Android Socket通讯错误

Question

我正在编写一个小型应用，其中android设备尝试将数据包发送到服务器（这是我自己的计算机）。

我收到一些错误，我不知道如何解决。

这是错误：

>07-02 14:58:56.125: E/AndroidRuntime(17976): FATAL EXCEPTION: main
>07-02 14:58:56.125: E/AndroidRuntime(17976): android.os.NetworkOnMainThreadException
>07-02 14:58:56.125: E/AndroidRuntime(17976):   at >android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1099)
>07-02 14:58:56.125: E/AndroidRuntime(17976):   at >libcore.io.BlockGuardOs.connect(BlockGuardOs.java:84)
>07-02 14:58:56.125: E/AndroidRuntime(17976):   at >libcore.io.IoBridge.connectErrno(IoBridge.java:127)
>07-02 14:58:56.125: E/AndroidRuntime(17976):   at >libcore.io.IoBridge.connect(IoBridge.java:112)
>07-02 14:58:56.125: E/AndroidRuntime(17976):   at >java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)
>07-02 14:58:56.125: E/AndroidRuntime(17976):   at >java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
>07-02 14:58:56.125: E/AndroidRuntime(17976):   at >java.net.Socket.startupSocket(Socket.java:566)
>07-02 14:58:56.125: E/AndroidRuntime(17976):   at >java.net.Socket.tryAllAddresses(Socket.java:127)
>07-02 14:58:56.125: E/AndroidRuntime(17976):   at java.net.Socket.<init>(Socket.java:177)
>07-02 14:58:56.125: E/AndroidRuntime(17976):   at java.net.Socket.<init>(Socket.java:149)
>07-02 14:58:56.125: E/AndroidRuntime(17976):   at >com.amazon.hsyal.WifiSimulatorActivity$1.onClick(WifiSimulatorActivity.java:33)
>07-02 14:58:56.125: E/AndroidRuntime(17976):   at >android.view.View.performClick(View.java:3536)
>07-02 14:58:56.125: E/AndroidRuntime(17976):   at >android.view.View$PerformClick.run(View.java:14130)
>07-02 14:58:56.125: E/AndroidRuntime(17976):   at >android.os.Handler.handleCallback(Handler.java:605)
>07-02 14:58:56.125: E/AndroidRuntime(17976):   at >android.os.Handler.dispatchMessage(Handler.java:92)
>07-02 14:58:56.125: E/AndroidRuntime(17976):   at android.os.Looper.loop(Looper.java:137)
>07-02 14:58:56.125: E/AndroidRuntime(17976):   at >android.app.ActivityThread.main(ActivityThread.java:4495)
>07-02 14:58:56.125: E/AndroidRuntime(17976):   at >java.lang.reflect.Method.invokeNative(Native Method)
>07-02 14:58:56.125: E/AndroidRuntime(17976):   at >java.lang.reflect.Method.invoke(Method.java:511)
>07-02 14:58:56.125: E/AndroidRuntime(17976):   at >com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
>07-02 14:58:56.125: E/AndroidRuntime(17976):   at >com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
>07-02 14:58:56.125: E/AndroidRuntime(17976):   at dalvik.system.NativeStart.main(Native >Method)

我的Android程序是：

    public class WifiSimulatorActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);


        Button send_packet_button = (Button) findViewById(R.id.send_packet_button);
        send_packet_button.setOnClickListener(sendPacketListener);

    }
    Button.OnClickListener sendPacketListener = new Button.OnClickListener(){

        public void onClick(View v) {
            // TODO Auto-generated method stub
            try{
                Socket s = new Socket("192.168.52.138", 12345);
                OutputStream out = s.getOutputStream();
                PrintWriter output = new PrintWriter(out);
                BufferedReader input = new BufferedReader(new InputStreamReader(s.getInputStream()));
                output.write("Sending packet 1");

                s.close();
            }
            catch(UnknownHostException e){
                e.printStackTrace();
            }
            catch(IOException e){
                e.printStackTrace();
            }
        }

    };
}

    public static void main(String[] args){
    try{
    Boolean end = false;
    ServerSocket ss = new ServerSocket(12345);
    System.out.println("Program running");
    while(!end){
            //Server is waiting for client here, if needed
            Socket s = ss.accept();
            BufferedReader input = new BufferedReader(new InputStreamReader(s.getInputStream()));
            PrintWriter output = new PrintWriter(s.getOutputStream(),true); //Autoflush
            String st = input.readLine();
           System.out.println("Tcp Example From client: "+st);
            output.println("Good bye and thanks for all the fish :)");
            s.close();

    }
ss.close();
}

Answer 1

android.os.NetworkOnMainThreadException

当应用程序尝试在其主线程上执行联网操作时引发的异常。

仅针对面向Honeycomb SDK或更高版本的应用程序抛出此错误。 允许以较早版本的SDK为目标的应用程序在其主事件循环线程上进行联网，但不建议这样做。

在您的情况下，您是从MainUI线程运行网络操作的，这就是为什么您遇到此异常的原因（在android中是不允许的）。 使用Android AsyncTask并将您的网络（套接字代码） doInBackGround() AsyncTask的doInBackGround()中。

看这样的问题android.os.NetworkOnMainThreadException

Answer 2

正如文档所说：android.os。 NetworkOnMainThreadException ：

当应用程序尝试在其主线程上执行联网操作时引发的异常。

因此，请尝试使用AsyncTask ， Handler ， HandlerThread和runOnUiThread来实现您的网络相关代码