检查蓝牙是否连接

//

 /**
     * 检查蓝牙是否连接
     */
    private BroadcastReceiver mBlueToothReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
            if (BluetoothAdapter.ACTION_STATE_CHANGED.equals(action)) {
                if (intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, -1)
                        == BluetoothAdapter.STATE_OFF) {
                    Log.i("Lemon", "蓝牙设备关闭");
                }
            }
            if (mUpdatePresenter.containsIOProcessor(NewBlueToothReceiver.SingletonHolder.INSTANCE)) {
                if (BluetoothDevice.ACTION_FOUND.equals(action)) {
                    /**
                     * 找到蓝牙设备
                     */
                    BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                    NewBlueToothReceiver.SingletonHolder.INSTANCE.setCurrentAddress(device.getAddress());
                }
            }
        }