android 获取URL资源的输入流怎么不行??

Question

//url.openStream()为什么报错??
//分两步就可以
 HttpURLConnection conn = (HttpURLConnection) url.openConnection();
    InputStream is =conn.getInputStream();

Answer 1

如果你报的异常是android.os.NetworkOnMainThreadException，那么就是因为在Android4.0之后不允许在主线程进行网络连接等耗时操作