#Android9 查看连接多个蓝牙耳机查看使用中的蓝牙耳机
Android 9.0之后,支持一台手机可以同时连接多个蓝牙设备。
但是判断那个蓝牙设备是使用中,需要经过一些复杂判断才知道!
boolean a2dpPlaying = BluetoothA2dp.isA2dpPlaying(BluetoothDevice);
看起来不难,但是 BluetoothA2dp 和 BluetoothDevice 如何获取到?
BluetoothA2dp 获取需要连接服务,BluetoothDevice 遍历所有蓝牙即可。
BluetoothA2dp mA2dp;
public void initA2dpAdapter() {
BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
if (mBluetoothAdapter.isEnabled()) { //判断蓝牙是否开启
//获取A2DP代理对象
if (mA2dp == null) { //不能重复连接服务,否则会报错
mBluetoothAdapter.getProfileProxy(getContext(), mBluetoothProfileListener, BluetoothProfile.A2DP);
}
} else {
LogUtil.error("getA2dpAdapter error. bluetooth is not Enabled");
}
}
//getProfileProxy并不会直接返回A2DP代理对象,而是通过mListener中回调获取。
private BluetoothProfile.ServiceListener mBluetoothProfileListener = new BluetoothProfile.ServiceListener() {
@Override
public void onServiceDisconnected(int profile) {
if (profile == BluetoothProfile.A2DP) {
LogUtil.error("A2dp onServiceDisconnected ");
mA2dp = null;
}
}
// getProfileProxy 到 连接成功一般需要几十毫秒!
@Override
public void onServiceConnected(int profile, BluetoothProfile proxy) {
if (profile == BluetoothProfile.A2DP) {
LogUtil.error("A2dp onServiceConnected ");
mA2dp = (BluetoothA2dp) proxy; //转换 ,这个就是 BluetoothA2dp 对象
//不显示蓝牙界面连接耳机会出现多个连接状态的蓝牙耳机,断开非使用中的蓝牙耳机
judgeIsConnectManyBluetooth();
}
}
};
//判断所有的耳机设备是否存在多个连接状态的
private boolean isConnectManyBluetooth() {
//未从已连接设备列表中找到断开的api,从所有的设备列表中进行判断连接状态后断开
LocalBluetoothManager mBluetoothManager = LocalBluetoothManager.getInstance(context, mOnInitCallback);
Collection cachedDevices = mBluetoothManager.getCachedDeviceManager().getCachedDevicesCopy();
LogUtil.debug("cachedDevices size = " + cachedDevices.size());
//更新蓝牙列表UI
int 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;
}
//判断是否多个蓝牙连接状态,如果是就断开非使用中的蓝牙
private void judgeIsConnectManyBluetooth() {
if (isConnectManyBluetooth()) {
//获取当前使用中的蓝牙耳机对象,断开其他耳机对象
LocalBluetoothManager mBluetoothManager = LocalBluetoothManager.getInstance(context, mOnInitCallback);
Collection cachedDevices = mBluetoothManager.getCachedDeviceManager().getCachedDevicesCopy();
LogUtil.debug("cachedDevices size = " + cachedDevices.size());
//更新蓝牙列表UI
for (CachedBluetoothDevice cachedDevice : cachedDevices) {
String name = cachedDevice.getDevice().getName();
if (mA2dp != null && cachedDevice.getDevice() != null) {
boolean a2dpPlaying = mA2dp.isA2dpPlaying(cachedDevice.getDevice()); //判断蓝牙是否使用中!
if (a2dpPlaying) {
LogUtil.debug("cachedDevices a2dpPlaying name = " + name);
disconnectOtherExceptOne(name, cachedDevice.getDevice().getBluetoothClass().getMajorDeviceClass());
}
}
}
}
}
LocalBluetoothManager 这个类是SettingLib 里面的类,如果不是系统源码或者系统应用是调用不到的!可以用反射!
上面是实际项目中的一段代码,其实具体获取 BluetoothDevice api只有个两句:
CachedBluetoothDevice cachedDevice;//单个蓝牙对象
BluetoothDevice bluetoothDevice = cachedDevice.getDevice();
//已连接/绑定设备列表
Set bondedDevices = mBluetoothManager.getBluetoothAdapter().getBondedDevices();
BluetoothDevice 对象没有啥连接和断开操作的方法!只有一下配置信息。