關于在模擬機運行沒問題，在真機運行就Exception

 E/AndroidRuntime: FATAL EXCEPTION: main

    Process: com.example.inchat, PID: 2857

    android.os.NetworkOnMainThreadException

        at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1303)

        at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:111)

        at java.net.SocketOutputStream.write(SocketOutputStream.java:157)

        at java.io.PrintStream.write(PrintStream.java:492)

        at sun.nio.cs.StreamEncoder.writeBytes(StreamEncoder.java:221)

        at sun.nio.cs.StreamEncoder.implFlushBuffer(StreamEncoder.java:291)

        at sun.nio.cs.StreamEncoder.flushBuffer(StreamEncoder.java:104)

        at java.io.OutputStreamWriter.flushBuffer(OutputStreamWriter.java:185)

        at java.io.PrintStream.write(PrintStream.java:543)

        at java.io.PrintStream.print(PrintStream.java:687)

        at java.io.PrintStream.println(PrintStream.java:824)

        at com.example.inchat.MainActivity$MsgThread$1.onClick(MainActivity.java:120)

        at android.view.View.performClick(View.java:5647)

        at android.view.View$PerformClick.run(View.java:22461)

        at android.os.Handler.handleCallback(Handler.java:754)

        at android.os.Handler.dispatchMessage(Handler.java:95)

        at android.os.Looper.loop(Looper.java:163)

        at android.app.ActivityThread.main(ActivityThread.java:6374)

        at java.lang.reflect.Method.invoke(Native Method)

        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:931)

        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:821)

java.net.SocketException: Connection reset

        at java.net.SocketInputStream.read(SocketInputStream.java:210)

        at java.net.SocketInputStream.read(SocketInputStream.java:141)

        at sun.nio.cs.StreamDecoder.readBytes(StreamDecoder.java:284)

        at sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:326)

        at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:178)

        at java.io.InputStreamReader.read(InputStreamReader.java:184)

        at java.io.BufferedReader.fill(BufferedReader.java:161)

        at java.io.BufferedReader.readLine(BufferedReader.java:324)

        at java.io.BufferedReader.readLine(BufferedReader.java:389)

        at Server$Service.run(Server.java:72)

        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)

        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)

        at java.lang.Thread.run(Thread.java:748)

package com.example.inchat;



import android.app.AlertDialog;

import android.content.DialogInterface;

import android.content.Intent;

import android.os.Looper;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

import android.widget.TextView;

import android.widget.ThemedSpinnerAdapter;

import android.widget.Toast;



import java.io.BufferedReader;

import java.io.BufferedWriter;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.OutputStreamWriter;

import java.io.PrintStream;

import java.io.PrintWriter;

import java.net.Socket;



public class MainActivity extends AppCompatActivity {

    private String host = "192.168.0.107";

    private Button button;

    private EditText editText;

    private TextView textView;

    private StringBuilder sb = null;

    private BufferedReader br;

    private PrintStream ps;

    private PrintWriter pw;

    private Intent intent;

    public static final int port = 12345;

    int count = 0;

    Socket client;

    String s;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        button = (Button) findViewById(R.id.button_send);

        editText = (EditText) findViewById(R.id.editText);

        textView = (TextView) findViewById(R.id.textView);



       showInputDialog();



    }



//#99CCFF



    private class DialogThread implements Runnable{

        public DialogThread() {

            new Thread(this).start();

        }

        @Override

        public void run() {

            showInputDialog();

        }

    }





    public void showInputDialog() {

        final Intent intent = new Intent();

        final EditText editText1 = new EditText(MainActivity.this);

        AlertDialog.Builder inputDialog = new AlertDialog.Builder(MainActivity.this);

        inputDialog.setTitle("起一個好聽點的名字");

        inputDialog.setView(editText1);

        final String[] t = new String[1];

        inputDialog.setPositiveButton("確定", new DialogInterface.OnClickListener() {



            @Override

            public void onClick(DialogInterface dialog, int which) {

                String temp = editText1.getText().toString();

                new StartThread(temp);

                t[0] = temp;

            }

        });

        inputDialog.show();

//        return t[0];

    }









    private class StartThread implements Runnable {

        String s;

        public StartThread(String s) {

            new Thread(this).start();

            this.s = s;

        }

        @Override

        public void run() {

            try {

                client = new Socket(host, port);

                br = new BufferedReader(new InputStreamReader(client.getInputStream()));

                ps = new PrintStream(client.getOutputStream());

                ps.println(s);



            } catch (IOException e) {

                e.printStackTrace();

            }

            new MsgThread();

        }



    }



    private class MsgThread implements Runnable{

        public MsgThread() {

            new Thread(this).start();

        }

        @Override

        public void run() {

            button.setOnClickListener(new View.OnClickListener() {

                @Override

                public void onClick(View v) {

                    String str = editText.getText().toString();

                    textView.setText(str);

                    ps.println(str);



                }

            });

        }

    }

}

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