Android HTTP连接

Question

任何人都可以告诉我为什么这在Android模拟器中不起作用？从浏览器我有访问权限,服务器是内部的.我能想到的是,我在我的应用程序上缺少一些配置,因此它可以访问网络层.

try {
    InetAddress server = Inet4Address.getByName("thehost");
    //Doesn't work either
    //or InetAddress server2 = Inet4Address.getByAddress(new String("192.168.1.30").getBytes());

    if(server.isReachable(5000)){
        Log.d(TAG, "Ping!");
    }

    Socket clientsocket = new Socket(server, 8080);
} catch (UnknownHostException e) {
    Log.e(TAG, "Server Not Found");
} catch (IOException e) {
    Log.e(TAG, "Couldn't open socket");
}

抛出UnknownHostException

谢谢

Answer 1

就配置而言,从应用程序访问Internet所需的唯一设置是INTERNET权限,通过在应用程序清单中的Application标记之外添加以下行来启用.

<uses-permission android:name="android.permission.INTERNET" />

因此清单将遵循这种一般结构

<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.android.apis">    
  <uses-permission android:name="android.permission.INTERNET" />
  <application 
    android:name="MyApplication"    
    android:label="@string/application_title"
    android:icon="@drawable/my_icon">
    [ .. Your Activities go here ]
  </application>
</manifest>