开源框架Android Asynchronous Http Client

一、创建一个新的AsyncHttpClient的实例和请求
通过AsyncHttpClient类的实例就可以执行网络请求，包括get、put、post、head、delete。并指定一个ResponseHandlerInterface的实例接收请求结果。

AsyncHttpClient client = new AsyncHttpClient();
client.get("https://www.google.com", new AsyncHttpResponseHandler() {

    @Override
    public void onStart() {
        // called before request is started
    }

    @Override
    public void onSuccess(int statusCode, Header[] headers, byte[] response) {
        // called when response HTTP status is "200 OK"
    }

    @Override
    public void onFailure(int statusCode, Header[] headers, byte[] errorResponse, Throwable e) {
        // called when response HTTP status is "4XX" (eg. 401, 403, 404)
    }

    @Override
    public void onRetry(int retryNo) {
        // called when request is retried
    }
});

二、静态的客户端

import com.loopj.android.http.*;

public class TwitterRestClient {
  private static final String BASE_URL = "https://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;
  }
}

很容易的去使用Twitter API

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(int statusCode, Header[] headers, JSONObject response) {
                // If the response is JSONObject instead of expected JSONArray
            }

            @Override
            public void onSuccess(int statusCode, Header[] headers, 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);
            }
        });
    }
}

三、持久的Cookie存储：PersistentCookieStore
（1）创建一个AsyncHttpClient实例

AsyncHttpClient myClient = new AsyncHttpClient();

（2）创建一个PersistentCookieStore实例

PersistentCookieStore myCookieStore = new PersistentCookieStore(this);
myClient.setCookieStore(myCookieStore);

（3）任何从服务器收到的Cookie都将永久的保存在Cookie store里。
想要将自己的Cookie存储到Cookie store中，只需要创建一个新的Cookie并调用addCookie。

BasicClientCookie newCookie = new BasicClientCookie("cookiesare", "awesome");
newCookie.setVersion(1);
newCookie.setDomain("mydomain.com");
newCookie.setPath("/");
myCookieStore.addCookie(newCookie);

四、使用RequestParams添加get/post参数。RequestParams可以由不同的方法创建
（1）创建一个新的RequestParams并且立即添加一些参数

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

（2）创建只有一个参数的RequestParams

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

（3）从现有的map中的键值对创建一个RequestParams

HashMap<String, String> paramMap = new HashMap<String, String>();
paramMap.put("key", "value");
RequestParams params = new RequestParams(paramMap);

五、利用RequestParams上传文件
（1）创建一个InputStream通过RequestParams去上传文件

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

（2）.File方式

File myFile = new File("/path/to/file.png");
RequestParams params = new RequestParams();
try {
    params.put("profile_picture", myFile);
} catch(FileNotFoundException e) {}

（3）btye数组方式

byte[] myByteArray = blah;
RequestParams params = new RequestParams();
params.put("soundtrack", new ByteArrayInputStream(myByteArray), "she-wolf.mp3");

六、使用FileAsyncHttpResponseHandler下载二进制数据

AsyncHttpClient client = new AsyncHttpClient();
client.get("https://example.com/file.png", new FileAsyncHttpResponseHandler(/* Context */ this) {
    @Override
    public void onSuccess(int statusCode, Header[] headers, File response) {
        // Do something with the file `response`
    }
});

七、添加基本的认证凭证
（1）一些请求可能需要类似username/password 的凭证。可以使用setBasicAuth来添加自己的凭证

AsyncHttpClient client = new AsyncHttpClient();
client.setBasicAuth("username","password/token");
client.get("https://example.com");

（2）提供更具体的凭证范围

AsyncHttpClient client = new AsyncHttpClient();
client.setBasicAuth("username","password", new AuthScope("example.com", 80, AuthScope.ANY_REALM));
client.get("https://example.com");

我自己对照着官方文档整理的，无意间发现了别人比我整理的更清晰的文档。大家也可以去看看。
http://blog.youkuaiyun.com/qduningning/article/details/34829429