华为手机手写写不出来，可能手机屏幕是否出现失灵，需要联系售后维修；如果手机屏幕正常，可以在屏幕上进行其他的操作，那可能是手机输入法中对手写设置的问题导致的，检查输入法手写设置是否打开即可，将输入方式设
I have a Singleton class that manages the connection to an external device. The idea of my application is that I need that external device to be presented al开发者_如何学Pythonl the time when the appl
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