Android蓝牙连接状态检测

private void checkConnectState() {
        ArrayList deviceList = new ArrayList();

        BluetoothAdapter adapter = BluetoothAdapter.getDefaultAdapter();
        Class bluetoothAdapterClass = BluetoothAdapter.class;//得到BluetoothAdapter的Class对象
        try {
            //得到连接状态的方法
            Method method = bluetoothAdapterClass.getDeclaredMethod("getConnectionState", (Class[]) null);
            //打开权限
            method.setAccessible(true);
            int state = (Integer) method.invoke(adapter, (Object[]) null);
            if (state == BluetoothAdapter.STATE_CONNECTED) {
                Log.i("BLUETOOTH", "BluetoothAdapter.STATE_CONNECTED");
                Set devices = adapter.getBondedDevices();
                Log.i("BLUETOOTH", "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.i("BLUETOOTH", "connected:" + device.getName());
                        deviceList.add(device);
                    }
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }