java - 如何同时从两个服务读取值

Question

我正在开发一个使用 BLE 的项目，希望同时从两个服务中读取值，但我只从第一个服务中获取值

我的 onServicesDiscovered 代码是

public void onServicesDiscovered(BluetoothGatt gatt, int status) 
{
        for (BluetoothGattService service : gatt.getServices()) {
            if ((service == null) || (service.getUuid() == null)) {
                continue;
            }

            if (BleUuid.SERVICE_DEVICE_INFORMATION.equalsIgnoreCase(service
                    .getUuid().toString())) 
            {  
              mConnGatt.readCharacteristic(service.getCharacteristic(UUID.fromString(BleUuid.CHAR_MANUFACTURER_NAME_STRING)));
            }
            if (BleUuid.CHAR_ALERT_LEVEL.equalsIgnoreCase(service
                    .getUuid().toString())) 
            {
              mConnGatt.readCharacteristic(service.getCharacteristic(UUID.fromString(BleUuid.CHAR_SERIAL_NUMBEAR_STRING)));
            }

}

Answer 1

一次只能有一个未完成的 GATT 操作(readCharacteristic、writeCharacteristic、readDescriptor、writeDescriptor、requestMtu)。您需要等待相应的回调(onCharacteristicRead等)，直到您可以执行新的回调。