[教学] Unable to resolve host “url”; No address associated with hostname

Java android 错误 BufferedReader InputStreamReader 一直报错 Unable to resolve host “<url>”; No address associated with hostname

谷歌过后还蛮多人说要加这一行：
<uses-permission android:name="android.permission.INTERNET" />

问题是都加了，还是报错。

检查之后，我的Wifi or 3G or 4G 网路没开 =.=
Please check your Wifi or 3G or 4G internet connection and make sure is connected.