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android-async-http，是一个android异步网络数据请求框架，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。本篇简单介绍一下它的用法，分别实现上传和下载文件的功能。
一.android-async-http简介
-
开源项目android-async-http地址：
https://github.com/loopj/android-async-http -
android-async-http核心组件：
a). AsyncHttpResponseHandler ——这是一个请求返回处理，成功，失败，开始，完成，等自定义的消息的类；
b). BinaryHttpResponseHandler extends AsyncHttpResponseHandler ——继承AsyncHttpResponseHandler的子类，这是一个字节流返回处理的类， 该类用于处理图片等类；
c). JsonHttpResponseHandler extends AsyncHttpResponseHandler ——继承AsyncHttpResponseHandler的子类，这是一个json请求返回处理服务器与客户端用json交流时使用的类；
d). AsyncHttpRequest implements Runnable ——基于线程的子类，用于 异步请求类， 通过AsyncHttpResponseHandler回调。
e). PersistentCookieStore implements CookieStore ——这是一个基于CookieStore的子类， 使用HttpClient处理数据，并且使用cookie持久性存储接口。f). RequestParams ——封装了参数处理 例如：
RequestParams params = new RequestParams();
params.put("uid", "00001");
params.put("password", "111111");
核心操作类：
a). RetryHandler implements HttpRequestRetryHandler——这是一个多个线程同步处理的类；
b). SerializableCookie implements Serializable——这是操作cookie 放入/取出数据的类；
c). SimpleMultipartEntity implements HttpEntity——用于处理多个请求实体封装；
d). SyncHttpClient extends AsyncHttpClient——同步客户端请求的类；
e). AsyncHttpClient——异步客户端请求的类。
二.android-async-http实践
- HttpClientUtil封装类的实现：
这个class对AsyncHttpClient进行了封装。
public class HttpClientUtil {
// 实例话对象
private static AsyncHttpClient client = new AsyncHttpClient();
static {
client.setTimeout(11000); // 设置链接超时，如果不设置，默认为10s
}
public static AsyncHttpClient getClient() {
return client;
}
// 用一个完整url获取一个string对象
public static void get(String urlString, AsyncHttpResponseHandler res) {
client.get(urlString, res);
}
// url里面带参数
public static void get(String urlString, RequestParams params,
AsyncHttpResponseHandler res) {
client.get(urlString, params, res);
}
// 不带参数，获取json对象或者数组
public static void get(String urlString, JsonHttpResponseHandler res) {
client.get(urlString, res);
}
// 带参数，获取json对象或者数组
public static void get(String urlString, RequestParams params,
JsonHttpResponseHandler res) {
client.get(urlString, params, res);
}
// 下载数据使用，会返回byte数据
public static void get(String uString, BinaryHttpResponseHandler bHandler) {
client.get(uString, bHandler);
}
//多个url？
public static void get(String urlString, RequestParams params,
BinaryHttpResponseHandler bHandler) {
client.get(urlString, params, bHandler);
}
//post
public static void post(String urlString, RequestParams params,
ResponseHandlerInterface bHandler) {
client.post(urlString, params, bHandler);
}
2. MyImageDownLoader的实现：
提供了下载图片的函数
public class MyImageDownLoader {
private static final String TAG = "MyImageDownLoader";
Context mContext;
public interface DownLoaderListener {
public void onResult(int res, String s);
}
public MyImageDownLoader() {
}
//download image
public void downloadImage(String uri, String savePath, DownLoaderListener downLoaderListener){
// 指定文件类型
String[] allowedContentTypes = new String[] { "image/png", "image/jpeg" };
HttpClientUtil.get(uri, new ImageResponseHandler(allowedContentTypes,savePath, downLoaderListener));
}
public class ImageResponseHandler extends BinaryHttpResponseHandler{
private String[] allowedContentTypes;
private String savePathString;
DownLoaderListener mDownLoaderListener;
public ImageResponseHandler(String[] allowedContentTypes, String path, DownLoaderListener downLoaderListener){
super();
this.allowedContentTypes = allowedContentTypes;
savePathString = path;
mDownLoaderListener = downLoaderListener;
}
@Override
public void onSuccess(int statusCode, Header[] headers,
byte[] binaryData) {
Log.i(TAG, " statusCode=========" + statusCode);
Log.i(TAG, " statusCode=========" + headers);
Log.i(TAG, " statusCode====binaryData len=====" + binaryData.length);
if (statusCode == 200 && binaryData!=null && binaryData.length > 0) {
boolean b = saveImage(binaryData,savePathString);
if (b) {
mDownLoaderListener.onResult(0, savePathString);
}
else {
//fail
mDownLoaderListener.onResult(-1, savePathString);
}
}
}
@Override
public void onFailure(int statusCode, Header[] headers,
byte[] binaryData, Throwable error) {
Log.i(TAG, "download failed");
}
private boolean saveImage(byte[] binaryData, String savePath) {
Bitmap bmp = BitmapFactory.decodeByteArray(binaryData, 0,
binaryData.length);
Log.i(TAG,"saveImage==========" + savePath);
File file = new File(savePath);
// 压缩格式
CompressFormat format = Bitmap.CompressFormat.JPEG;
// 压缩比例
int quality = 100;
try {
if (file.createNewFile()){
OutputStream stream = new FileOutputStream(file);
// 压缩输出
bmp.compress(format, quality, stream);
stream.close();
return true;
}
} catch (IOException e) {
Log.i(TAG,"saveImage====003======" + savePath);
e.printStackTrace();
}
Log.i(TAG,"saveImage====004======" + savePath);
return false;
}
}
}
3. HttpAsyncUploader的实现：
/**
* 异步上传单个文件
*/
public class HttpAsyncUploader {
private static final String TAG = "HttpAsyncUploader";
Context mContext;
public HttpAsyncUploader() {
}
public void uploadFile(String uri, String path) {
File file = new File(path);
RequestParams params = new RequestParams();
try {
params.put("image", file, "application/octet-stream");
AsyncHttpClient client = new AsyncHttpClient();
HttpClientUtil.post(path, params, new AsyncHttpResponseHandler() {
@Override
public void onSuccess(int statusCode, Header[] headers,
byte[] responseBody) {
Log.i(TAG, " statusCode=========" + statusCode);
Log.i(TAG, " statusCode=========" + headers);
Log.i(TAG, " statusCode====binaryData len====="+ responseBody.length);
}
@Override
public void onFailure(int statusCode, Header[] headers,
byte[] responseBody, Throwable error) {
Log.i(TAG, " statusCode=========" + statusCode);
Log.i(TAG, " statusCode=========" + headers);
Log.i(TAG, " statusCode====binaryData len====="+ responseBody.length);
Log.i(TAG," statusCode====error====="+ error.getLocalizedMessage());
}
});
} catch (FileNotFoundException e) {
}
}
}
4. 调用方法：仅以MyImageDownLoader 来举例说明。
1）MyImageDownLoader 测试函数（在activity中实现）：
private static String URL_PHOTO = "http://img001.us.expono.com/100001/100001-1bc30-2d736f_m.jpg";
private void downloadTest() {
String url =URL_PHOTO；
String fileName = "" + System.currentTimeMillis() + ".jpg";
String savePath = mContext.getCacheDir() + File.separator + fileName;
MyImageDownLoader mMyImageDownLoader = new MyImageDownLoader();
// 开始异步下载
mMyImageDownLoader.downloadImage(
url,
savePath,
new DownLoaderListener() {
@Override
public void onResult(int res, String s) {
Log.i(TAG,"onResult====res===" + res);
Log.i(TAG, "onResult====s===" + s);
if (res == 0) {
// 下载成功
Toast.makeText(mContext, "download success!", Toast.LENGTH_LONG).show();
} else {
// 下载photo失败
Toast.makeText(mContext, "download fail!", Toast.LENGTH_LONG).show();
}
}
});
}
5 项目demo地址：
https://github.com/ranke/HttpAsyncTest/tree/master/code/src/com/util/http