Ion是一个Android异步网络和图像加载库，优雅得API大大简化了网络操作。
地址：https://github.com/koush/ion

特点：

异步下载：

Images into ImageViews or Bitmaps (animated GIFs supported too)
JSON (viaGson)
Strings
Files
Java types using Gson

易于使用地流式API

Automaticallycancelsoperations when the calling Activity finishes
Manages invocation back onto the UI thread
All operations return a Future and can be cancelled

HTTP POST/PUT:

text/plain
application/json -both JsonObject and POJO
application/x-www-form-urlencoded
multipart/form-data

Transparent usage of HTTP features and optimizations:

SPDY and HTTP/2
Caching
Gzip/Deflate Compression
Connection pooling/reusevia HTTP Connection: keep-alive
Uses the best/stablest connection from a server if it has multiple IP addresses
Cookies

Viewreceivedheaders
Grouping and cancellation of requests
Download progress callbacks
Supports file:/, http(s):/, and content:/ URIs
Request levelloggingand profiling
Support forproxyservers like Charles Proxy to do request analysis
Based on NIO and AndroidAsync
Ability to use self signedSSLcertificates
示例：https://github.com/koush/ion/tree/master/ion-sample

安装：

jar方式：

本身jar:ion.jar
Gson:gson.jar
AndroidAsync：https://github.com/koush/AndroidAsync

Maven：

<dependency><groupId>com.koushikdutta.ion</groupId><artifactId>ion</artifactId><version>2,</version></dependency>

Gradle：

dependencies{compile'com.koushikdutta.ion:ion:2.+'}

使用：

Get JSON

Ion.with(context).load("http://example.com/thing.json").asJsonObject().setCallback(newFutureCallback<JsonObject>(){@OverridepublicvoidonCompleted(Exceptione,JsonObjectresult){//dostuffwiththeresultorerror}});

Post JSON and read JSON

JsonObjectjson=newJsonObject();json.addProperty("foo","bar");Ion.with(context).load("http://example.com/post").setJsonObjectBody(json).asJsonObject().setCallback(newFutureCallback<JsonObject>(){@OverridepublicvoidonCompleted(Exceptione,JsonObjectresult){//dostuffwiththeresultorerror}});

Post application/x-www-form-urlencoded and read a String

Ion.with(getContext()).load("https://koush.clockworkmod.com/test/echo").setBodyParameter("goop","noop").setBodyParameter("foo","bar").asString().setCallback(...)

Post multipart/form-data and read JSON with an upload progress bar

Ion.with(getContext()).load("https://koush.clockworkmod.com/test/echo").uploadProgressBar(uploadProgressBar).setMultipartParameter("goop","noop").setMultipartFile("filename.zip",newFile("/sdcard/filename.zip")).asJsonObject().setCallback(...)

Download a File with a progress bar

Ion.with(context).load("http://example.com/really-big-file.zip")//haveaProgressBargetupdatedautomaticallywiththepercent.progressBar(progressBar)//andaProgressDialog.progressDialog(progressDialog)//canalsouseacustomcallback.progress(newProgressCallback(){@OverridepublicvoidonProgress(intdownloaded,inttotal){System.out.println(""+downloaded+"/"+total);}}).write(newFile("/sdcard/really-big-file.zip")).setCallback(newFutureCallback<File>(){@OverridepublicvoidonCompleted(Exceptione,Filefile){//downloaddone...//dostuffwiththeFileorerror}});

Setting Headers

Ion.with(context).load("http://example.com/test.txt")//settheheader.setHeader("foo","bar").asString().setCallback(...)

Load an image into an ImageView

//Thisisthe"long"waytodobuildanImageViewrequest...itallowsyoutosetheaders,etc.Ion.with(context).load("http://example.com/image.png").withBitmap().placeholder(R.drawable.placeholder_image).error(R.drawable.error_image).animateLoad(spinAnimation).animateIn(fadeInAnimation).intoImageView(imageView);//butforbrevity,usetheImageViewspecificbuilder...Ion.with(imageView).placeholder(R.drawable.placeholder_image).error(R.drawable.error_image).animateLoad(spinAnimation).animateIn(fadeInAnimation).load("http://example.com/image.png");

Ion图像加载API特点

Disk and memory caching
Bitmaps are held viaweak referencesso memory is managed very effeciently
ListView Adapterrecyclingsupport
Bitmaptransformationsvia the .transform(Transform)
Animateloading and loaded ImageViewstates
DeepZoomfor extremely large images

Futures

All operations return a custom Future that allows you to specify acallbackthat runs on completion.

Future<String>string=Ion.with(context).load("http://example.com/string.txt").asString();Future<JsonObject>json=Ion.with(context).load("http://example.com/json.json").asJsonObject();Future<File>file=Ion.with(context).load("http://example.com/file.zip").write(newFile("/sdcard/file.zip"));Future<Bitmap>bitmap=Ion.with(context).load("http://example.com/image.png").intoImageView(imageView);

Cancelling Requests

Futures can be cancelled by calling .cancel():

bitmap.cancel();json.cancel();

Blocking on Requests

All Futures have aFuture.get()method that waits for the result of the request, by blocking if necessary.

JsonObjectjson=Ion.with(context).load("http://example.com/thing.json").asJsonObject().get();

Seamlessly use your own Java classes with Gson（利用Gson无缝使用POJO）:

publicstaticclassTweet{publicStringid;publicStringtext;publicStringphoto;}publicvoidgetTweets()throwsException{Ion.with(context).load("http://example.com/api/tweets").as(newTypeToken<List<Tweet>>(){}).setCallback(newFutureCallback<List<Tweet>>(){@OverridepublicvoidonCompleted(Exceptione,List<Tweet>tweets){//chirpchirp}});}

Logging

Wondering why your app is slow? Ion lets you doboth global and request level logging.
To enable it globally:

Ion.getDefault(getContext()).configure().setLogging("MyLogs",Log.DEBUG);

Or to enable it on just a single request:

Ion.with(context).load("http://example.com/thing.json").setLogging("MyLogs",Log.DEBUG).asJsonObject();

Request Groups请求组合

By default, Ion automatically places all requests into a group with all the other requests created by that Activity or Service. Using thecancelAll(Activity)call, all requests still pending can be easilycancelled:

Future<JsonObject>json1=Ion.with(activity,"http://example.com/test.json").asJsonObject();Future<JsonObject>json2=Ion.with(activity,"http://example.com/test2.json").asJsonObject();//later...inactivity.onStop@OverrideprotectedvoidonStop(){super.onStop();Ion.getDefault(activity).cancelAll(activity);}

Ion also lets you tag your requests intogroupsto allow for easy cancellation of requests in that group later:
自定义Group便于管理：

ObjectjsonGroup=newObject();ObjectimageGroup=newObject();Future<JsonObject>json1=Ion.with(activity).load("http://example.com/test.json")//taginacustomgroup.group(jsonGroup).asJsonObject();Future<JsonObject>json2=Ion.with(activity).load("http://example.com/test2.json")//usethesamecustomgroupastheotherjsonrequest.group(jsonGroup).asJsonObject();Future<Bitmap>image1=Ion.with(activity).load("http://example.com/test.png")//forthisimagerequest,useadifferentgroupforimages.group(imageGroup).intoImageView(imageView1);Future<Bitmap>image2=Ion.with(activity).load("http://example.com/test2.png")//sameimageGroupasbefore.group(imageGroup).intoImageView(imageView2);//later...tocancelonlyimagedownloads:Ion.getDefault(activity).cancelAll(imageGroup);

Proxy Servers (like Charles Proxy)

//proxyallrequestsIon.getDefault(context).configure().proxy("mycomputer",8888);//or...toproxyspecificrequestsIon.with(context).load("http://example.com/proxied.html").proxy("mycomputer",8888).getString();

Viewing Received Headers

Ion operations return aResponseFuture, which grantaccess to response propertiesvia the Response object.The Response object contains the headers, as well as the result:ResponseFuture同时包含头部和请求结果

Ion.with(getContext()).load("http://example.com/test.txt").asString().withResponse().setCallback(newFutureCallback<Response<String>>(){@OverridepublicvoidonCompleted(Exceptione,Response<String>result){//printtheresponsecode,ie,200System.out.println(result.getHeaders().code());//printtheStringthatwasdownloadedSystem.out.println(result.getResult());}});

Android(安卓)ion异步网络和图像加载大大简化网络开发强烈推荐

特点：

安装：

使用：