1.框架
loopj.com/android-async-http/
2.使用:
AsyncHttpClient client = new AsyncHttpClient(); client.get("http://www.google.com", new AsyncHttpResponseHandler() { @Override public void onSuccess(String response) { System.out.println(response); } });
注意坑:client推荐使用单例,但是不要随便放在class的static里面, 一定要放到application类里面。 否则切出应用2分钟后回来,请求失败了啊。
3.返回处理(以json为例,结合gson直接拿到返回对象)
new AsyncHttpResponseHandler() { public void onSuccess(String response) { UserInfoResp resp = new Gson().fromJson(response, UserInfoResp.class); } else { // 报错 progress.CloseProgress(); Toast.makeText(LoginActicity.this, resp.errMsg, Toast.LENGTH_SHORT).show(); } } @Override public void onFailure(int statusCode, Header[] headers, byte[] responseBody, Throwable error) { onFailurePrint(statusCode, headers, responseBody, error); } }); /** * 请求onFailur时候的错误打印模版 */ public static void onFailurePrint(int statusCode,Header[] headers, byte[] responseBody, Throwable error){ if(error!=null){ Log.e("ossclient", "statusCode="+statusCode,error); }else{ Log.e("ossclient", "statusCode="+statusCode+" without Exception"); } if (responseBody!=null) { try { Log.e("ossclient", new String(responseBody, "UTF-8")); } catch (UnsupportedEncodingException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }
4. 批量图片上传; 如果需要等待全部结果的返回,可以使用 CountDownLatch
http://developer.android.com/reference/java/util/concurrent/CountDownLatch.html
原以为安卓里面没有这种java特性,于是自己写了老半天,主要是两个坑:
1.、 计数对象必须加volatile private volatile int count_OK = 0;
2、 需单独开线程来循环计数,如果主线程做循环计数,while会导致无法处理response。
//等待全部上传ok再提交后台 new Thread(){public void run(){ while(count_OK < size_ALL){ try { sleep(200); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } } System.out.println("haha"); addPics(); }}.start();