获取当前链接的蓝牙设备

获取当前链接的蓝牙设备

目前Android提供的API只能获取已经链接的设备，但是不能获取当前蓝牙链接的设备。
利用反射可以获取当前蓝牙连接的设备，跟去getBondedDevices获取已绑定的蓝牙连接，然后遍历BluetoothDevice,同样利用反射的方法调用BluetoothDevice的isConnected方法。成功获取。代码如下：

BluetoothAdapter _bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();

void initBlue () throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
    Class bluetoothAdapterClass = BluetoothAdapter.class;//得到BluetoothAdapter的Class对象
    //得到蓝牙状态的方法
    Method method = bluetoothAdapterClass.getDeclaredMethod(“getConnectionState", (Class[]) null);
    //打开权限
    method.setAccessible(true);
    int state = (int) method.invoke(_bluetoothAdapter, (Object[]) null);

    if (state == BluetoothAdapter.STATE_CONNECTED) {
        
        Set devices = _bluetoothAdapter.getBondedDevices();
        Log.d("LUYU", "devices:" + devices.size());
        for (BluetoothDevice device : devices) {

            Method isConnectedMethod = BluetoothDevice.class.getDeclaredMethod("isConnected", (Class[]) null);
            method.setAccessible(true);
            boolean isConnected = (boolean) isConnectedMethod.invoke(device, (Object[]) null);

            if (isConnected) {
                Log.d(“LUYU”, “connected:”+device.getName());
                //return device.getAddress();
            }
        }
    }else {
        Log.d(“LUYU”, “initBlue: “);
    }
}