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GlobalKey's currentState is null in newer Flutter versions ...

I'm building an application which shows found Bluetooth devices in a list. While searching these devices the app shows a RefreshIndicator ...

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查詢 「Flutter currentState」的人也找了：

  1. Flutter GlobalKey
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  3. Flutter GlobalKey context
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  4. Flutter State class
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  5. Flutter key
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  6. Flutter get current state from widget
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  7. Flutter Form
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  8. Flutter Navigator
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