在BottomNavigationBar的图标上显示通知徽章 [英] Displaying notification badge on BottomNavigationBar's Icon
问题描述
我想在收到新消息时在BottomNavigationBar的 Icon 图标的右上角上显示通知徽章(彩色的大理石)已到达收件箱标签。它类似于 https://developer.android.com/preview/features/notification -badges.html ,但就我而言,它在应用程序中显示。
I'd like to display notification badge (a colored marble) on the top right corner of BottomNavigationBar's Icon widget when a new message has arrived in the inbox tab. It is similar to https://developer.android.com/preview/features/notification-badges.html but for my case it is displayed in-app.
任何在现有图标上绘制叠加层以创建自定义的提示图标类?
Any tips to paint the overlay on existing icon to create a custom Icon class?
推荐答案
是。可以通过使用 Stack
和 Positioned
小部件来堆叠两个图标来完成。
Yes. It can be done by stacking two icons using the Stack
and Positioned
widget.
new BottomNavigationBarItem(
title: new Text('Home'),
icon: new Stack(
children: <Widget>[
new Icon(Icons.home),
new Positioned( // draw a red marble
top: 0.0,
right: 0.0,
child: new Icon(Icons.brightness_1, size: 8.0,
color: Colors.redAccent),
)
]
),
)
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