尝试通过蓝牙连接到Mi Band 2

Question

我已经写了下一个函数

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");
        }

    };

并将这些函数添加到方法OnCreate（）;

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

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

        getBoundedDevice();

    }

程序正在连接并工作一次，因此在Mi Band 2自动断开连接后需要重新启动应用程序才能工作。此外，启动振动或停止振动等功能也无法正常工作。只有工作功能是开始心率，但只有一次（解决方案是重新启动应用程序）。所以问题是程序工作的不稳定性。我如何优化或稳定。可能是我错过了主要方面