[100分]去了很多论坛都没搞掂：socket客户端连续性出现2次联接服务端

[100分]去了很多论坛都没搞掂：socket客户端连续性出现2次连接服务端
故障现象：就是偶尔会出现    连续性连接了两次服务端，(不是每次，是偶尔)
从代码上看，应该不会出现这种情况的，但是不知道怎么回事，还是失败了！！
纳闷啊，不知道哪里有bug了。。。
路过的都看看，指教下~~


具体代码：
MainActivity.java:

public class MainActivity extends Activity {

        private Button startBtn = null;        

        private boolean flag = false;

        private SocketAutoConnect socketAutoConnect = null;

        @Override

        protected void onCreate(Bundle savedInstanceState) {

                super.onCreate(savedInstanceState);

                setContentView(R.layout.activity_main);

                startBtn = (Button) this.findViewById(R.id.btn_start);                

                startBtn.setOnClickListener(new OnClickListener() {

 

                        @Override

                        public void onClick(View v) {

                                if (!flag) {

                                        socketAutoConnect = new SocketAutoConnect();

                                        new Thread(socketAutoConnect, "SocketAutoConnect")

                                                        .start();

                                        flag = true;

                                } else {

                                        if(socketAutoConnect != null)

                                                socketAutoConnect.setSocketConnected(false);

                                        Toast.makeText(MainActivity.this, "重启socket",

                                                        Toast.LENGTH_LONG).show();

                                }

                        }

                });

        }

 

        public boolean onKeyDown(int keyCode, KeyEvent event) {

 

                if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) {

                        createExitDialog();

                }

                return super.onKeyDown(keyCode, event);

        }

 

        /**

         * 创建 退出确认的 窗口

         */

        public void createExitDialog() {

                AlertDialog.Builder exitDialog = new AlertDialog.Builder(this);

                exitDialog.setMessage("您确定退出?");

                exitDialog.setPositiveButton("退出",

                                new DialogInterface.OnClickListener() {

 

                                        public void onClick(DialogInterface dialog, int which) {

                                                System.exit(0);

                                        }

                                });

                exitDialog.setNegativeButton("取消", null);

                exitDialog.show();

        }

}

自动连接服务端的客户端
SocketAutoConnect.java:

public class SocketAutoConnect implements Runnable {

        private final String tag = "SocketAutoConnect";