实现http异步请求get,post请求，也可以用作文件上传。 下面是登录的示例

    AsyncHttpClient client = new AsyncHttpClient();  
      
                        RequestParams params = new RequestParams();  
      
                        params.add("RequestType", "");  
                        params.add("UserID", "-1");  
                        params.add("NurseID", "-1");  
                        params.add("HospitalId", "-1");  
      
                        JSONObject jsonObject = new JSONObject();  
                        try {  
                            jsonObject.put("UserCode", username);  
                            jsonObject.put("Password", password);  
                        } catch (JSONException e) {  
                            // TODO Auto-generated catch block  
                            e.printStackTrace();  
                        }  
      
                        params.add("RequestParam", jsonObject.toString());  
      
                        client.get(path, params, new TextHttpResponseHandler() {  
      
                            @Override  
                            public void onSuccess(int statusCode, Header[] headers,  
                                    String responseString) {  
                                // TODO Auto-generated method stub  
                                if (statusCode == 200) {  
      
                                    // Toast.makeText(getApplicationContext(),  
                                    // responseString, Toast.LENGTH_SHORT)  
                                    // .show();  
                                                Intent intent = new Intent();  
                                                intent.setClass(  
                                                        getApplicationContext(),  
                                                        MainActivity.class);  
                                                startActivity(intent);  
                                            } else {  
                                                Intent intent = new Intent();  
                                                intent.setClass(  
                                                        getApplicationContext(),  
                                                        MainActivity.class);  
                                                startActivity(intent);  
                                            }  
      
                                        } else {  
                                            Toast.makeText(getApplicationContext(),  
                                                    msg, Toast.LENGTH_SHORT).show();  
                                        }  
                                    } catch (JSONException e) {  
                                        // TODO Auto-generated catch block  
                                        e.printStackTrace();  
                                    }  
                                }else {  
                                    Toast.makeText(getApplicationContext(),  
                                            "网络连接超时", Toast.LENGTH_SHORT).show();  
                                }  
                            }  
      
                            @Override  
                            public void onFailure(int statusCode, Header[] headers,  
                                    String responseString, Throwable throwable) {  
                                // TODO Auto-generated method stub  
                                Toast.makeText(getApplicationContext(),  
                                        responseString, Toast.LENGTH_SHORT).show();  
                            }  

1.声明一个client对象，初始化

2.根据需要调用client中get,post请求

3，重写onSuccess（）和onFailure（）方法

注：在https://github.com/AsyncHttpClient/async-http-client下载包，直接将library下的包直接粘贴到项目src下，直接调用即可