario. Neither Retrofit nor Picasso are designed for that.

Looking at the Volley perspective here are some advantages for your requirement:
Volley, on one hand, is totally focused on handling individual, small HTTP requests. So if your HTTP request handling has some quirks, Volley probably has a hook for you. If, on the other hand, you have a quirk in your image handling, the only real hook you have is ImageCache. "It’s not nothing, but it’s not a lot!, either". but it has more other advantages like Once you define your requests, using them from within a fragment or activity is painless unlike parallel AsyncTasks
Pros and cons of Volley:
So what’s nice about Volley?
The networking part isn’t just for images. Volley is intended to be
an integral part of your back end. For a fresh project based off of a
simple REST service, this could be a big win.
NetworkImageView is more aggressive about request cleanup than
Picasso, and more conservative in its GC usage patterns.
NetworkImageView relies exclusively on strong memory references, and
cleans up all request data as soon as a new request is made for an
ImageView, or as soon as that ImageView moves offscreen.
Performance. This post won’t evaluate this claim, but they’ve clearly
taken some care to be judicious in their memory usage patterns.
Volley also makes an effort to batch callbacks to the main thread to
reduce context switching.
Volley apparently has futures, too. Check out RequestFuture if you’re
interested.
If you’re dealing with high-resolution compressed images, Volley is
the only solution here that works well.
Volley can be used with Okhttp (New version of Okhttp supports NIO for better performance )
Volley plays nice with the Activity life cycle.
Problems With Volley:
Since Volley is new, few things are not supported yet, but it's fixed.
Multipart Requests (Solution: https://github.com/vinaysshenoy/enhanced-volley)
status code 201 is taken as an error, Status code from 200 to 207 are successful responses now.(Fixed: https://github.com/Vinayrraj/CustomVolley)
Update: in latest release of Google volley, the 2XX Status codes bug is fixed now!Thanks to Ficus Kirkpatrick!
it's less documented but many of the people are supporting volley in github, java like documentation can be found here.
On android developer website, you may find guide for Transmitting Network Data Using Volley. And volley source code can be found at Google Git
To solve/change Redirect Policy of Volley Framework use Volley with OkHTTP (CommonsWare mentioned above)
Also you can read this Comparing Volley's image loading with Picasso
Retrofit:
It's released by Square, This offers very easy to use REST API's (Update: Voila! with NIO support)
Pros of Retrofit:
Compared to Volley, Retrofit's REST API code is brief and provides
excellent API documentation and has good support in communities!
It is very easy to add into the projects.
We can use it with any serialization library, with error handling.
Update:
There are plenty of very good changes in Retrofit 2.0.0-beta2
version 1.6 of Retrofit with OkHttp 2.0 is now dependent on Okio to support java.io and java.nio which makes it much easier to access, store and process your data using ByteString and Buffer to do some clever things to save CPU and memory. (FYI: This reminds me of the Koush's OIN library with NIO support!)
We can use Retrofit together with RxJava to combine and chain REST calls using rxObservables to avoid ugly callback chains (to avoid callback hell!!).
Cons of Retrofit for version 1.6:
Memory related error handling functionality is not good (in older versions of Retrofit/OkHttp) not sure if it's improved with the Okio with Java NIO support.
Minimum threading assistance can result call back hell if we use this
in an improper way.
(All above Cons have been solved in the new version of Retrofit 2.0 beta)
========================================================================
Update:
Android Async vs Volley vs Retrofit performance benchmarks (milliseconds, lower value is better):
Library
One Discussion
Dashboard (7 requests)
25 Discussions
AsyncTask
941 ms
4,539 ms
13,957 ms
Volley
560 ms
2,202 ms
4,275 ms
Retrofit
312 ms
889 ms
1,059 ms
(FYI above Retrofit Benchmarks info will improve with java NIO support because the new version of OKhttp is dependent on NIO Okio library)
In all three tests with varying repeats (1 – 25 times), Volley was
anywhere from 50% to 75% faster. Retrofit clocked in at an impressive
50% to 90% faster than the AsyncTasks, hitting the same endpoint the
same number of times. On the Dashboard test suite, this translated
into loading/parsing the data several seconds faster. That is a
massive real-world difference. In order to make the tests fair, the
times for AsyncTasks/Volley included the JSON parsing as Retrofit does
it for you automatically.
RetroFit Wins in benchmark test!
In the end, we decided to go with Retrofit for our application. Not
only is it ridiculously fast, but it meshes quite well with our
existing architecture. We were able to make a parent Callback
Interface that automatically performs error handling, caching, and
pagination with little to no effort for our APIs. In order to merge in
Retrofit, we had to rename our variables to make our models GSON
compliant, write a few simple interfaces, delete functions from the
old API, and modify our fragments to not use AsyncTasks. Now that we
have a few fragments completely converted, it’s pretty painless. There
were some growing pains and issues that we had to overcome, but
overall it went smoothly. In the beginning, we ran into a few
technical issues/bugs, but Square has a fantastic Google+ community
that was able to help us through it.
When to use Volley?!
We can use Volley when we need to load images as well as consuming REST APIs!, network call queuing system is needed for many n/w request at the same time! also Volley has better memory related error handling than Retrofit!
OkHttp can be used with Volley, Retrofit uses OkHttp by default! It has SPDY support, connection pooling, disk caching, transparent compression! Recently, it has got some support of java NIO with Okio library.
Source, credit: volley-vs-retrofit by Mr. Josh Ruesch
Note: About streaming it depends on what type of streaming you want like RTSP/RTCP.

RoboSpice Vs. Volley
From https://groups.google.com/forum/#!topic/robospice/QwVCfY_glOQ
RoboSpice(RS) is service based and more respectful of Android philosophy than Volley. Volley is thread based and this is not the way background processing should take place on Android. Ultimately, you can dig down both libs and find that they are quite similar, but our way to do background processing is more Android oriented, it allow us, for instance, to tell users that RS is actually doing something in background, which would be hard for volley (actually it doesn't at all).
RoboSpice and volley both offer nice features like prioritization, retry policies, request cancellation. But RS offers more : a more advanced caching and that's a big one, with cache management, request aggregation, more features like repluging to a pending request, dealing with cache expiry without relying on server headers, etc.
RoboSpice does more outside of UI Thread : volley will deserialize your POJOs on the main thread, which is horrible to my mind. With RS your app will be more responsive.
In terms of speed, we definitely need metrics. RS has gotten super fast now, but still we don't have figure to put here. Volley should theoretically be a bit faster, but RS is now massively parallel... who knows ?
RoboSpice offers a large compatibility range with extensions. You can use it with okhttp, retrofit, ormlite (beta), jackson, jackson2, gson, xml serializer, google http client, spring android... Quite a lot. Volley can be used with ok http and uses gson. that's it.
Volley offers more UI sugar that RS. Volley provides NetworkImageView, RS does provide a spicelist adapter. In terms of feature it's not so far, but I believe Volley is more advanced on this topic.
More than 200 bugs have been solved in RoboSpice since its initial release. It's pretty robust and used heavily in production. Volley is less mature but its user base should be growing fast (Google effect).
RoboSpice is available on maven central. Volley is hard to find ;)

AFNetworking for Android:
Fast Android Networking is here
Fast Android Networking Library supports all types of HTTP/HTTPS request like GET, POST, DELETE, HEAD, PUT, PATCH
Fast Android Networking Library supports downloading any type of file
Fast Android Networking Library supports uploading any type of file (supports multipart upload)
Fast Android Networking Library supports cancelling a request
Fast Android Networking Library supports setting priority to any request (LOW, MEDIUM, HIGH, IMMEDIATE)
Fast Android Networking Library supports RxJava
As it uses OkHttp as a networking layer, it supports:
Fast Android Networking Library supports HTTP/2 support allows all requests to the same host to share a socket
Fast Android Networking Library uses connection pooling which reduces request latency (if HTTP/2 isn’t available)
Transparent GZIP shrinks download sizes
Fast Android Networking Library supports response caching which avoids the network completely for repeat requests
Thanks: The library is created by me

Async HTTP client loopj vs. Volley
The specifics of my project are small HTTP REST requests, every 1-5 minutes.
I using an async HTTP client (1.4.1) for a long time. The performance is better than using the vanilla Apache httpClient or an HTTP URL connection. Anyway, the new version of the library is not working for me: library inter exception cut chain of callbacks.
Reading all answers motivated me to try something new. I have chosen the Volley HTTP library.
After using it for some time, even without tests, I see clearly that the response time is down to 1.5x, 2x Volley.
Maybe Retrofit is better than an async HTTP client? I need to try it.
But I'm sure that Volley is not for me.

Just to add a bit to the discussion from my experience working with Volley:
Volley does not handle streaming uploads or downloads in any sense. That is, the entire request body has to be in memory and you cannot use an OutputStream to write the request body to the underlying socket, nor can you use an InputStream to read the response body, as basic HttpURLConnection does. So, Volley is a poor choice for uploading or downloading large files. Your requests and responses should be small. This is one of the biggest limitations of Volley that I have personally encountered. For what it's worth, OkHttp does have interfaces for working with streams.
The lack of official documentation is annoying, although I have been able to work around that by reading the source code, which is pretty easy to follow. What is more bothersome is that, as far as I can tell, Volley has no official release versions and no Maven or Gradle artifact, and therefore managing it as a dependency becomes more of a headache than, say, any of the libraries Square has released. You just clone a repo, build a jar, and you're on your own. Looking for a bug fix? Fetch and hope it's there. You might get some other stuff, too; it won't be documented. In my opinion, this effectively means that Volley is an unsupported 3rd party library, even though the code base is reasonably active. Caveat emptor.
As a nit, having the Content-Type tied to the class/request type (JsonObjectRequest, ImageRequest, etc.) is kind of awkward and reduces the flexibility of the calling code a bit, as you are tied to Volley's existing Request type hierarchy. I like the straightforwardness of just setting Content-Type as a header like any other (don't do this with Volley, by the way; you'll end up with two Content-Type headers!). That's just my personal opinion, though, and it can be worked around.
That is not to say that Volley does not have some useful features. It certainly does. Easily customizable retry policies, transparent caching, a cancellation API, and support for request scheduling and concurrent connections are great features. Just know that it's not intended for all HTTP use cases (see item 1 above), and that there are some headaches involved in putting Volley into production use in your app (item 2).

I've recently found a lib called ion that brings a little extra to the table.
ion has built-in support for image download integrated with ImageView, JSON (with the help of GSON), files and a very handy UI threading support.
I'm using it on a new project and so far the results have been good. Its use is much simpler than Volley or Retrofit.

Adding to the accepted answer and what LOG_TAG said....for Volley to parse your data in a background thread you must subclass Request<YourClassName> as the onResponse method is called on the main thread and parsing on the main thread may cause the UI to lag if your response is big.
Read here on how to do that.

Retrofit 1.9.0 vs. RoboSpice
I am using both in my app.
Robospice works faster than Retrofit whenever I parse the nested JSON class. Because Spice Manger will do everything for you. In Retrofit you need to create GsonConverter and deserialize it.
I created two fragments in the same activity and called the same time with two same kind of URLs.
09-23 20:12:32.830 16002-16002/com.urbanpro.seeker E/RETROFIT﹕ RestAdapter Init
09-23 20:12:32.833 16002-16002/com.urbanpro.seeker E/RETROFIT﹕ calling the method
09-23 20:12:32.837 16002-16002/com.urbanpro.seeker E/ROBOSPICE﹕ initialzig spice manager
09-23 20:12:32.860 16002-16002/com.urbanpro.seeker E/ROBOSPICE﹕ Executing the method
09-23 20:12:33.537 16002-16002/com.urbanpro.seeker E/ROBOSPICE﹕ on SUcceess
09-23 20:12:33.553 16002-16002/com.urbanpro.seeker E/ROBOSPICE﹕ gettting the all contents
09-23 20:12:33.601 16002-21819/com.urbanpro.seeker E/RETROFIT﹕ deseriazation starts
09-23 20:12:33.603 16002-21819/com.urbanpro.seeker E/RETROFIT﹕ deseriazation ends

And yet another option:
https://github.com/apptik/jus
It is modular like Volley, but more extended and documentation is improving, supporting different HTTP stacks and converters out of the box
It has a module to generate server API interface mappings like Retrofit
It also has JavaRx support
And many other handy features like markers, transformers, etc.

Which API or library should I use to get a JSON object

I want to pull a JSON object down from the internet. I've seen numerous examples for HTTP Client but I read from the documentation that
Android 6.0 release removes support for the Apache HTTP client. If your app is using this client and targets Android 2.3 (API level 9) or higher, use the HttpURLConnection class instead. This API is more efficient because it reduces network use through transparent compression and response caching, and minimizes power consumption. To continue using the Apache HTTP APIs, you must first declare the following compile-time dependency in your build.gradle file:
So should I be using HttpURLConnection because I found that some people are using a library called Volley.

If you are really not doing any heavy lifting in your application like downloading videos etc, google android volley is your best choice right now.
Volley is a networking library developed by Google and introduced during Google I/O 2013. It was developed because of the absence, in the Android SDK, of a networking class capable of working without interfering with the user experience.
WHY VOLLEY?
Avoid HttpUrlConnection and HttpClient. These classes are really difficult to use and are not really without bugs.
Avoid AsyncTask
It provides cancellation APIs
It is much faster
It caches everything
It has small metadata operations
Moreover if you have already used the AsyncTask, you will find volley really similar and even easier. Volley helps a lot to avoid the deadly NullPointerException.
Some time ago, the Google+ team did a series of performance tests on each of the different methods you can use to make network requests on Android. Volley got a score up to ten times better than the other alternatives when used in RESTful applications.
It is not so good, however, when employed for streaming operations and large downloads.

Yes, you must use HttpUrlConnection. No doubt, you can use any library like Volley, Retrofit etc. But they are also using the same thing.
Documentation for HttpUrlConnection.

I have used retrofit with GSON "As a parser" saved me a lot of time Volley is great too

Google Volley vs Android-Async-Http

I am looking into both these Android Http Networking libraries.
I would like some peoples experiences with using the two libraries. Personally I have always used the http://loopj.com/android-async-http/ library quite happily. But it was recently suggested to me to use the Volley Framework.
What benefits will I get from one over the other?
From my reading so far, Volley incorporates a number of nice features such as Image Loading, Request Caching, Request Cancelling all in one library.
My current use case / specifications:
Consume web services from my android applications.
Receive JSON Objects from web service
Easy To integrate with the GUI
Stability and Reliability over raw performance
Long term maintenance and support of the library.
Ease of use / ease of implementation
From some reading up on SE:
"Volley is all good but, On the minus side, it is one undocumented, unsupported, "throw the code over the wall and do an I|O presentation on it" library."
So I think its clear Volley might get the tick for features, But how well documented and maintained is it? If I decide to use it will there still be support for it 4 years down the line?

Volley and Android Async Http are different things.
Android Async Http: Is a powerful Http client. Offers some functionalities as REST helper and integration for JSON parsing with other libraries.
Volley: Is a REST helper/library that helps you to deal with async requests and image loading. Volley it's not an http client. Volley uses the SDK http clients (the apache or the httpclient depending on the API level) if you don't provide one, but a common client for volley is OkHttp (https://goo.gl/nl2DfN). You can integrate Volley with Gson easily as well.
From my point of view, as much responsibility you give to a single library, less customization you have and more unneeded code you'll add. That's the reason libraries as Android Async Http or ION are losing grip nowadays and other options like the Square solutions (Okio + OkHttp + Retrofit + Moshi + Picasso - Those are five libraries) are gaining grip. So here you have 5 libraries that can be used separately as standalone or tied together as 2, 3 or 4. That's flexibility and power.
For further reading on this take a look at this answer.

We are currently using a combination of Volley and GSON in our application. There is nothing we haven't been able to do, and we use just about every type of HTTP request you can imagine. This currently includes:
Normal HTTP requests with JSON response
POST requests with form encoded data as well as raw byte arrays
Multipart HTTP requests with large objects such as images and files
Custom request headers
Internationalized requests
We have yet to run into a roadblock we could not overcome, though we had to write a fair amount of code to support all these features and build the framework we wanted, but that should be expected with any HTTP library.
Also Volley comes with an ImageLoader which handles caching of images, as well as a bunch of other nifty features.

Difference between Android Volley and AsyncTask
Try this link http://www.truiton.com/2015/02/android-volley-vs-asynctask-better-approach/
Using AsyncTask has been a good approach, but consider Android Volley as a 2.0 version of it. It has many improvements over AsyncTask, as volley is designed for the purpose of network access. A major advantage of Android Volley over AsyncTask is that you can do multiple requests simultaneously without the overhead of thread management. Also I believe retry mechanism is a great feature of volley which gives it an edge over AsynTask. Another advantage of volley over AsyncTask is that it provides you with multiple request types, through which complex requests can be made easily. On the other hand while using AsyncTasks one would have to create this type of request manually.
Although best approach differs from application to application. Like if you have less no of requests to make, you can use AsyncTask. As for volley, one has to import a library project which increases your project size. Hence pick wisely between volley and AsyncTask. Hope this Android Volley vs AsyncTask sum up helped you choose.

Comparison of Android networking libraries: OkHTTP, Retrofit, and Volley [closed]

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We don’t allow questions seeking recommendations for books, tools, software libraries, and more. You can edit the question so it can be answered with facts and citations.
Closed 6 years ago.
Improve this question
Two-part question from an iOS developer learning Android, working on an Android project that will make a variety of requests from JSON to image to streaming download of audio and video:
On iOS I have used the AFNetworking project extensively. Is there an equivalent library for Android?
I've read up on OkHTTP and Retrofit by Square, as well as Volley but dont yet have experience developing with them. I'm hoping someone can provide some concrete examples of best use cases for each. From what I've read, seems like OkHTTP is the most robust of the three, and could handle the requirements of this project (mentioned above).

I'm hoping someone can provide some concrete examples of best use cases for each.
Use Retrofit if you are communicating with a Web service. Use the peer library Picasso if you are downloading images. Use OkHTTP if you need to do HTTP operations that lie outside of Retrofit/Picasso.
Volley roughly competes with Retrofit + Picasso. On the plus side, it is one library. On the minus side, it is one undocumented, an unsupported, "throw the code over the wall and do an I|O presentation on it" library.
EDIT - Volley is now officially supported by Google. Kindly refer Google Developer Guide
From what I've read, seems like OkHTTP is the most robust of the 3
Retrofit uses OkHTTP automatically if available. There is a Gist from Jake Wharton that connects Volley to OkHTTP.
and could handle the requirements of this project (mentioned above).
Probably you will use none of them for "streaming download of audio and video", by the conventional definition of "streaming". Instead, Android's media framework will handle those HTTP requests for you.
That being said, if you are going to attempt to do your own HTTP-based streaming, OkHTTP should handle that scenario; I don't recall how well Volley would handle that scenario. Neither Retrofit nor Picasso are designed for that.

Looking at the Volley perspective here are some advantages for your requirement:
Volley, on one hand, is totally focused on handling individual, small HTTP requests. So if your HTTP request handling has some quirks, Volley probably has a hook for you. If, on the other hand, you have a quirk in your image handling, the only real hook you have is ImageCache. "It’s not nothing, but it’s not a lot!, either". but it has more other advantages like Once you define your requests, using them from within a fragment or activity is painless unlike parallel AsyncTasks
Pros and cons of Volley:
So what’s nice about Volley?
The networking part isn’t just for images. Volley is intended to be
an integral part of your back end. For a fresh project based off of a
simple REST service, this could be a big win.
NetworkImageView is more aggressive about request cleanup than
Picasso, and more conservative in its GC usage patterns.
NetworkImageView relies exclusively on strong memory references, and
cleans up all request data as soon as a new request is made for an
ImageView, or as soon as that ImageView moves offscreen.
Performance. This post won’t evaluate this claim, but they’ve clearly
taken some care to be judicious in their memory usage patterns.
Volley also makes an effort to batch callbacks to the main thread to
reduce context switching.
Volley apparently has futures, too. Check out RequestFuture if you’re
interested.
If you’re dealing with high-resolution compressed images, Volley is
the only solution here that works well.
Volley can be used with Okhttp (New version of Okhttp supports NIO for better performance )
Volley plays nice with the Activity life cycle.
Problems With Volley:
Since Volley is new, few things are not supported yet, but it's fixed.
Multipart Requests (Solution: https://github.com/vinaysshenoy/enhanced-volley)
status code 201 is taken as an error, Status code from 200 to 207 are successful responses now.(Fixed: https://github.com/Vinayrraj/CustomVolley)
Update: in latest release of Google volley, the 2XX Status codes bug is fixed now!Thanks to Ficus Kirkpatrick!
it's less documented but many of the people are supporting volley in github, java like documentation can be found here.
On android developer website, you may find guide for Transmitting Network Data Using Volley. And volley source code can be found at Google Git
To solve/change Redirect Policy of Volley Framework use Volley with OkHTTP (CommonsWare mentioned above)
Also you can read this Comparing Volley's image loading with Picasso
Retrofit:
It's released by Square, This offers very easy to use REST API's (Update: Voila! with NIO support)
Pros of Retrofit:
Compared to Volley, Retrofit's REST API code is brief and provides
excellent API documentation and has good support in communities!
It is very easy to add into the projects.
We can use it with any serialization library, with error handling.
Update:
There are plenty of very good changes in Retrofit 2.0.0-beta2
version 1.6 of Retrofit with OkHttp 2.0 is now dependent on Okio to support java.io and java.nio which makes it much easier to access, store and process your data using ByteString and Buffer to do some clever things to save CPU and memory. (FYI: This reminds me of the Koush's OIN library with NIO support!)
We can use Retrofit together with RxJava to combine and chain REST calls using rxObservables to avoid ugly callback chains (to avoid callback hell!!).
Cons of Retrofit for version 1.6:
Memory related error handling functionality is not good (in older versions of Retrofit/OkHttp) not sure if it's improved with the Okio with Java NIO support.
Minimum threading assistance can result call back hell if we use this
in an improper way.
(All above Cons have been solved in the new version of Retrofit 2.0 beta)
========================================================================
Update:
Android Async vs Volley vs Retrofit performance benchmarks (milliseconds, lower value is better):
Library
One Discussion
Dashboard (7 requests)
25 Discussions
AsyncTask
941 ms
4,539 ms
13,957 ms
Volley
560 ms
2,202 ms
4,275 ms
Retrofit
312 ms
889 ms
1,059 ms
(FYI above Retrofit Benchmarks info will improve with java NIO support because the new version of OKhttp is dependent on NIO Okio library)
In all three tests with varying repeats (1 – 25 times), Volley was
anywhere from 50% to 75% faster. Retrofit clocked in at an impressive
50% to 90% faster than the AsyncTasks, hitting the same endpoint the
same number of times. On the Dashboard test suite, this translated
into loading/parsing the data several seconds faster. That is a
massive real-world difference. In order to make the tests fair, the
times for AsyncTasks/Volley included the JSON parsing as Retrofit does
it for you automatically.
RetroFit Wins in benchmark test!
In the end, we decided to go with Retrofit for our application. Not
only is it ridiculously fast, but it meshes quite well with our
existing architecture. We were able to make a parent Callback
Interface that automatically performs error handling, caching, and
pagination with little to no effort for our APIs. In order to merge in
Retrofit, we had to rename our variables to make our models GSON
compliant, write a few simple interfaces, delete functions from the
old API, and modify our fragments to not use AsyncTasks. Now that we
have a few fragments completely converted, it’s pretty painless. There
were some growing pains and issues that we had to overcome, but
overall it went smoothly. In the beginning, we ran into a few
technical issues/bugs, but Square has a fantastic Google+ community
that was able to help us through it.
When to use Volley?!
We can use Volley when we need to load images as well as consuming REST APIs!, network call queuing system is needed for many n/w request at the same time! also Volley has better memory related error handling than Retrofit!
OkHttp can be used with Volley, Retrofit uses OkHttp by default! It has SPDY support, connection pooling, disk caching, transparent compression! Recently, it has got some support of java NIO with Okio library.
Source, credit: volley-vs-retrofit by Mr. Josh Ruesch
Note: About streaming it depends on what type of streaming you want like RTSP/RTCP.

RoboSpice Vs. Volley
From https://groups.google.com/forum/#!topic/robospice/QwVCfY_glOQ
RoboSpice(RS) is service based and more respectful of Android philosophy than Volley. Volley is thread based and this is not the way background processing should take place on Android. Ultimately, you can dig down both libs and find that they are quite similar, but our way to do background processing is more Android oriented, it allow us, for instance, to tell users that RS is actually doing something in background, which would be hard for volley (actually it doesn't at all).
RoboSpice and volley both offer nice features like prioritization, retry policies, request cancellation. But RS offers more : a more advanced caching and that's a big one, with cache management, request aggregation, more features like repluging to a pending request, dealing with cache expiry without relying on server headers, etc.
RoboSpice does more outside of UI Thread : volley will deserialize your POJOs on the main thread, which is horrible to my mind. With RS your app will be more responsive.
In terms of speed, we definitely need metrics. RS has gotten super fast now, but still we don't have figure to put here. Volley should theoretically be a bit faster, but RS is now massively parallel... who knows ?
RoboSpice offers a large compatibility range with extensions. You can use it with okhttp, retrofit, ormlite (beta), jackson, jackson2, gson, xml serializer, google http client, spring android... Quite a lot. Volley can be used with ok http and uses gson. that's it.
Volley offers more UI sugar that RS. Volley provides NetworkImageView, RS does provide a spicelist adapter. In terms of feature it's not so far, but I believe Volley is more advanced on this topic.
More than 200 bugs have been solved in RoboSpice since its initial release. It's pretty robust and used heavily in production. Volley is less mature but its user base should be growing fast (Google effect).
RoboSpice is available on maven central. Volley is hard to find ;)

AFNetworking for Android:
Fast Android Networking is here
Fast Android Networking Library supports all types of HTTP/HTTPS request like GET, POST, DELETE, HEAD, PUT, PATCH
Fast Android Networking Library supports downloading any type of file
Fast Android Networking Library supports uploading any type of file (supports multipart upload)
Fast Android Networking Library supports cancelling a request
Fast Android Networking Library supports setting priority to any request (LOW, MEDIUM, HIGH, IMMEDIATE)
Fast Android Networking Library supports RxJava
As it uses OkHttp as a networking layer, it supports:
Fast Android Networking Library supports HTTP/2 support allows all requests to the same host to share a socket
Fast Android Networking Library uses connection pooling which reduces request latency (if HTTP/2 isn’t available)
Transparent GZIP shrinks download sizes
Fast Android Networking Library supports response caching which avoids the network completely for repeat requests
Thanks: The library is created by me

Async HTTP client loopj vs. Volley
The specifics of my project are small HTTP REST requests, every 1-5 minutes.
I using an async HTTP client (1.4.1) for a long time. The performance is better than using the vanilla Apache httpClient or an HTTP URL connection. Anyway, the new version of the library is not working for me: library inter exception cut chain of callbacks.
Reading all answers motivated me to try something new. I have chosen the Volley HTTP library.
After using it for some time, even without tests, I see clearly that the response time is down to 1.5x, 2x Volley.
Maybe Retrofit is better than an async HTTP client? I need to try it.
But I'm sure that Volley is not for me.

Just to add a bit to the discussion from my experience working with Volley:
Volley does not handle streaming uploads or downloads in any sense. That is, the entire request body has to be in memory and you cannot use an OutputStream to write the request body to the underlying socket, nor can you use an InputStream to read the response body, as basic HttpURLConnection does. So, Volley is a poor choice for uploading or downloading large files. Your requests and responses should be small. This is one of the biggest limitations of Volley that I have personally encountered. For what it's worth, OkHttp does have interfaces for working with streams.
The lack of official documentation is annoying, although I have been able to work around that by reading the source code, which is pretty easy to follow. What is more bothersome is that, as far as I can tell, Volley has no official release versions and no Maven or Gradle artifact, and therefore managing it as a dependency becomes more of a headache than, say, any of the libraries Square has released. You just clone a repo, build a jar, and you're on your own. Looking for a bug fix? Fetch and hope it's there. You might get some other stuff, too; it won't be documented. In my opinion, this effectively means that Volley is an unsupported 3rd party library, even though the code base is reasonably active. Caveat emptor.
As a nit, having the Content-Type tied to the class/request type (JsonObjectRequest, ImageRequest, etc.) is kind of awkward and reduces the flexibility of the calling code a bit, as you are tied to Volley's existing Request type hierarchy. I like the straightforwardness of just setting Content-Type as a header like any other (don't do this with Volley, by the way; you'll end up with two Content-Type headers!). That's just my personal opinion, though, and it can be worked around.
That is not to say that Volley does not have some useful features. It certainly does. Easily customizable retry policies, transparent caching, a cancellation API, and support for request scheduling and concurrent connections are great features. Just know that it's not intended for all HTTP use cases (see item 1 above), and that there are some headaches involved in putting Volley into production use in your app (item 2).

I've recently found a lib called ion that brings a little extra to the table.
ion has built-in support for image download integrated with ImageView, JSON (with the help of GSON), files and a very handy UI threading support.
I'm using it on a new project and so far the results have been good. Its use is much simpler than Volley or Retrofit.

Adding to the accepted answer and what LOG_TAG said....for Volley to parse your data in a background thread you must subclass Request<YourClassName> as the onResponse method is called on the main thread and parsing on the main thread may cause the UI to lag if your response is big.
Read here on how to do that.

Retrofit 1.9.0 vs. RoboSpice
I am using both in my app.
Robospice works faster than Retrofit whenever I parse the nested JSON class. Because Spice Manger will do everything for you. In Retrofit you need to create GsonConverter and deserialize it.
I created two fragments in the same activity and called the same time with two same kind of URLs.
09-23 20:12:32.830 16002-16002/com.urbanpro.seeker E/RETROFIT﹕ RestAdapter Init
09-23 20:12:32.833 16002-16002/com.urbanpro.seeker E/RETROFIT﹕ calling the method
09-23 20:12:32.837 16002-16002/com.urbanpro.seeker E/ROBOSPICE﹕ initialzig spice manager
09-23 20:12:32.860 16002-16002/com.urbanpro.seeker E/ROBOSPICE﹕ Executing the method
09-23 20:12:33.537 16002-16002/com.urbanpro.seeker E/ROBOSPICE﹕ on SUcceess
09-23 20:12:33.553 16002-16002/com.urbanpro.seeker E/ROBOSPICE﹕ gettting the all contents
09-23 20:12:33.601 16002-21819/com.urbanpro.seeker E/RETROFIT﹕ deseriazation starts
09-23 20:12:33.603 16002-21819/com.urbanpro.seeker E/RETROFIT﹕ deseriazation ends

And yet another option:
https://github.com/apptik/jus
It is modular like Volley, but more extended and documentation is improving, supporting different HTTP stacks and converters out of the box
It has a module to generate server API interface mappings like Retrofit
It also has JavaRx support
And many other handy features like markers, transformers, etc.