要用到的jar包： 
android-async-http-1.4.8.jar

AysnHttpUtils：

package com.xxx.xxx.xxx; import org.apache.http.protocol.HTTP; import com.loopj.android.http.AsyncHttpClient; import com.loopj.android.http.AsyncHttpResponseHandler; import com.loopj.android.http.BinaryHttpResponseHandler; import com.loopj.android.http.JsonHttpResponseHandler; import com.loopj.android.http.RequestParams; import com.loopj.android.http.TextHttpResponseHandler; /**
 * Created by sj on 2016/3/4.
 */ public class AysnHttpUtils { private static AsyncHttpClient client = new AsyncHttpClient(); // 实例话对象 static {
        client.setTimeout(11000); // 设置链接超时，如果不设置，默认为10s } /**
     * 用一个完整url获取一个string对象
     * 
     * @param urlString
     * @param res
     */ public static void get_String(String urlString, TextHttpResponseHandler res) {

        client.get(urlString, res);
    } /**
     * 获取json对象或者数组
     * 
     * @param urlString
     * @param res
     */ public static void get_Json(String urlString, JsonHttpResponseHandler res) {
        client.get(urlString, res);
    } /**
     * 下载数据使用，会返回byte数据
     * 
     * @param uString
     * @param bHandler
     */ public static void get_Byte(String uString,
            BinaryHttpResponseHandler bHandler) {
        client.get(uString, bHandler);
    } /*
     * //创建工厂对象 BitmapFactory bitmapFactory = new BitmapFactory();
     * //工厂对象的decodeByteArray把字节转换成Bitmap对象 Bitmap bitmap =
     * bitmapFactory.decodeByteArray(binaryData, 0, binaryData.length);
     */ /**
     * url里面带参数
     * 
     * @param urlString
     * @param params
     * @param res
     */ public static void post_String(String urlString, RequestParams params,
            TextHttpResponseHandler res) {
        params.setContentEncoding(HTTP.UTF_8);
        client.post(urlString, params, res);
    } /**
     * 带参数，获取json对象或者数组
     * 
     * @param urlString
     * @param params
     * @param res
     */ public static void post_Json(String urlString, RequestParams params,
            JsonHttpResponseHandler res) {
        params.setContentEncoding(HTTP.UTF_8);
        client.post(urlString, params, res);
    } /**
     * 下载数据使用，会返回byte数据
     * 
     * @param uString
     * @param bHandler
     */ public static void post_Byte(String uString, RequestParams params,
            BinaryHttpResponseHandler bHandler) {
        params.setContentEncoding(HTTP.UTF_8);
        client.post(uString, params, bHandler);
    } public static AsyncHttpClient getClient() { return client;
    }
} 

用：

AysnHttpUtils.get_String(这里放你的访问网址url, new TextHttpResponseHandler() { @Override public void onFailure(int i, Header[] headers, String s, Throwable throwable) {
                Toast.makeText(getApplicationContext(),"网络错误",Toast.LENGTH_SHORT).show();
            } @Override public void onSuccess(int i, Header[] headers, String s) {
              Toast.makeText(getApplicationContext(),s,Toast.LENGTH_SHORT).show();
            }
        });