Android 扫描蓝牙设备并获取设备类型 |
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目前流行的蓝牙4.0标准包括传统的蓝牙(BT)和低功耗蓝牙模块(BLE)。 这里扫描的是传统蓝牙模块，先给出扫描结果： preview.gif 一，扫描Android扫描蓝牙设备是通过BluetoothAdapter启动蓝牙搜索，然后通过广播接收扫描的结果，其主要代码如下： 1，获取BluetoothAdapter 可通过单例模式直接获取 val btAdapt = BluetoothAdapter.getDefaultAdapter()2，开始扫描 if (!btAdapt.isDiscovering) { it.startDiscovery() }3,注册广播 val intent = IntentFilter() intent.apply { addAction(BluetoothDevice.ACTION_FOUND) addAction(BluetoothAdapter.ACTION_DISCOVERY_STARTED) addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED) addAction(BluetoothAdapter.ACTION_STATE_CHANGED) priority = IntentFilter.SYSTEM_HIGH_PRIORITY } registerReceiver(searchDevices, intent) private val searchDevices: BroadcastReceiver = object : BroadcastReceiver() { override fun onReceive(context: Context, intent: Intent) { when (intent.action) { BluetoothAdapter.ACTION_STATE_CHANGED -> { LogUtil.LOGE("ACTION_STATE_CHANGED") } BluetoothDevice.ACTION_FOUND -> { //found device val device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE) if (!device.name.isNullOrEmpty()) { // 得到设备对象 mData.add(device) adapter.notifyDataSetChanged() } } BluetoothAdapter.ACTION_DISCOVERY_STARTED -> { ToastUtil.show("正在扫描") } BluetoothAdapter.ACTION_DISCOVERY_FINISHED -> { ToastUtil.show("扫描完成，点击列表中的设备来尝试连接") } } } }拿到设备对象后即可在列表中展示，最后别忘了取消注册广播 二，获取蓝牙设备类型上面获取到的设备对象BluetoothDevice 有 device.getType()方法。查看源码可知，该方法返回的类型有 /** * Bluetooth device type, Unknown 未知类型 */ public static final int DEVICE_TYPE_UNKNOWN = 0; /** * Bluetooth device type, Classic - BR/EDR devices 传统类型 */ public static final int DEVICE_TYPE_CLASSIC = 1; /** * Bluetooth device type, Low Energy - LE-only ble类型 */ public static final int DEVICE_TYPE_LE = 2; /** * Bluetooth device type, Dual Mode - BR/EDR/LE 传统和ble双重类型 */ public static final int DEVICE_TYPE_DUAL = 3;我们来看一下手机自带的蓝牙扫描到的结果： mobile_list.png把device.getType()方法返回值和上面的做对比，可以发现该方法无法区分设备是手机类型，电脑类型还是耳机类型。 那么Android系统是如何区分的呢？ 命令行下输入如下命令： adb shell dumpsys window | findstr mCurrentFocus查看手机系统自带的蓝牙扫描界面结果如下： mCurrentFocus=Window{43e2635 u0 com.android.settings/com.android.settings.Settings$BluetoothSettingsActivity}因此查看android源码找到BluetoothSettingsActivity即可查看其如何实现，这里源码就不做深究，获取类型方式如下： // 获取类型对应的图标资源 int deviceTypeImg = BtUtil.getDeviceType(device.getBluetoothClass()); holder.ivType.setImageResource(deviceTypeImg);用到的工具类是在系统源码基础上做了修改，代码如下： public class BtUtil { public static final int PROFILE_HEADSET = 0; public static final int PROFILE_A2DP = 1; public static final int PROFILE_OPP = 2; public static final int PROFILE_HID = 3; public static final int PROFILE_PANU = 4; public static final int PROFILE_NAP = 5; public static final int PROFILE_A2DP_SINK = 6; public static int getDeviceType(BluetoothClass bluetoothClass) { if (bluetoothClass == null) { return R.drawable.ic_settings_bluetooth; } switch (bluetoothClass.getMajorDeviceClass()) { case BluetoothClass.Device.Major.COMPUTER: return R.drawable.ic_bt_laptop; case BluetoothClass.Device.Major.PHONE: return R.drawable.ic_bt_cellphone; case BluetoothClass.Device.Major.PERIPHERAL: return R.drawable.ic_bt_misc_hid; case BluetoothClass.Device.Major.IMAGING: return R.drawable.ic_bt_imaging; default: if (BtUtil.doesClassMatch(bluetoothClass, PROFILE_HEADSET)) return R.drawable.ic_bt_headset_hfp; else if (BtUtil.doesClassMatch(bluetoothClass, PROFILE_A2DP)) { return R.drawable.ic_bt_headphones_a2dp; } else { return R.drawable.ic_settings_bluetooth; } } } public static boolean doesClassMatch(BluetoothClass bluetoothClass, int profile) { if (profile == PROFILE_A2DP) { if (bluetoothClass.hasService(BluetoothClass.Service.RENDER)) { return true; } // By the A2DP spec, sinks must indicate the RENDER service. // However we found some that do not (Chordette). So lets also // match on some other class bits. switch (bluetoothClass.getDeviceClass()) { case BluetoothClass.Device.AUDIO_VIDEO_HIFI_AUDIO: case BluetoothClass.Device.AUDIO_VIDEO_HEADPHONES: case BluetoothClass.Device.AUDIO_VIDEO_LOUDSPEAKER: case BluetoothClass.Device.AUDIO_VIDEO_CAR_AUDIO: return true; default: return false; } } else if (profile == PROFILE_A2DP_SINK) { if (bluetoothClass.hasService(BluetoothClass.Service.CAPTURE)) { return true; } // By the A2DP spec, srcs must indicate the CAPTURE service. // However if some device that do not, we try to // match on some other class bits. switch (bluetoothClass.getDeviceClass()) { case BluetoothClass.Device.AUDIO_VIDEO_HIFI_AUDIO: case BluetoothClass.Device.AUDIO_VIDEO_SET_TOP_BOX: case BluetoothClass.Device.AUDIO_VIDEO_VCR: return true; default: return false; } } else if (profile == PROFILE_HEADSET) { // The render service class is required by the spec for HFP, so is a // pretty good signal if (bluetoothClass.hasService(BluetoothClass.Service.RENDER)) { return true; } // Just in case they forgot the render service class switch (bluetoothClass.getDeviceClass()) { case BluetoothClass.Device.AUDIO_VIDEO_HANDSFREE: case BluetoothClass.Device.AUDIO_VIDEO_WEARABLE_HEADSET: case BluetoothClass.Device.AUDIO_VIDEO_CAR_AUDIO: return true; default: return false; } } else if (profile == PROFILE_OPP) { if (bluetoothClass.hasService(BluetoothClass.Service.OBJECT_TRANSFER)) { return true; } switch (bluetoothClass.getDeviceClass()) { case BluetoothClass.Device.COMPUTER_UNCATEGORIZED: case BluetoothClass.Device.COMPUTER_DESKTOP: case BluetoothClass.Device.COMPUTER_SERVER: case BluetoothClass.Device.COMPUTER_LAPTOP: case BluetoothClass.Device.COMPUTER_HANDHELD_PC_PDA: case BluetoothClass.Device.COMPUTER_PALM_SIZE_PC_PDA: case BluetoothClass.Device.COMPUTER_WEARABLE: case BluetoothClass.Device.PHONE_UNCATEGORIZED: case BluetoothClass.Device.PHONE_CELLULAR: case BluetoothClass.Device.PHONE_CORDLESS: case BluetoothClass.Device.PHONE_SMART: case BluetoothClass.Device.PHONE_MODEM_OR_GATEWAY: case BluetoothClass.Device.PHONE_ISDN: return true; default: return false; } } else if (profile == PROFILE_HID) { return (bluetoothClass.getDeviceClass() & BluetoothClass.Device.Major.PERIPHERAL) == BluetoothClass.Device.Major.PERIPHERAL; } else if (profile == PROFILE_PANU || profile == PROFILE_NAP) { // No good way to distinguish between the two, based on class bits. if (bluetoothClass.hasService(BluetoothClass.Service.NETWORKING)) { return true; } return (bluetoothClass.getDeviceClass() & BluetoothClass.Device.Major.NETWORKING) == BluetoothClass.Device.Major.NETWORKING; } else { return false; } } }最终实现效果如下图： preview.gif |
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