简单介绍：
An asynchronous, callback-based Http client for Android built on top
of Apache‘s HttpClient libraries.即在Apache‘s
HttpClient 开源框架（该Apache‘s HttpClient 框架在eclipse里面不用导入额外的jar包，由于已经自带了）的基础上为android所设计的框架。
Features
- Make asynchronous HTTP requests, handle responses in anonymous callbacks
- 异步的HTTP请求，异步的响应回调
- HTTP requests happen outside the UI thread
- HTTP请求不在UI线程内。避免了ANR错误
- Requests use a threadpool to cap concurrent resource usage
- 通过threadpool实现Request，限制并发资源的使用
- GET/POST params builder (RequestParams)
- Multipart file uploads with no additional third party libraries
- Tiny size overhead to your application, only 19kb for everything
- Automatic smart request retries optimized for spotty mobile connections
- Automatic gzip response decoding support for super-fast requests
- Optional built-in response parsing into JSON (JsonHttpResponseHandler)
- Optional persistent cookie store, saves cookies into your app‘s SharedPreferences
- 可选择性的永久cookie保存。在你的SharedPreferences上保存cookies
可用在get/post提交数据上
Documentation,
Features and Examples
Full details and documentation can be found on the project page here:
http://loopj.com/android-async-http/
