Android学习——android-async-http

android-async-http

android-async-http介绍

android-async-http是基于Apache HttpClient库之上的一个异步网络请求处理库，网络处理均基于Android的非UI线程，通过回调方法处理请求结果，目前非常火的应用Instagram就是用的这个网络请求库。
其主要特征如下:处理异步Http请求，并通过匿名内部类处理回调结果，Http异步请求均位于非UI线程，不会阻塞UI操作，通过线程池处理并发请求处理文件上传、下载，响应结果自动打包JSON格式自动处理连接断开时请求重连。
官方下载：http://looopj.com/android-async-http/

发送一个异步请求

发送一个简单的GET请求

public void sendSimpleGetClick(View view){
    AsyncHttpClient client=new AsyncHttpClient();
    client.get("http://www.baidu.com", new AsyncHttpResponseHandler() {//处理普通文本内容
        @Override
        public void onSuccess(int statusCode, Header[] headers, byte[] responseBody) {
            //200 ok
            String info=new String(responseBody);
            System.out.println(info);
        }

        @Override
        public void onFailure(int statusCode, Header[] headers, byte[] responseBody, Throwable error) {
            System.out.println("error:"+new String(responseBody));
        }
    });
}

若要使用post请求，只需将get改成post即可

请求参数设置

创建RequestParams添加请求参数：

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

添加一个参数可使用：

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

使用Map添加参数：

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

具体代码如下

public void sendSimpleParamsClick(View view){
        AsyncHttpClient client=new AsyncHttpClient();
        RequestParams params=new RequestParams();
        params.put("cityname","朝阳");
        client.post(this, "http://apis.baidu.com/apistore/weatherservice/citylist", params, new AsyncHttpResponseHandler() {
            @Override
            public void onSuccess(int statusCode, Header[] headers, byte[] responseBody) {
                System.out.println(new String(responseBody));
            }

            @Override
            public void onFailure(int statusCode, Header[] headers, byte[] responseBody, Throwable error) {
                System.out.println(new String(responseBody));
            }
        });
    }

上传文件
添加一个文件流

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

添加一个文件对象

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

添加一个字节数组

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

具体代码

public void upLoadClick(View view){
    AsyncHttpClient client=new AsyncHttpClient();
    RequestParams params=new RequestParams();
    params.put("description","风景图片");
    //设置文件
    try {
        //获得文件路径
        String path= Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS)+"/timg.jpg";
        params.put("timg.jpg",new File(path),"image/jpeg");
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    }
    client.post(this, url, params, new AsyncHttpResponseHandler() {
        @Override
        public void onSuccess(int statusCode, Header[] headers, byte[] responseBody) {
            System.out.println(new String(responseBody));
        }

        @Override
        public void onFailure(int statusCode, Header[] headers, byte[] responseBody, Throwable error) {
            System.out.println(new String(responseBody));
        }
    });
}

FileAsyncHttpResponseHandler

下载文件

public void downLoadClick(View view){
    AsyncHttpClient client=new AsyncHttpClient();
    client.get("http://b.hiphotos.baidu.com/image/pic/item/4b90f603738da977f86d8b56be51f8198618e309.jpg", new FileAsyncHttpResponseHandler(this) {
        @Override
        public void onFailure(int statusCode, Header[] headers, Throwable throwable, File file) {
            //error
        }

        @Override
        public void onSuccess(int statusCode, Header[] headers, File file) {
            //success
            System.out.println(file.getAbsolutePath());
            String path=Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES)+"/4b90f603738da977f86d8b56be51f8198618e309.jpg";
            try {
                InputStream inputStream=new FileInputStream(file);
                OutputStream outputStream=new FileOutputStream(path);
                byte[] bytes=new byte[100];
                int len=-1;
                while((len=inputStream.read(bytes))!=-1){
                    outputStream.write(bytes,0,len);
                    outputStream.flush();
                }
                outputStream.close();
                inputStream.close();
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
            System.out.println("DownLoad Complete");
        }
    });
}

JsonHttpResponseHandler

带Json参数的POST

public void jsonClick(View view){
    AsyncHttpClient client=new AsyncHttpClient();
    String url="http://api.com/login";
    JSONObject jsonObject=new JSONObject();
    try {
        jsonObject.put("username", "ryantang");
        StringEntity entity=new StringEntity(jsonObject.toString());
        client.post(this,url,entity,"application/json",new JsonHttpResponseHandler(){
            @Override
            public void onSuccess(int statusCode, Header[] headers, JSONObject response) {
                super.onSuccess(statusCode, headers, response);
                System.out.println(response.toString());
            }
        });
    } catch (JSONException e) {
        e.printStackTrace();
    } catch (UnsupportedEncodingException e) {
        e.printStackTrace();
    }
}