Android致命错误：创建套接字时单击按钮时出现错误java.lang.IllegalStateException

我正试图连接到一个服务器，我正在通过手机运行我的计算机。每次单击connect按钮，它都会显示java.lang.IllegalStateException。单击“连接”按钮时，它会创建一个套接字，用于连接到我计算机上的服务器。 这是错误

08-21 23:45:26.427: E/AndroidRuntime(4986): FATAL EXCEPTION: main
08-21 23:45:26.427: E/AndroidRuntime(4986): java.lang.IllegalStateException: Could not execute method of the activity
08-21 23:45:26.427: E/AndroidRuntime(4986):     at android.view.View$1.onClick(View.java:3044)
08-21 23:45:26.427: E/AndroidRuntime(4986):     at android.view.View.performClick(View.java:3511)
08-21 23:45:26.427: E/AndroidRuntime(4986):     at android.view.View$PerformClick.run(View.java:14105)
08-21 23:45:26.427: E/AndroidRuntime(4986):     at android.os.Handler.handleCallback(Handler.java:605)
08-21 23:45:26.427: E/AndroidRuntime(4986):     at android.os.Handler.dispatchMessage(Handler.java:92)
08-21 23:45:26.427: E/AndroidRuntime(4986):     at android.os.Looper.loop(Looper.java:137)
08-21 23:45:26.427: E/AndroidRuntime(4986):     at android.app.ActivityThread.main(ActivityThread.java:4424)
08-21 23:45:26.427: E/AndroidRuntime(4986):     at java.lang.reflect.Method.invokeNative(Native Method)
08-21 23:45:26.427: E/AndroidRuntime(4986):     at java.lang.reflect.Method.invoke(Method.java:511)
08-21 23:45:26.427: E/AndroidRuntime(4986):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:787)
08-21 23:45:26.427: E/AndroidRuntime(4986):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:554)
08-21 23:45:26.427: E/AndroidRuntime(4986):     at dalvik.system.NativeStart.main(Native Method)
08-21 23:45:26.427: E/AndroidRuntime(4986): Caused by: java.lang.reflect.InvocationTargetException
08-21 23:45:26.427: E/AndroidRuntime(4986):     at java.lang.reflect.Method.invokeNative(Native Method)
08-21 23:45:26.427: E/AndroidRuntime(4986):     at java.lang.reflect.Method.invoke(Method.java:511)
08-21 23:45:26.427: E/AndroidRuntime(4986):     at android.view.View$1.onClick(View.java:3039)
08-21 23:45:26.427: E/AndroidRuntime(4986):     ... 11 more
08-21 23:45:26.427: E/AndroidRuntime(4986): Caused by: android.os.NetworkOnMainThreadException
08-21 23:45:26.427: E/AndroidRuntime(4986):     at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1099)
08-21 23:45:26.427: E/AndroidRuntime(4986):     at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:84)
08-21 23:45:26.427: E/AndroidRuntime(4986):     at libcore.io.IoBridge.connectErrno(IoBridge.java:127)
08-21 23:45:26.427: E/AndroidRuntime(4986):     at libcore.io.IoBridge.connect(IoBridge.java:112)
08-21 23:45:26.427: E/AndroidRuntime(4986):     at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)
08-21 23:45:26.427: E/AndroidRuntime(4986):     at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
08-21 23:45:26.427: E/AndroidRuntime(4986):     at java.net.Socket.startupSocket(Socket.java:566)
08-21 23:45:26.427: E/AndroidRuntime(4986):     at java.net.Socket.<init>(Socket.java:225)
08-21 23:45:26.427: E/AndroidRuntime(4986):     at com.example.socketconnection.Singleton.connect(Singleton.java:44)
08-21 23:45:26.427: E/AndroidRuntime(4986):     at com.example.socketconnection.MainActivity.connect(MainActivity.java:47)
08-21 23:45:26.427: E/AndroidRuntime(4986):     ... 14 more

Singleton.java的代码

package com.example.socketconnection;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.InetAddress;
import java.net.Socket;

public class Singleton 
{
    private Socket socket;
    private DataInputStream input;
    private DataOutputStream output;
    private boolean logged;
    private static Singleton instance;
    private String information;
    private String userName;
    private String password;

    private Singleton()
    {
    }

    public static Singleton getInstance()
    {
            return instance;
    }

    public static void initSingleton()
    {
        if(instance == null)
        {
            instance = new Singleton();
        }
    }

    public String connect(String userName, String password)
    {
        this.userName = userName;
        this.password = password;

        try
        {
            this.socket = new Socket(InetAddress.getByName("192.168.1.79"), 9000);
            this.input = new DataInputStream(socket.getInputStream());
            this.output = new DataOutputStream(socket.getOutputStream());
            output.writeUTF("login");
            output.flush();
            output.writeUTF(userName);
            output.flush();
            output.writeUTF(password);
            output.flush();
            this.information = input.readUTF();
        }
        catch(IOException ex)
        {
            this.information = "Cannot connect to Server";
        }

        return information;
    }

    public void setLogged(boolean logged)
    {
        this.logged = logged;
    }

    public Socket getSocket()
    {
        return socket;
    }

    public DataInputStream getInput()
    {
        return input;
    }

    public DataOutputStream getOutput()
    {
        return output;
    }

    public boolean getLogged()
    {
        return logged;
    }
}

UserList.java的代码

package com.example.socketconnection;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.Socket;
import java.util.List;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class UserList extends Activity 
{

    private Socket socket;
    private DataInputStream input;
    private DataOutputStream output;
    private String userName;
    private String [] users;

    @Override
    public void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_user_list);

        Intent intent = getIntent();
        userName = intent.getStringExtra(MainActivity.EXTRA_MESSAGE);



        ListView userList = (ListView)findViewById(R.id.userList);
        users = new String[0];
        ArrayAdapter<String> listAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, android.R.id.text1, users);
        userList.setAdapter(listAdapter);
        socket = Singleton.getInstance().getSocket();
        input = Singleton.getInstance().getInput();
        output = Singleton.getInstance().getOutput();
        Runnable task = new UpdateTask(listAdapter);
        Thread thread = new Thread(task);
        thread.start();
    }

    class UpdateTask implements Runnable
    {
        private ArrayAdapter<String> adapter;
        private boolean logged = true;

        public UpdateTask(ArrayAdapter<String> adapter)
        {
            this.adapter = adapter;
        }

        public void loggedOut(boolean logged)
        {
            this.logged = logged;
        }

        public void run()
        {
            try
            { 
                while(logged)
                {
                    if(input.available() > 0)
                    {
                        String message = input.readUTF();
                        if(!message.equalsIgnoreCase("chat"))
                        {
                           users = getList(message);
                            adapter.notifyDataSetChanged();

                        }
                    }  
                    Thread.sleep(100);
                }
            }    
            catch(IOException ex)
            {
            }
            catch(InterruptedException ex)
            {
            }
        }
        public String[] getList(String message)
        {
            String line = message;
            String[] list;
            String[] split;
            int counter = 0;

            String temp = line.substring(1, line.length() - 1);
            split = temp.split(", ");
            if(split.length == 1)
            {
                list = new String[0];
            }
            else
            {
                list = new String[split.length - 1];
                for(int i = 0; i < split.length; i++)
                {
                    if(!split[i].equalsIgnoreCase(userName))
                    {
                        list[counter] = split[i];
                        counter++;
                    }
                }
        }

        return list;
    }
}

package com.example.socketconnection；
导入java.io.DataInputStream；
导入java.io.DataOutputStream；
导入java.io.IOException；
导入java.net.Socket；
导入java.util.List；
导入android.app.Activity；
导入android.content.Intent；
导入android.os.Bundle；
导入android.view.Menu；
导入android.widget.ArrayAdapter；
导入android.widget.ListView；
公共类UserList扩展活动
{
专用插座；
私有数据输入流输入；
私有数据输出流输出；
私有字符串用户名；
私有字符串[]用户；
@凌驾
创建时的公共void（Bundle savedInstanceState）
{
super.onCreate（savedInstanceState）；
setContentView（R.layout.activity\u user\u list）；
Intent=getIntent（）；
userName=intent.getStringExtra（MainActivity.EXTRA_消息）；
ListView用户列表=（ListView）findViewById（R.id.userList）；
用户=新字符串[0]；
ArrayAdapter listAdapter=新的ArrayAdapter（这是android.R.layout.simple_list_item_1，android.R.id.text1，用户）；
setAdapter（listAdapter）；
socket=Singleton.getInstance（）.getSocket（）；
input=Singleton.getInstance（）.getInput（）；
output=Singleton.getInstance（）.getOutput（）；
Runnable task=newupdatetask（listAdapter）；
线程线程=新线程（任务）；
thread.start（）；
}
类UpdateTask实现可运行
{
专用阵列适配器；
私有布尔值=真；
公共更新任务（ArrayAdapter适配器）
{
this.adapter=适配器；
}
公共无效日志（布尔值日志）
{
this.logged=logged；
}
公开募捐
{
尝试
{ 
同时（记录）
{
if（input.available（）>0）
{
字符串消息=input.readUTF（）；
如果（！message.equalsIgnoreCase（“聊天”））
{
用户=获取列表（消息）；
adapter.notifyDataSetChanged（）；
}
}  
睡眠（100）；
}
}    
捕获（IOEX异常）
{
}
捕获（中断异常例外）
{
}
}
公共字符串[]获取列表（字符串消息）
{
字符串行=消息；
字符串[]列表；
字符串[]拆分；
int计数器=0；
字符串温度=行子字符串（1，行长度（）-1）；
拆分=临时拆分（“，”）；
如果（split.length==1）
{
列表=新字符串[0]；
}
其他的
{
列表=新字符串[split.length-1]；
对于（int i=0；i

---

}

您不能用

单例.connect

调用像那样阻塞主applocation线程

---

相反，利用您可以在

doInBackground

：-）的上下文中安全地调用

connect

），然后可以在

onPostExecute

的主应用程序线程上下文中安全地执行依赖于您的结果的代码。您正在主线程中执行网络操作。创建AsyncTask并在后台方法中执行。

package com.example.socketconnection;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.Socket;
import java.util.List;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class UserList extends Activity 
{

    private Socket socket;
    private DataInputStream input;
    private DataOutputStream output;
    private String userName;
    private String [] users;

    @Override
    public void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_user_list);

        Intent intent = getIntent();
        userName = intent.getStringExtra(MainActivity.EXTRA_MESSAGE);



        ListView userList = (ListView)findViewById(R.id.userList);
        users = new String[0];
        ArrayAdapter<String> listAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, android.R.id.text1, users);
        userList.setAdapter(listAdapter);
        socket = Singleton.getInstance().getSocket();
        input = Singleton.getInstance().getInput();
        output = Singleton.getInstance().getOutput();
        Runnable task = new UpdateTask(listAdapter);
        Thread thread = new Thread(task);
        thread.start();
    }

    class UpdateTask implements Runnable
    {
        private ArrayAdapter<String> adapter;
        private boolean logged = true;

        public UpdateTask(ArrayAdapter<String> adapter)
        {
            this.adapter = adapter;
        }

        public void loggedOut(boolean logged)
        {
            this.logged = logged;
        }

        public void run()
        {
            try
            { 
                while(logged)
                {
                    if(input.available() > 0)
                    {
                        String message = input.readUTF();
                        if(!message.equalsIgnoreCase("chat"))
                        {
                           users = getList(message);
                            adapter.notifyDataSetChanged();

                        }
                    }  
                    Thread.sleep(100);
                }
            }    
            catch(IOException ex)
            {
            }
            catch(InterruptedException ex)
            {
            }
        }
        public String[] getList(String message)
        {
            String line = message;
            String[] list;
            String[] split;
            int counter = 0;

            String temp = line.substring(1, line.length() - 1);
            split = temp.split(", ");
            if(split.length == 1)
            {
                list = new String[0];
            }
            else
            {
                list = new String[split.length - 1];
                for(int i = 0; i < split.length; i++)
                {
                    if(!split[i].equalsIgnoreCase(userName))
                    {
                        list[counter] = split[i];
                        counter++;
                    }
                }
        }

        return list;
    }
}