Android AsyncHttpClient
2014-07-09 11:01
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Android Asynchronous Http Client
A Callback-Based Http Client Library for Android
TweetDownloadversion
1.4.2 (latest)
or fork me on github
Overview
An asynchronous callback-based Http client for Android built on top of Apache’s HttpClient libraries. All requests are made outside of your app’s main UIthread, but any callback logic will be executed on the same thread as the callback was created using Android’s Handler message passing.
Features
Make asynchronous HTTP requests, handle responses in anonymouscallbacks
HTTP requests happen outside the UI thread
Requests use a threadpool to cap concurrent resource usage
GET/POST params builder (RequestParams)
Multipart file uploads with no additional third party libraries
Tiny size overhead to your application, only 25kb for everything
Automatic smart request retries optimized for spotty mobile connections
Automatic gzip response decoding support for super-fast requests
Binary file (images etc) downloading with
BinaryHttpResponseHandler
Built-in response parsing into JSON with
JsonHttpResponseHandler
Persistent cookie store, saves cookies into your app’s SharedPreferences
Who is Using It?
InstagramInstagram is the #1 photo app on android, with over 10million users
Heyzap
Social game discovery app with millions of users
DoubanFM
Popular personal online music radio service
Pose
Pose is the #1 fashion app for sharing and discovering new styles
Pocket Salsa
Pocket Salsa is the easiest way to learn how to dance salsa.
Send me a message on github to let me know if you are using this library in a released android application!
Installation & Basic Usage
Download the latest .jar file from github and place it in your Android app’s libs/folder.
Import the http package.
import com.loopj.android.http.*;
Create a new
AsyncHttpClientinstance and make a request:
AsyncHttpClient client = new AsyncHttpClient(); client.get("http://www.google.com", new AsyncHttpResponseHandler() { @Override public void onSuccess(String response) { System.out.println(response); } });
Recommended Usage: Make a Static Http Client
In this example, we’ll make a http client class with static accessors to make it easy to communicate with Twitter’s API.import com.loopj.android.http.*;
public class TwitterRestClient {
private static final String BASE_URL = "http://api.twitter.com/1/";
private static AsyncHttpClient client = new AsyncHttpClient();
public static void get(String url, RequestParams params, AsyncHttpResponseHandler responseHandler) {
client.get(getAbsoluteUrl(url), params, responseHandler);
}
public static void post(String url, RequestParams params, AsyncHttpResponseHandler responseHandler) {
client.post(getAbsoluteUrl(url), params, responseHandler);
}
private static String getAbsoluteUrl(String relativeUrl) {
return BASE_URL + relativeUrl;
}
}
This then makes it very easy to work with the Twitter API in your code:
import org.json.*;
import com.loopj.android.http.*;
class TwitterRestClientUsage {
public void getPublicTimeline() throws JSONException {
TwitterRestClient.get("statuses/public_timeline.json", null, new JsonHttpResponseHandler() {
@Override
public void onSuccess(JSONArray timeline) {
// Pull out the first event on the public timeline
JSONObject firstEvent = timeline.get(0);
String tweetText = firstEvent.getString("text");
// Do something with the response
System.out.println(tweetText);
}
});
}
}
Check out the AsyncHttpClient, RequestParams and AsyncHttpResponseHandlerJavadocs
for more details.
Persistent Cookie Storage with PersistentCookieStore
This library also includes a PersistentCookieStorewhich is an implementation of the Apache HttpClient
CookieStoreinterface
that automatically saves cookies to
SharedPreferencesstorage on the Android device.
This is extremely useful if you want to use cookies to manage authentication sessions, since the user will remain logged in even after closing and re-opening your app.
First, create an instance of
AsyncHttpClient:
AsyncHttpClient myClient = new AsyncHttpClient();
Now set this client’s cookie store to be a new instance of
PersistentCookieStore, constructed with an activity or application
context (usually
thiswill suffice):
PersistentCookieStore myCookieStore = new PersistentCookieStore(this); myClient.setCookieStore(myCookieStore);
Any cookies received from servers will now be stored in the persistent cookie store.
To add your own cookies to the store, simply construct a new cookie and call
addCookie:
BasicClientCookie newCookie = new BasicClientCookie("cookiesare", "awesome"); newCookie.setVersion(1); newCookie.setDomain("mydomain.com"); newCookie.setPath("/"); myCookieStore.addCookie(newCookie);
See the PersistentCookieStore Javadoc for more information.
Adding GET/POST Parameters with RequestParams
The RequestParamsclass is used to add optional GET or POST parameters to your requests.
RequestParamscan
be built and constructed in various ways:
Create empty
RequestParamsand immediately add some parameters:
RequestParams params = new RequestParams(); params.put("key", "value"); params.put("more", "data");
Create
RequestParamsfor a single parameter:
RequestParams params = new RequestParams("single", "value");
Create
RequestParamsfrom an existing
Mapof
key/value strings:
HashMap<String, String> paramMap = new HashMap<String, String>(); paramMap.put("key", "value"); RequestParams params = new RequestParams(paramMap);
See the RequestParams Javadoc for more information.
Uploading Files with RequestParams
The RequestParamsclass additionally supports multipart file uploads as follows:
Add an
InputStreamto the
RequestParamsto
upload:
InputStream myInputStream = blah; RequestParams params = new RequestParams(); params.put("secret_passwords", myInputStream, "passwords.txt");
Add a
Fileobject to the
RequestParamsto
upload:
File myFile = new File("/path/to/file.png"); RequestParams params = new RequestParams(); try { params.put("profile_picture", myFile); } catch(FileNotFoundException e) {}
Add a byte array to the
RequestParamsto upload:
byte[] myByteArray = blah; RequestParams params = new RequestParams(); params.put("soundtrack", new ByteArrayInputStream(myByteArray), "she-wolf.mp3");
See the RequestParams Javadoc for more information.
Downloading Binary Data with BinaryHttpResponseHandler
The BinaryHttpResponseHandlerclass can be used to fetch binary data such as images and other files. For example:
AsyncHttpClient client = new AsyncHttpClient(); String[] allowedContentTypes = new String[] { "image/png", "image/jpeg" }; client.get("http://example.com/file.png", new BinaryHttpResponseHandler(allowedContentTypes) { @Override public void onSuccess(byte[] fileData) { // Do something with the file } });
See the BinaryHttpResponseHandler Javadoc for more information.
Adding HTTP Basic Auth credentials
Some requests may need username/password credentials when dealing with API services that use HTTP Basic Access Authentication requests. You can use the method setBasicAuth()to
provide your credentials.
Set username/password for any host and realm for a particular request. By default the Authentication Scope is for any host, port and realm.
AsyncHttpClient client = new AsyncHttpClient(); client.setBasicAuth("username","password/token"); client.get("http://example.com");
You can also provide a more specific Authentication Scope (recommended)
AsyncHttpClient client = new AsyncHttpClient(); client.setBasicAuth("username","password", new AuthScope("example.com", 80, AuthScope.ANY_REALM)); client.get("http://example.com");
See the RequestParams Javadoc for more information.
Building from Source
To build a .jarfile from source, first make a clone of the android-async-http github repository. You’ll then need to
copy the
local.properties.distfile to
local.propertiesand
edit the
sdk.dirsetting to point to where you have the android sdk installed. You can then run:
ant package
This will generate a file named
android-async-http-version.jar.
Reporting Bugs or Feature Requests
Please report any bugs or feature requests on the github issues page for this project here:https://github.com/loopj/android-async-http/issues
Credits & Contributors
James Smith (http://github.com/loopj)Creator and Maintainer
Micah Fivecoate (http://github.com/m5)
Major Contributor, including the original
RequestParams
The Droid Fu Project (https://github.com/kaeppler/droid-fu)
Inspiration and code for better http retries
Rafael Sanches (http://blog.rafaelsanches.com)
Original
SimpleMultipartEntitycode
Anthony Persaud (http://github.com/apersaud)
Added support for HTTP Basic Authentication requests.
Linden Darling (http://github.com/coreform)
Added support for binary/image responses
License
The Android Asynchronous Http Client is released under the Android-friendly Apache License, Version 2.0. Read the full license here:http://www.apache.org/licenses/LICENSE-2.0
About the Author
James Smith, British entrepreneur and developer based in San Francisco.I'm the co-founder of Bugsnag with Simon Maynard, and from 2009 to 2012 I led up the product team as
CTO of Heyzap.
Follow @loopj
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