#Android9 查看連接多個(gè)藍(lán)牙耳機(jī)查看使用中的藍(lán)牙耳機(jī)

Android 9.0之后，支持一臺(tái)手機(jī)可以同時(shí)連接多個(gè)藍(lán)牙設(shè)備。

但是判斷那個(gè)藍(lán)牙設(shè)備是使用中，需要經(jīng)過(guò)一些復(fù)雜判斷才知道！

一、主要api：

 boolean a2dpPlaying = BluetoothA2dp.isA2dpPlaying(BluetoothDevice);

看起來(lái)不難，但是 BluetoothA2dp 和 BluetoothDevice 如何獲取到？

BluetoothA2dp 獲取需要連接服務(wù)，BluetoothDevice 遍歷所有藍(lán)牙即可。

二、BluetoothA2dp 對(duì)象的獲取

BluetoothA2dp mA2dp；public void initA2dpAdapter() {BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();if (mBluetoothAdapter.isEnabled()) { //判斷藍(lán)牙是否開(kāi)啟//獲取A2DP代理對(duì)象if (mA2dp == null) { //不能重復(fù)連接服務(wù)，否則會(huì)報(bào)錯(cuò)mBluetoothAdapter.getProfileProxy(getContext(), mBluetoothProfileListener, BluetoothProfile.A2DP);}} else {LogUtil.error("getA2dpAdapter error. bluetooth is not Enabled");}}//getProfileProxy并不會(huì)直接返回A2DP代理對(duì)象，而是通過(guò)mListener中回調(diào)獲取。private BluetoothProfile.ServiceListener mBluetoothProfileListener = new BluetoothProfile.ServiceListener() {@Overridepublic void onServiceDisconnected(int profile) {if (profile == BluetoothProfile.A2DP) {LogUtil.error("A2dp onServiceDisconnected ");mA2dp = null;}}// getProfileProxy 到 連接成功一般需要幾十毫秒！@Overridepublic void onServiceConnected(int profile, BluetoothProfile proxy) {if (profile == BluetoothProfile.A2DP) {LogUtil.error("A2dp onServiceConnected ");mA2dp = (BluetoothA2dp) proxy; //轉(zhuǎn)換 ，這個(gè)就是  BluetoothA2dp 對(duì)象//不顯示藍(lán)牙界面連接耳機(jī)會(huì)出現(xiàn)多個(gè)連接狀態(tài)的藍(lán)牙耳機(jī)，斷開(kāi)非使用中的藍(lán)牙耳機(jī)judgeIsConnectManyBluetooth();}}};

三、獲取 BluetoothDevice 對(duì)象，

	//判斷所有的耳機(jī)設(shè)備是否存在多個(gè)連接狀態(tài)的private boolean isConnectManyBluetooth() {//未從已連接設(shè)備列表中找到斷開(kāi)的api，從所有的設(shè)備列表中進(jìn)行判斷連接狀態(tài)后斷開(kāi)LocalBluetoothManager mBluetoothManager = LocalBluetoothManager.getInstance(context, mOnInitCallback);Collection<CachedBluetoothDevice> cachedDevices = mBluetoothManager.getCachedDeviceManager().getCachedDevicesCopy();LogUtil.debug("cachedDevices size = " + cachedDevices.size());//更新藍(lán)牙列表UIint connectDevices = 0;for (CachedBluetoothDevice cachedDevice : cachedDevices) {String name = cachedDevice.getDevice().getName();if (cachedDevice.isConnected()) {LogUtil.debug("cachedDevices name = " + name);connectDevices++;}if (connectDevices > 1) {return true;}}return false;}//判斷是否多個(gè)藍(lán)牙連接狀態(tài)，如果是就斷開(kāi)非使用中的藍(lán)牙private void judgeIsConnectManyBluetooth() {if (isConnectManyBluetooth()) {//獲取當(dāng)前使用中的藍(lán)牙耳機(jī)對(duì)象，斷開(kāi)其他耳機(jī)對(duì)象LocalBluetoothManager mBluetoothManager = LocalBluetoothManager.getInstance(context, mOnInitCallback);Collection<CachedBluetoothDevice> cachedDevices = mBluetoothManager.getCachedDeviceManager().getCachedDevicesCopy();LogUtil.debug("cachedDevices size = " + cachedDevices.size());//更新藍(lán)牙列表UIfor (CachedBluetoothDevice cachedDevice : cachedDevices) {String name = cachedDevice.getDevice().getName();if (mA2dp != null && cachedDevice.getDevice() != null) {boolean a2dpPlaying = mA2dp.isA2dpPlaying(cachedDevice.getDevice());  //判斷藍(lán)牙是否使用中！if (a2dpPlaying) {LogUtil.debug("cachedDevices a2dpPlaying name = " + name);disconnectOtherExceptOne(name, cachedDevice.getDevice().getBluetoothClass().getMajorDeviceClass());}}}}}

LocalBluetoothManager 這個(gè)類(lèi)是SettingLib 里面的類(lèi)，如果不是系統(tǒng)源碼或者系統(tǒng)應(yīng)用是調(diào)用不到的！可以用反射！

上面是實(shí)際項(xiàng)目中的一段代碼，其實(shí)具體獲取 BluetoothDevice api只有個(gè)兩句：

CachedBluetoothDevice cachedDevice;//單個(gè)藍(lán)牙對(duì)象
BluetoothDevice  bluetoothDevice = cachedDevice.getDevice();

四、其他：

     //已連接/綁定設(shè)備列表Set<BluetoothDevice> bondedDevices = mBluetoothManager.getBluetoothAdapter().getBondedDevices();

BluetoothDevice 對(duì)象沒(méi)有啥連接和斷開(kāi)操作的方法！只有一下配置信息。