android开发之简单http请求 2017-03-05 阅读次数：

直接代码了

通过

private void sendRequestWithHttpURLConnection()
    {
        //开启线程发起网络请求
        new Thread(new Runnable() {
            @Override
            public void run() {
                HttpURLConnection connection = null;
                BufferedReader reader = null;
                try {
                    URL url = new URL("http://ring3.xyz");
                    connection = (HttpURLConnection) url.openConnection();
                    connection.setRequestMethod("GET");
                    connection.setConnectTimeout(5000);
                    connection.setReadTimeout(5000);
                    InputStream in = connection.getInputStream();

                    //读取输入流
                    reader = new BufferedReader(new InputStreamReader(in));
                    StringBuilder response = new StringBuilder();
                    String line;
                    while((line = reader.readLine()) != null)
                    {
                        response.append(line);
                    }
                    showResponse(response.toString());
                }
                catch (Exception e) {
                    e.printStackTrace();
                }
                finally {
                    if (reader != null) {
                        try{
                            reader.close();
                        }
                        catch (IOException e) {
                            e.printStackTrace();
                        }
                    }
                    if (connection != null) {
                        connection.disconnect();
                    }
                }
            }
        }).start();
    }

同时记录下安卓下异步事件分发，如下场景
在子线程中进行UI的操作，比如更新某个文本，由于android的UI交互是线程不安全的，所以界面操作只能在主线程中进行，那么，就要想办法让子线程通知主线程了，可以通过Handler实现
在子线程中构造一个Message，然后通过Handler对象进行通知

new Thread(new Runnable())
{
    @Override
    public void run()
    {
        ...
        Message msg = new Message(); 
        msg.what = x;
        handler.sendMessage(msg);   //通知      
        ...
    }
}
主线程
private Handler handler = new Handler()
{
    public void handleMessage(Message msg)
    {
        xxx    
    }
}

android中异步消息处理主要由四部分构成
Message 需要传递的信息
Handler 最终处理者
Looper 每个线程一个，负责取消息与分发
MessageQueue 每个线程一个，存放消息队列