Попытка подключения к Mi Band 2 через Bluetooth

Question

Я написал следующие функции

void getBoundedDevice() {

        mDeviceName = getIntent().getStringExtra(EXTRAS_DEVICE_NAME);
        mDeviceAddress = getIntent().getStringExtra(EXTRAS_DEVICE_ADDRESS);
        txtPhysicalAddress.setText(mDeviceAddress);

        Set<BluetoothDevice> boundedDevice = bluetoothAdapter.getBondedDevices();
        for (BluetoothDevice bd : boundedDevice) {
            if (bd.getName().contains("MI Band 2")) {
                txtPhysicalAddress.setText(bd.getAddress());
            }
        }
    }

    void initializeObjects() {
        bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
    }

    void initilaizeComponents() {
        btnStartConnecting = (Button) findViewById(R.id.btnStartConnecting);
        btnGetBatteryInfo = (Button) findViewById(R.id.btnGetBatteryInfo);
        btnWalkingInfo = (Button) findViewById(R.id.btnWalkingInfo);
        btnStartVibrate = (Button) findViewById(R.id.btnStartVibrate);
        btnStopVibrate = (Button) findViewById(R.id.btnStopVibrate);
        btnGetHeartRate = (Button) findViewById(R.id.btnGetHeartRate);
        txtPhysicalAddress = (EditText) findViewById(R.id.txtPhysicalAddress);
        txtState = (TextView) findViewById(R.id.txtState);
        txtByte = (TextView) findViewById(R.id.txtByte);
    }

    void initializeEvents() {
        btnStartConnecting.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startConnecting();
            }
        });
        btnGetBatteryInfo.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                getBatteryStatus();
            }
        });
        btnStartVibrate.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startVibrate();
            }
        });
        btnStopVibrate.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                stopVibrate();
            }
        });
        btnGetHeartRate.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                startScanHeartRate();
            }
        });
    }

    void startConnecting() {

        String address = txtPhysicalAddress.getText().toString();
        bluetoothDevice = bluetoothAdapter.getRemoteDevice(address);

        Log.v("test", "Connecting to " + address);
        Log.v("test", "Device name " + bluetoothDevice.getName());

        bluetoothGatt = bluetoothDevice.connectGatt(this, true, bluetoothGattCallback);

    }

    void stateConnected() {
        bluetoothGatt.discoverServices();
        MainActivity.this.runOnUiThread(new Runnable() {
            @Override
            public void run() {
                txtState.setText("Connected");
            }
        });
    }

    void stateDisconnected() {
        bluetoothGatt.disconnect();
        MainActivity.this.runOnUiThread(new Runnable() {
            @Override
            public void run() {
                txtState.setText("Disconnected");
            }
        });
    }

    void startScanHeartRate() {
        txtByte.setText("...");
        BluetoothGattCharacteristic bchar = bluetoothGatt.getService(CustomBluetoothProfile.HeartRate.service)
                .getCharacteristic(CustomBluetoothProfile.HeartRate.controlCharacteristic);
        bchar.setValue(new byte[]{21, 2, 1});
        bluetoothGatt.writeCharacteristic(bchar);
    }

    void listenHeartRate() {
        BluetoothGattCharacteristic bchar = bluetoothGatt.getService(CustomBluetoothProfile.HeartRate.service)
                .getCharacteristic(CustomBluetoothProfile.HeartRate.measurementCharacteristic);
        bluetoothGatt.setCharacteristicNotification(bchar, true);
        BluetoothGattDescriptor descriptor = bchar.getDescriptor(CustomBluetoothProfile.HeartRate.descriptor);
        descriptor.setValue(BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE);
        bluetoothGatt.writeDescriptor(descriptor);
        isListeningHeartRate = true;
    }

    void getBatteryStatus() {
        txtByte.setText("...");
        BluetoothGattCharacteristic bchar = bluetoothGatt.getService(CustomBluetoothProfile.Basic.service)
                .getCharacteristic(CustomBluetoothProfile.Basic.batteryCharacteristic);
        if (!bluetoothGatt.readCharacteristic(bchar)) {
            Toast.makeText(this, "Failed get battery info", Toast.LENGTH_SHORT).show();
        }

    }

    void startVibrate() {
        BluetoothGattCharacteristic bchar = bluetoothGatt.getService(CustomBluetoothProfile.AlertNotification.service)
                .getCharacteristic(CustomBluetoothProfile.AlertNotification.alertCharacteristic);
        bchar.setValue(new byte[]{2});
        if (!bluetoothGatt.writeCharacteristic(bchar)) {
            Toast.makeText(this, "Failed start vibrate", Toast.LENGTH_SHORT).show();
        }
    }

    void stopVibrate() {
        BluetoothGattCharacteristic bchar = bluetoothGatt.getService(CustomBluetoothProfile.AlertNotification.service)
                .getCharacteristic(CustomBluetoothProfile.AlertNotification.alertCharacteristic);
        bchar.setValue(new byte[]{0});
        if (!bluetoothGatt.writeCharacteristic(bchar)) {
            Toast.makeText(this, "Failed stop vibrate", Toast.LENGTH_SHORT).show();
        }
    }

    final BluetoothGattCallback bluetoothGattCallback = new BluetoothGattCallback() {

        @Override
        public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {
            super.onConnectionStateChange(gatt, status, newState);
            Log.v("test", "onConnectionStateChange");

            if (newState == BluetoothProfile.STATE_CONNECTED) {
                stateConnected();
            } else if (newState == BluetoothProfile.STATE_DISCONNECTED) {
                stateDisconnected();
            }

        }

        @Override
        public void onServicesDiscovered(BluetoothGatt gatt, int status) {
            super.onServicesDiscovered(gatt, status);
            Log.v("test", "onServicesDiscovered");
            listenHeartRate();
        }

        @Override
        public void onCharacteristicRead(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) {
            super.onCharacteristicRead(gatt, characteristic, status);
            Log.v("test", "onCharacteristicRead");
            byte[] data = characteristic.getValue();
            txtByte.setText(Arrays.toString(data));
        }

        @Override
        public void onCharacteristicWrite(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) {
            super.onCharacteristicWrite(gatt, characteristic, status);
            Log.v("test", "onCharacteristicWrite");
        }

        @Override
        public void onCharacteristicChanged(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic) {
            super.onCharacteristicChanged(gatt, characteristic);
            Log.v("test", "onCharacteristicChanged");
            byte[] data = characteristic.getValue();
            txtByte.setText(Arrays.toString(data));
        }

        @Override
        public void onDescriptorRead(BluetoothGatt gatt, BluetoothGattDescriptor descriptor, int status) {
            super.onDescriptorRead(gatt, descriptor, status);
            Log.v("test", "onDescriptorRead");
        }

        @Override
        public void onDescriptorWrite(BluetoothGatt gatt, BluetoothGattDescriptor descriptor, int status) {
            super.onDescriptorWrite(gatt, descriptor, status);
            Log.v("test", "onDescriptorWrite");
        }

        @Override
        public void onReliableWriteCompleted(BluetoothGatt gatt, int status) {
            super.onReliableWriteCompleted(gatt, status);
            Log.v("test", "onReliableWriteCompleted");
        }

        @Override
        public void onReadRemoteRssi(BluetoothGatt gatt, int rssi, int status) {
            super.onReadRemoteRssi(gatt, rssi, status);
            Log.v("test", "onReadRemoteRssi");
        }

        @Override
        public void onMtuChanged(BluetoothGatt gatt, int mtu, int status) {
            super.onMtuChanged(gatt, mtu, status);
            Log.v("test", "onMtuChanged");
        }

    };

И добавить эти функции в метод OnCreate ();

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        initializeObjects();
        initilaizeComponents();
        initializeEvents();

        getBoundedDevice();

    }

Программа подключается и работает примерно один раз, поэтому после Mi Band 2 автоматически отключается и необходимо перезапустить приложение для работы.Кроме того, некоторые функции, такие как запуск вибрации или остановка вибрации, не работают.Только рабочая функция запускает сердечный ритм, но только на один раз (решение перезапускает приложение).Так что проблема в нестабильности работы программы.Как я могу оптимизировать или стабильно.Может быть, я пропустил основной аспект