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WebMar 8, 2024 · flutter widget super (key: key)的作用（五）. 在浏览flutter的代码的时候，会发现widget类总是有一个可选的key参数。. 那么为什么需要有这个参数呢？. 带着疑惑去研究了下，总算找到了答案。. key参数简单的理解，就是widget的id，用来标识某个widget。. 在我们根据自己的 ... black pacman frog WebMar 24, 2024 · BlocBuilder is working fine and responding to the state changes, however BlocListener seems to be not listening to the state change. class MyApp extends StatefulWidget { const MyApp({super.key});... black pacman wallpaper