我无法处理从Android上的蓝牙收到的值

Question

我的问题是：当我使用Arduino和HC 06蓝牙模块从arduino收到特定消息时，我尝试制作一个自动运行的秒表。我已经完成了Android程序。我无法使用来自蓝牙的消息。我收到一条消息（我的消息是“ 7”和“ 9”）。 if（value ==“ 7”）我不知道在哪里以及如何使用它。当我尝试将readMessage转换为整数时，程序无法打开并返回错误

mHandler = new Handler(){
                public void handleMessage(android.os.Message msg){
                String  readMessage = null;
                if(msg.what == MESSAGE_READ){

                    try {
                        readMessage = new String((byte[]) msg.obj, "UTF-8");
                        deger= readMessage;

                    } catch (UnsupportedEncodingException e) {
                        e.printStackTrace();
                    }
                    mReadBuffer.setText(readMessage);



                }
                if(msg.what == CONNECTING_STATUS){
                    if(msg.arg1 == 1)
                        mBluetoothStatus.setText("Cihaza Bağlandı: " + (String)(msg.obj));
                    else
                        mBluetoothStatus.setText("Bağlantı Başarısız");
                }
            }
        };
.
.
.
public void run() {
            byte[] buffer = new byte[256];
            int bytes;

            while (true) {
                try {
                    bytes = mmInStream.read(buffer);
                    if(bytes != 0) {

                        SystemClock.sleep(1000);

                        bytes = mmInStream.available();
                        bytes = mmInStream.read(buffer, 0, bytes);
                        mHandler.obtainMessage(MESSAGE_READ, bytes, -1, buffer)
                                .sendToTarget();
                    }
                } catch (IOException e) {
                    e.printStackTrace();

                    break;
                }
            }

//not work
new Thread()
            {
                public void  run()
                {


                    if(deger=="7")
                            {
                            StartTime = SystemClock.uptimeMillis();
                            sHandler.postDelayed(runnable, 0);
                            reset.setEnabled(true);
                            }

                }
            }.start();
        }

//not work
 mHandler = new Handler(){
                public void handleMessage(android.os.Message msg){
                String  readMessage = null;
                if(msg.what == MESSAGE_READ){

                    try {
                        readMessage = new String((byte[]) msg.obj, "UTF-8");
                        readMessage;
if(readmessage=="7")
                            {
                            StartTime = SystemClock.uptimeMillis();
                            sHandler.postDelayed(runnable, 0);
                            reset.setEnabled(true);
                            }


                    } catch (UnsupportedEncodingException e) {
                        e.printStackTrace();
                    }
                    mReadBuffer.setText(readMessage);



                }
                if(msg.what == CONNECTING_STATUS){
                    if(msg.arg1 == 1)
                        mBluetoothStatus.setText("Cihaza Bağlandı: " + (String)(msg.obj));
                    else
                        mBluetoothStatus.setText("Bağlantı Başarısız");
                }
            }
        };