To add a drawer to the app, wrap it in a Scaffold widget. Before going to use this first check the default Snackbar. In Flutter's I/flutter (11947): material library, that material is represented by the Material widget. 将 RaisedButton 单独用一个 class 封装一 … appBar: AppBar( Add a Drawer to a screen. The Scaffold widget provides a consistent visual structure to apps 2. They help us to know which pages are the most and least popular and see how visitors move around the site. On mobile it shows a list and pushes to details and on tablet it shows the List and the selected item. It's unlikely to actually be a BottomSheet, which is used by the implementations of showBottomSheet and showModalBottomSheet. If you do not allow these cookies we will not know when you have visited our site, and will not be able to monitor its performance. This I / flutter (20636): usually happens when the context provided is from the same StatefulWidget as that whose build I / flutter (20636): function actually creates the Scaffold widget … responsive_scaffold #. 3. Typically, the Scaffold widget is introduced by the MaterialApp or WidgetsApp widget at the top of your application widget tree. See also: showBottomSheet, which displays a bottom sheet as a route that can be dismissed with the scaffold's back button. I/flutter (11947): IconButton widgets require a Material widget ancestor. Scaffold widgets require a ScaffoldMessenger widget ancestor. No Scaffold widget found. There are currently 3 users online. I / flutter (20636): No Scaffold ancestor could be found starting from the context that was passed to Scaffold. I/flutter (11947): No Material widget found. Most users ever online was 147 at 15:44 on 03-10-2018. No ScaffoldMessenger widget found. I/flutter (25517): To introduce a Material widget, you can either directly include one, or use a widget that contains I/flutter (25517): Material itself, such as a Card, Dialog, Drawer, or Scaffold. Responsive Scaffold - On mobile it shows a list and pushes to details and on tablet it shows the List and the selected item. E/flutter (17371): No Scaffold ancestor could be found starting from the context that was passed to Scaffold.of(). Scaffold.of() called with a context that does not contain a Scaffold. Create a Scaffold. 0 members and 3 guests.. No Scaffold ancestor could be found starting from the context that was passed to Scaffold.of(). Populate the drawer with items. 4. This usually happens when the context provided is from the same StatefulWidget as that whose build function actually creates the Scaffold widget being sought. The value of bottomSheet can be any widget at all. View the online demo here!. I/flutter (11947): In material design, most widgets are conceptually "printed" on a sheet of material. Flutter provided a widget called Snackbar widget, which is used to show Quick information/messages to users on the current screen. Close the drawer programmatically. Navigation Drawer using Flutter. Add a drawer. Typically, the ScaffoldMessenger widget is introduced by the MaterialApp at the top of your application widget … I/flutter (25517): The specific widget that could not find a Material ancestor was: 重点是：“ No Material widget found… In this post we cover 1) How to fix Scaffold.of() called with a context that does not contain a Scaffoldshow exception 2) Show snackbar with flushbar plugin. Typically it's a widget that includes Material. 6.2 解决方案. 1. All information these cookies collect is aggregated and therefore anonymous. of (). This usually happens when the context provided is from the same StatefulWidget as that whose build function actually creates the Scaffold widget being sought.