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並前往https://tw.coderbridge.com/questions/13dec3bea2944b6682dbcb994fb95a91

在Flutter 中獲取沒有buildcontext 的類中的屏幕大小(Getting ...

fromWindow(WidgetsBinding.instance.window);. you can use it to get MediaQuery without need context it depend on instance of window to get size information ...

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