Android AsyncHttpClient

Android AsyncHttpClient

大家好,又见面了,我是全栈君,祝每个程序员都可以多学几门语言。

  

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 UI thread, 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 anonymous callbacks
  • 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?

Instagram
Instagram 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 AsyncHttpClient instance 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);
    }
});

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 AsyncHttpClientRequestParams and AsyncHttpResponseHandlerJavadocs for more details.

This library also includes a PersistentCookieStore which is an implementation of the Apache HttpClient CookieStore interface that automatically saves cookies to SharedPreferences storage 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 this will 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 RequestParams class is used to add optional GET or POST parameters to your requests.RequestParams can be built and constructed in various ways:

Create empty RequestParams and immediately add some parameters:

RequestParams params = new RequestParams();
params.put("key", "value");
params.put("more", "data");

Create RequestParams for a single parameter:

RequestParams params = new RequestParams("single", "value");

Create RequestParams from an existing Map of 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 RequestParams class additionally supports multipart file uploads as follows:

Add an InputStream to the RequestParams to upload:

InputStream myInputStream = blah;
RequestParams params = new RequestParams();
params.put("secret_passwords", myInputStream, "passwords.txt");

Add a File object to the RequestParams to 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 RequestParams to 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 BinaryHttpResponseHandler class 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 .jar file from source, first make a clone of the android-async-http github repository. You’ll then need to copy the local.properties.dist file to local.properties and edit the sdk.dir setting 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 
SimpleMultipartEntity code
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.

版权声明:本文内容由互联网用户自发贡献,该文观点仅代表作者本人。本站仅提供信息存储空间服务,不拥有所有权,不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容, 请发送邮件至 举报,一经查实,本站将立刻删除。

发布者:全栈程序员-用户IM,转载请注明出处:https://javaforall.cn/118596.html原文链接:https://javaforall.cn

【正版授权,激活自己账号】: Jetbrains全家桶Ide使用,1年售后保障,每天仅需1毛

【官方授权 正版激活】: 官方授权 正版激活 支持Jetbrains家族下所有IDE 使用个人JB账号...

(0)


相关推荐

  • shell检查语法模式

    shell检查语法模式方法sh-ntest.sh直接上例子

  • BigDecimal 除法

    BigDecimal 除法文章目录BigDecimal除法除法常用方法示例舍入模式ROUND_UPROUND_DOWNROUND_CEILINGROUND_FLOORROUND_HALF_UPROUND_HALF_DOWNROUND_HALF_EVENROUND_UNNECESSARYBigDecimal除法除法常用方法divide(BigDecimaldivisor,intscale,introundingMode)参数释义divisor被除数scale保留小数位roun

  • 常用vbs代码[通俗易懂]

    常用vbs代码[通俗易懂] 将域用户或组添加到本地组SetobjGroup=GetObject(“WinNT://./Administrators”)SetobjUser=GetObject(“WinNT://testnet/Engineers”)objGroup.Add(objUser.ADsPath)修改本地管理员密码Setobjcnlar=GetObject(“WinNT://./a

  • SVM——支持向量回归(SVR)[通俗易懂]

    SVM——支持向量回归(SVR)[通俗易懂]1、支持向量回归的原始问题先来看看SVM线性支持向量机(软间隔)的原始问题:其中ξi是松弛变量,但它实际上是hinge(合页)损失函数,所以ξi也作为对应的点(xi,yi)的损失,如下图所示:当点(xi,yi)位于间隔面上或者间隔面之外(这两种都是正确分类的情况)则ξi=0,若点(xi,yi)位于分割面上或者正确分类且位于间隔面之内或者位于分错的那一侧,这三种情况都是有损失的,损失…

  • 示波器的存储深度[通俗易懂]

    示波器的存储深度[通俗易懂]采集时间窗口=存储深度/采样率安捷伦的9000系列示波器在界面左上角上有显示采样率和存储深度,单位为MSa/s或者GSa/s已经Mpts,Mpts代表存储深度,pts是points的缩写,Mpts是指M个点。在每通道的存储深度为1Mpts的设置下,示波器可以10GSa/s采样率捕获1ms的波形。同一示波器,但每通道的存储深度是100Mpts的设置,那么在采样率相同的条件下可以捕获10ms…

  • pytest重试_pytest的conftest

    pytest重试_pytest的conftest安装:pip3installpytest-rerunfailures重新运行所有失败用例要重新运行所有测试失败的用例,请使用–reruns命令行选项,并指定要运行测试的最大次数:$py

发表回复

您的电子邮箱地址不会被公开。

关注全栈程序员社区公众号