我想从我的Mi Band 2通过BluetoothLe获取心率。我试图按照Getting Started with Bluetooth Low Energy的示例进行操作，但没有成功从心率中写入值。我想我想念一些东西，但我无法意识到。这是我第一次使用蓝牙和智能手环。我希望你能帮助我。我不知道是否应该将{0x01} byte用作启动心率传感器。
因此，按照该示例，我下载了BluetoothLeDemo应用程序，然后从那里获得了BleWrapper BleDefinedUUIDs和BleNamesResolver。我有2个按钮扫描并停止。我创建了一个名为mBleWrapper的BleWrapper，用于将其用于开始扫描和停止扫描。
mBleWrapper = new BleWrapper(this, new BleWrapperUiCallbacks.Null(){
@Override
public void uiDeviceConnected(BluetoothGatt gatt, BluetoothDevice device) {
super.uiDeviceConnected(gatt, device);
}
@Override
public void uiDeviceDisconnected(BluetoothGatt gatt, BluetoothDevice device) {
super.uiDeviceDisconnected(gatt, device);
}
@Override
public void uiAvailableServices(BluetoothGatt gatt, BluetoothDevice device, List<BluetoothGattService> services) {
super.uiAvailableServices(gatt, device, services);
BluetoothGattCharacteristic c=null;
for(BluetoothGattService service : services) {
String serviceName = BleNamesResolver.resolveUuid(service.getUuid().toString());
Log.i("SERVIDE", serviceName);
}
}
c=gatt.getService(BleDefinedUUIDs.Service.HEART_RATE).getCharacteristic(BleDefinedUUIDs.Characteristic.HEART_RATE_MEASUREMENT);
mBleWrapper.writeDataToCharacteristic(c, new byte[]{0x01});
mState = mSensorState.ACC_ENABLE;
}
@Override
public void uiCharacteristicForService(BluetoothGatt gatt, BluetoothDevice device, BluetoothGattService service, List<BluetoothGattCharacteristic> chars) {
super.uiCharacteristicForService(gatt, device, service, chars);
}
@Override
public void uiCharacteristicsDetails(BluetoothGatt gatt, BluetoothDevice device, BluetoothGattService service, BluetoothGattCharacteristic characteristic) {
super.uiCharacteristicsDetails(gatt, device, service, characteristic);
}
@Override
public void uiNewValueForCharacteristic(BluetoothGatt gatt, BluetoothDevice device, BluetoothGattService service, BluetoothGattCharacteristic ch, String strValue, int intValue, byte[] rawValue, String timestamp) {
super.uiNewValueForCharacteristic(gatt, device, service, ch, strValue, intValue, rawValue, timestamp);
switch (mState) {
case ACC_READ:
Log.i("READ", "heart rate dta");
}
Log.i("Value", "Val" + intValue);
}
@Override
public void uiGotNotification(BluetoothGatt gatt, BluetoothDevice device, BluetoothGattService service, BluetoothGattCharacteristic characteristic) {
super.uiGotNotification(gatt, device, service, characteristic);
String ch = BleNamesResolver.resolveCharacteristicName(characteristic.getUuid().toString());
Log.d("AAA", "uiGotNotification: " + ch);
}
@Override
public void uiSuccessfulWrite(BluetoothGatt gatt, BluetoothDevice device, BluetoothGattService service, BluetoothGattCharacteristic ch, String description) {
super.uiSuccessfulWrite(gatt, device, service, ch, description);
BluetoothGattCharacteristic c;
switch (mState) {
case ACC_ENABLE:
Log.i("ENABLED", "Heart Rate enabled");
c = gatt.getService(BleDefinedUUIDs.Service.HEART_RATE).getCharacteristic(BleDefinedUUIDs.Characteristic.HEART_RATE_MEASUREMENT);
mBleWrapper.requestCharacteristicValue(c);
mState = mSensorState.ACC_READ;
break;
case ACC_READ:
Log.i("WRITE", "SUCCESSfule write");
break;
}
}
@Override
public void uiFailedWrite(BluetoothGatt gatt, BluetoothDevice device, BluetoothGattService service, BluetoothGattCharacteristic ch, String description) {
super.uiFailedWrite(gatt, device, service, ch, description);
switch (mState) {
case ACC_ENABLE:
Log.i("FAILED", "Feailed to enbale Heart Rate");
}
}
@Override
public void uiNewRssiAvailable(BluetoothGatt gatt, BluetoothDevice device, int rssi) {
super.uiNewRssiAvailable(gatt, device, rssi);
}
@Override
public void uiDeviceFound(BluetoothDevice device, int rssi, byte[] record) {
super.uiDeviceFound(device, rssi, record);
String msg = "uiDeviceFound: "+device.getAddress()+","+device.getName();
if(devicesList.contains(device)==false) {
Log.i("Devicce", "deviceFound: " + msg);
devicesList.add(device);
genericListAdapter.notifyDataSetChanged();
}
}
});
我显示找到的所有设备，其中有ListView和onClick我想连接到该项目并将心率写入日志。
deviceListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
BluetoothGatt gatt;
BluetoothGattCharacteristic c;
connectDevice((BluetoothDevice) parent.getItemAtPosition(position));
Log.i("Read", "Get Heart Rate");
if(mBleWrapper.isConnected()==false){
Log.i("not connected", "NOT CONNECTE");
return;
}
gatt = mBleWrapper.getGatt();
c = gatt.getService(BleDefinedUUIDs.Service.HEART_RATE).getCharacteristic(BleDefinedUUIDs.Characteristic.HEART_RATE_MEASUREMENT);
mBleWrapper.requestCharacteristicValue(c);
mState=mSensorState.ACC_READ;
}
});
我还在BleWrapper类onDescpritorWriter中添加了
@Override
public void onDescriptorWrite(BluetoothGatt gatt, BluetoothGattDescriptor descriptor, int status) {
super.onDescriptorWrite(gatt, descriptor, status);
String deviceName = gatt.getDevice().getName();
String serviceName = BleNamesResolver.resolveServiceName(descriptor.getCharacteristic().getService().getUuid().toString().toLowerCase(Locale.getDefault()));
String charName = BleNamesResolver.resolveCharacteristicName(descriptor.getCharacteristic().getUuid().toString().toLowerCase(Locale.getDefault()));
String description = "Device: " + deviceName + " Service: " + serviceName + " Characteristic: " + charName;
if(status == BluetoothGatt.GATT_SUCCESS) {
mUiCallback.uiSuccessfulWrite(mBluetoothGatt, mBluetoothDevice, mBluetoothSelectedService, descriptor.getCharacteristic(), description);
}
else {
mUiCallback.uiFailedWrite(mBluetoothGatt, mBluetoothDevice, mBluetoothSelectedService, descriptor.getCharacteristic(), description + " STATUS = " + status);
}
}
对于我使用的UUIDS服务
UUID HEART_RATE = UUID.fromString("0000180d-0000-1000-8000-00805f9b34fb");
以及特色学
UUID HEART_RATE_MEASUREMENT = UUID.fromString("00002a37-0000-1000-8000-00805f9b34fb");
在其他示例中，我看到它们也使用UUIDS作为描述符，但我没有。我知道这是一个冗长的问题，但是请您确实需要一些帮助。
答案 0 :(得分：0)
有些事情你可以检查一下。
显然，您已经成功发现了周围的设备。根据{{3}}（蓝牙官方文件）心率服务（UUID：180d）需要先将通知设置为TRUE。像这样：
BluetoothGattDescriptor descriptor = gattCharacteristic.getDescriptor(Client_Characteristic_Configuration);
descriptor.setValue((BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE));
gatt.writeDescriptor(descriptor);
之后，您可能会在覆盖功能中获得数据：
public void onDescriptorWrite(BluetoothGatt gatt, BluetoothGattDescriptor descriptor, int status)
通过这种方式：
BluetoothGattCharacteristic Char = gatt.getService(FORA_SERVICE_UUID).getCharacteristic(The uuid you want to connect);
byte[] data = Char.getValue();
也许您可以显示示例链接。可以更清楚地知道您使用过什么。