App第一次运行可以连接，第二次就不行

[r00_a2lBUR]

我用C#做了一个TCP/IP服务器，用Android Studio做了一个手机端，手机端第一次运行的时候，按连接服务器按钮可以连接上服务器，但退出后，第二次就连不上，重装APP后又可以连上，这个是什么原因造成的？
附手机端进行TCP/IP连接的代码：

package com.example.administrator.handset_trade_zm;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;

/**
 * Created by Administrator on 2017-09-05.
 */

public class TcpClientConnector {

    private static TcpClientConnector mTcpClientConnector;
    private Socket mClient;
    private ConnectLinstener mListener;
    private Thread mConnectThread;

    public interface ConnectLinstener {
        void onReceiveData(String data);
    }

    public void setOnConnectLinstener(ConnectLinstener linstener) {
        this.mListener = linstener;
    }

    public static TcpClientConnector getInstance() {
        if (mTcpClientConnector == null)
            mTcpClientConnector = new TcpClientConnector();
        return mTcpClientConnector;
    }

    Handler mHandler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            switch (msg.what) {
                case 100:
                    if (mListener != null) {
                        mListener.onReceiveData(msg.getData().getString("data"));
                    }
                    break;
            }
        }
    };

    public void creatConnect(final String mSerIP, final int mSerPort) {
        if (mConnectThread == null) {
            mConnectThread = new Thread(new Runnable() {
                @Override
                public void run() {
                    try {
                        connect(mSerIP, mSerPort);
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            });
            mConnectThread.start();
        }
    }

    /**
     * 与服务端进行连接
     *
     * @throws IOException
     */
    private void connect(String mSerIP, int mSerPort) throws IOException {
        if (mClient == null) {
            mClient = new Socket(mSerIP, mSerPort);
        }
        InputStream inputStream = mClient.getInputStream();
        byte[] buffer = new byte[1024];
        int len = -1;
        while ((len = inputStream.read(buffer)) != -1) {
            String data = new String(buffer, 0, len);
            Message message = new Message();
            message.what = 100;
            Bundle bundle = new Bundle();
            bundle.putString("data", data);
            message.setData(bundle);
            mHandler.sendMessage(message);
        }
    }

    /**
     * 发送数据
     *
     * @param data 需要发送的内容
     */
    public void send(String data) throws IOException {
        OutputStream outputStream = mClient.getOutputStream();
        outputStream.write(data.getBytes());
    }

    /**
     * 断开连接
     *
     * @throws IOException
     */
    public void disconnect() throws IOException {
        if (mClient != null) {
            mClient.close();
            mClient = null;
        }
    }
}

连接按钮的代码：

    public void e_button_stoplinkserver_clicked(View view)
    {
        try
        {
            String sSend = "STOP";
            m_connector.send(sSend);
            m_connector.disconnect();
        }catch (Exception ex)
        {
            mTextView_Warning.setText("断开连接失败。");
        }
    }

[r00_a2lBUR]

连接时的代码：

    public void e_button_linkserver_clicked(View view)
    {
        mTextView_Op.setText("正在连接服务器...");
        mTextView_Notice.setText("");
        mTextView_Warning.setText("");
        m_connector = TcpClientConnector.getInstance();
        m_connector.creatConnect( m_sIP,m_iPort);
        m_connector.setOnConnectLinstener(new TcpClientConnector.ConnectLinstener() {
            @Override
            public void onReceiveData(String data) {
                //do somethings.
                mTextView_Notice.setText(data);
            }
        });
    }

[_乾坤_]

可能是有些资源没有释放。