小编thi*_*did的帖子

我正在尝试检查是否可以使用以下简单方法建立与TCP服务器的连接：

public static boolean serverListening()
{
    Socket s = null;
    try
    {
        s = new Socket("192.168.42.213", 80);
        return true;
    }
    catch (Exception e)
    {
        Log.d("SocketException", "Exception",e);
        return false;
    }
    finally
    {
        if(s != null)
            try {s.close();}
            catch(Exception e){}
    }
}

我的服务器已经可以正常工作，因为我可以在模拟器内部使用chrome连接到服务器，因此问题必须出在我的代码中。如果我尝试运行代码，则会收到以下异常：

SocketException
android.os.NetworkOnMainThreadException
    at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1513)
    at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:389)
    at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:230)
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:212)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:436)
    at java.net.Socket.connect(Socket.java:621)
    at java.net.Socket.connect(Socket.java:570)
    at java.net.Socket.<init>(Socket.java:450)
    at java.net.Socket.<init>(Socket.java:218)
    at com.example.batterymonitor.MainActivity.serverListening(MainActivity.java:104)
    at com.example.batterymonitor.MainActivity.onCreate(MainActivity.java:58)
    at android.app.Activity.performCreate(Activity.java:7136)
    at android.app.Activity.performCreate(Activity.java:7127)
    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1271)
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2893)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3048)
    at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:78)
    at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
    at …