android笔记20170116

满堂花醉三千客，一剑霜寒十四州。这篇文章主要讲述android笔记20170116相关的知识，希望能为你提供帮助。
封装http请求类，利用回调机制获取返回值

public interface HttpCallbackListener {void onFinish(String response); void onError(Exception e); }

public class HttpUtil { public static void sendHttpRequest(final String address, final HttpCallbackListener listener){ new Thread(new Runnable(){@Override public void run() { HttpURLConnection connection = null; try { URL url = new URL(address); connection = (HttpURLConnection) url.openConnection(); connection.setRequestMethod("GET"); connection.setConnectTimeout(8000); connection.setReadTimeout(8000); connection.setDoInput(true); connection.setDoOutput(true); InputStream in = connection.getInputStream(); BufferedReader reader = new BufferedReader(new InputStreamReader(in)); StringBuilder response = new StringBuilder(); String line; while((line = reader.readLine()) != null){ response.append(line); } if(listener != null){ listener.onFinish(response.toString()); } } catch (Exception e) { if(listener != null){ listener.onError(e); } } finally{ if(connection != null){ connection.disconnect(); } } }}).start(); } }

使用方法：

HttpUtil.sendHttpRequest("address", new HttpCallbackListener() {@Override public void onFinish(String response) {}@Override public void onError(Exception e) {} });

【android笔记20170116】需要注意的是，最终的回调接口还是在子线程中运行的，因此我们不可以在这里执行任何的UI操作，除非借助runOnUiThread()方法来进行线程转换