Android Kotlin中Ant+设备重复选择：如何实现单次自动连接？

我正在用Kotlin开发Android应用，需要通过蓝牙连接支持ANT+协议的设备，获取踏频（Cadence）、速度（Speed）以及健身设备相关数据。目前的代码需要手动三次选择目标设备，请问有没有办法实现单次自动选择设备？

当前实现代码：

private fun setPanoramaChangeListener() {
    //some code
    setupAntSampler()
    //some code
}

private fun setupAntSampler() {
    bsdReleaseHandle = AntPlusBikeSpeedDistancePcc.requestAccess(
        this, this,
        mResultReceiver, mDeviceStateChangeReceiver
    )
}

var mResultReceiver: IPluginAccessResultReceiver<AntPlusBikeSpeedDistancePcc> =
    object :
        IPluginAccessResultReceiver<AntPlusBikeSpeedDistancePcc> {
        override fun onResultReceived(
            result: AntPlusBikeSpeedDistancePcc?,
            resultCode: RequestAccessResult?, initialDeviceState: DeviceState?
        ) {
            when (resultCode) {
                RequestAccessResult.SUCCESS -> {
                    HomeActivity.bsdPcc = result
                    subscribeToEvents()
                }
            }
            releaseHandle = AntPlusFitnessEquipmentPcc.requestNewOpenAccess(
                this@TourActivity,
                this@TourActivity, mPluginAccessResultReceiver, mDeviceStateChangeReceiver,
                mFitnessEquipmentStateReceiver
            )
        }

private fun subscribeToEvents() {
    bcPcc?.subscribeCalculatedCadenceEvent { _, _, calculatedCadence ->
        runOnUiThread {
            cadenceDoubleList.add(calculatedCadence.toDouble())
            if (maxCadence < calculatedCadence.toDouble())
                maxCadence = calculatedCadence.toDouble()
        }
    }
    bcPcc?.subscribeRawCadenceDataEvent { _, _, _, _ ->
        runOnUiThread {
            // 注释代码
        }
    }
    if (bcPcc?.isSpeedAndCadenceCombinedSensor == true) {
        runOnUiThread {
            bsdReleaseHandle = AntPlusBikeSpeedDistancePcc.requestAccess(
                this@TourActivity, bcPcc?.antDeviceNumber ?: 0, 0, true,
                mResultReceiver, mDeviceStateChangeReceiver
            )
        }
    } else {
        runOnUiThread {
            // 注释代码
        }
        bcPcc?.subscribeCumulativeOperatingTimeEvent { _, _, _ ->
            runOnUiThread {
                // 注释代码
            }
        }
        bcPcc?.subscribeManufacturerAndSerialEvent { _, _, _, _ ->
            runOnUiThread {
                // 注释代码
            }
        }
        bcPcc?.subscribeVersionAndModelEvent { _, _, _, _, _ ->
            runOnUiThread {
                // 注释代码
            }
        }
        bcPcc?.subscribeBatteryStatusEvent { _, _, _, _ ->
            runOnUiThread {
                // 注释代码
            }
        }
        bcPcc?.subscribeMotionAndCadenceDataEvent { _, _, _ ->
            runOnUiThread {
                // 注释代码
            }
        }
    }
}

解决方案：通过预扫描+指定设备号实现自动连接 #

当前代码需要三次手动选择的核心原因：多次调用无设备号的requestAccess/requestNewOpenAccess，每次都会触发系统选择弹窗；且在组合传感器逻辑中重复发起连接请求。可以通过以下步骤优化：

1. 预扫描并缓存目标设备信息

一次性扫描所有可用ANT+设备，筛选出需要的类型（踏频/速度传感器、健身设备），记录设备号（antDeviceNumber）：

private var cachedCadenceSpeedDeviceNumber: Int? = null
private var cachedFitnessDeviceNumber: Int? = null

private fun scanAntDevices() {
    val scanner = AntScanner(this)
    scanner.setScanCallback(object : AntScanner.ScanCallback {
        override fun onDeviceFound(device: AntDevice) {
            // 筛选目标设备类型
            when (device.deviceType) {
                AntDeviceType.TYPE_BIKE_SPEED_CADENCE -> {
                    cachedCadenceSpeedDeviceNumber = device.number
                }
                AntDeviceType.TYPE_FITNESS_EQUIPMENT -> {
                    cachedFitnessDeviceNumber = device.number
                }
            }
        }

        override fun onScanFinished() {
            // 扫描完成后自动连接所有缓存设备
            connectToAntDevices()
        }
    })
    scanner.startScan()
}

2. 指定设备号发起连接，跳过手动选择

直接用缓存的设备号调用连接API，避免触发选择弹窗：

private fun connectToAntDevices() {
    // 连接踏频/速度传感器
    cachedCadenceSpeedDeviceNumber?.let { deviceNumber ->
        bsdReleaseHandle = AntPlusBikeSpeedDistancePcc.requestAccess(
            this@TourActivity,
            deviceNumber,
            0,
            true, // 启用自动连接
            mBsdResultReceiver,
            mDeviceStateChangeReceiver
        )
    }

    // 连接健身设备
    cachedFitnessDeviceNumber?.let { deviceNumber ->
        releaseHandle = AntPlusFitnessEquipmentPcc.requestNewOpenAccess(
            this@TourActivity,
            this@TourActivity,
            mFitnessAccessResultReceiver,
            mDeviceStateChangeReceiver,
            mFitnessEquipmentStateReceiver
        )
    }
}

3. 优化传感器事件订阅逻辑

如果是踏频+速度组合传感器，无需重复发起连接，直接通过已有PCC实例订阅速度事件：

private fun subscribeToEvents() {
    bcPcc?.subscribeCalculatedCadenceEvent { _, _, calculatedCadence ->
        runOnUiThread {
            cadenceDoubleList.add(calculatedCadence.toDouble())
            if (maxCadence < calculatedCadence.toDouble())
                maxCadence = calculatedCadence.toDouble()
        }
    }

    // 组合传感器直接订阅速度事件，无需重新连接
    if (bcPcc?.isSpeedAndCadenceCombinedSensor == true) {
        bcPcc?.subscribeCalculatedSpeedEvent { _, _, calculatedSpeed ->
            runOnUiThread {
                // 处理速度数据逻辑
            }
        }
    } else {
        // 纯踏频传感器的事件订阅逻辑（保持原有代码）
    }
}

4. 修改初始化流程

将原来的setupAntSampler改为启动扫描：

private fun setupAntSampler() {
    scanAntDevices()
}

注意事项 #

• 权限配置：确保AndroidManifest.xml中添加ANT+权限：

  <uses-permission android:name="com.dsi.ant.permission.ANT" />
  <uses-permission android:name="com.dsi.ant.permission.ANT_ADMIN" />
  

• 首次配对：首次使用可能需要手动配对一次，之后可将设备号持久化存储（如SharedPreferences），下次启动直接连接。
• 错误处理：添加连接失败的回调逻辑，例如设备未找到时提示用户重新扫描。

内容的提问来源于stack exchange，提问作者bircastri