Android套接字创建失败

Question

我有这种方法来启动套接字连接，以便可以在PC和电话之间聊天。 我的PC上已经有一个服务器正在等待来自Android的连接。

private void connectToServer() throws IOException
    {
        showMessage("Starting Connection...");
        connection = new Socket(InetAddress.getByName(serverIP), 0511);
        showMessage("\n Connection Established: "+connection.getInetAddress().getHostName());
    }

这是我运行它时遇到的错误：

03-08 19:02:36.847: E/AndroidRuntime(2524): FATAL EXCEPTION: main
03-08 19:02:36.847: E/AndroidRuntime(2524): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.jister13.chattest/com.jister13.chattest.ChatRoom}: android.os.NetworkOnMainThreadException
03-08 19:02:36.847: E/AndroidRuntime(2524):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2088)
03-08 19:02:36.847: E/AndroidRuntime(2524):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2113)
03-08 19:02:36.847: E/AndroidRuntime(2524):     at android.app.ActivityThread.access$700(ActivityThread.java:139)
03-08 19:02:36.847: E/AndroidRuntime(2524):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1224)
03-08 19:02:36.847: E/AndroidRuntime(2524):     at android.os.Handler.dispatchMessage(Handler.java:99)
03-08 19:02:36.847: E/AndroidRuntime(2524):     at android.os.Looper.loop(Looper.java:137)
03-08 19:02:36.847: E/AndroidRuntime(2524):     at android.app.ActivityThread.main(ActivityThread.java:4918)
03-08 19:02:36.847: E/AndroidRuntime(2524):     at java.lang.reflect.Method.invokeNative(Native Method)
03-08 19:02:36.847: E/AndroidRuntime(2524):     at java.lang.reflect.Method.invoke(Method.java:511)
03-08 19:02:36.847: E/AndroidRuntime(2524):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1004)
03-08 19:02:36.847: E/AndroidRuntime(2524):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:771)
03-08 19:02:36.847: E/AndroidRuntime(2524):     at dalvik.system.NativeStart.main(Native Method)
03-08 19:02:36.847: E/AndroidRuntime(2524): Caused by: android.os.NetworkOnMainThreadException
03-08 19:02:36.847: E/AndroidRuntime(2524):     at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1118)
03-08 19:02:36.847: E/AndroidRuntime(2524):     at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:84)
03-08 19:02:36.847: E/AndroidRuntime(2524):     at libcore.io.IoBridge.connectErrno(IoBridge.java:127)
03-08 19:02:36.847: E/AndroidRuntime(2524):     at libcore.io.IoBridge.connect(IoBridge.java:112)
03-08 19:02:36.847: E/AndroidRuntime(2524):     at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)
03-08 19:02:36.847: E/AndroidRuntime(2524):     at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
03-08 19:02:36.847: E/AndroidRuntime(2524):     at java.net.Socket.startupSocket(Socket.java:565)
03-08 19:02:36.847: E/AndroidRuntime(2524):     at java.net.Socket.<init>(Socket.java:225)
03-08 19:02:36.847: E/AndroidRuntime(2524):     at com.jister13.chattest.ChatRoom.connectToServer(ChatRoom.java:88)
03-08 19:02:36.847: E/AndroidRuntime(2524):     at com.jister13.chattest.ChatRoom.startRunning(ChatRoom.java:74)
03-08 19:02:36.847: E/AndroidRuntime(2524):     at com.jister13.chattest.ChatRoom.onCreate(ChatRoom.java:69)
03-08 19:02:36.847: E/AndroidRuntime(2524):     at android.app.Activity.performCreate(Activity.java:5048)
03-08 19:02:36.847: E/AndroidRuntime(2524):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1094)
03-08 19:02:36.847: E/AndroidRuntime(2524):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2052)
03-08 19:02:36.847: E/AndroidRuntime(2524):     ... 11 more

有人知道这个问题可能是什么吗？

Answer 1

阅读所引发的异常中包含的错误！

Caused by: android.os.NetworkOnMainThreadException

由于您尝试在主UI线程上进行联网操作，因此引发了异常。 在Android中，您必须在UI线程外执行所有耗时的任务（联网，数据库访问，冗长的数字处理等）。

您需要在单独的非UI线程上执行此操作。