Android判断设备是否已连接经典蓝牙

    /**
     * 判断给定的设备mac地址是否已连接经典蓝牙
     *
     * @param macAddress 设备mac地址,例如"78:02:B7:01:01:16"
     * @return
     */
    public static boolean isConnectClassicBT(String macAddress) {
        if (TextUtils.isEmpty(macAddress)) {
            return false;
        }
        final BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
        Class bluetoothAdapterClass = BluetoothAdapter.class;//得到BluetoothAdapter的Class对象
        try {
            //是否存在连接的蓝牙设备
            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) {
                Log.d("test", "BluetoothAdapter.STATE_CONNECTED");
                Set devices = bluetoothAdapter.getBondedDevices();
                Log.d("test", "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) {
                        {
                            return macAddress.contains(device.getAddress());
                        }
                    } else {
                        Log.d("test", device.getName() + " connect false(" + device.getAddress() + ")");
                    }
                }

            }
            return false;
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
    }