flutter dart 在下拉列表 DropdownMenuItem和DropdownButton 报错
════════ Exception caught by widgets library ═══════════════════════════════════════════════════════
The following assertion was thrown building StatefulBuilder(dirty, state: _StatefulBuilderState#87d0c):
There should be exactly one item with [DropdownBu..
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2020-08-20 18:54:31 ·
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