Flutter-收到通知时更改应用栏图标 [英] Flutter - change appbar icon when receiving notification

问题描述

我正在使用FirebaseMessaging在我的应用程序上推送通知.

I am using FirebaseMessaging to push notifications on my app.

因此我可以使用以下代码处理这些通知:

So I can handle these notification with this code :

firebaseMessaging.configure(
    onLaunch: (Map<String, dynamic> msg) {
  print("onLaunch called");
}, onResume: (Map<String, dynamic> msg) {
  print("onResume called");
}, onMessage: (Map<String, dynamic> msg) {
  print("onMessage called : " + msg.toString());
});

收到通知后，我想在应用栏中的图标上显示这个小"1"

When I receive a notification, I want to display this little '1' on my icon in my appbar

我的问题是:我不知道如何动态更改应用程序栏上所有页面的响铃图标(而且我无法在应用程序栏中调用setState)

My problem is : I don't know how to change my bell icon dynamically on my appbar for all pages (and I can't call setState in my appbar)

推荐答案

我认为解决您的问题非常简单，您只需要使用Stateful类和自定义图标即可，如下所示:

I think is pretty simple to solve your problem you only need to use a Stateful class and a custom icon as below snippet:

Widget myAppBarIcon(){
return Container(
  width: 30,
  height: 30,
  child: Stack(
    children: [
      Icon(
        Icons.notifications,
        color: Colors.black,
        size: 30,
      ),
      Container(
        width: 30,
        height: 30,
        alignment: Alignment.topRight,
        margin: EdgeInsets.only(top: 5),
        child: Container(
          width: 15,
          height: 15,
          decoration: BoxDecoration(
              shape: BoxShape.circle,
              color: Color(0xffc32c37),
              border: Border.all(color: Colors.white, width: 1)),
          child: Padding(
            padding: const EdgeInsets.all(0.0),
            child: Center(
              child: Text(
                _counter.toString(),
                style: TextStyle(fontSize: 10),
              ),
            ),
          ),
        ),
      ),
    ],
  ),
);
}

，稍后您可以在应用程序栏上添加此图标(领导或操作).正如您看到的那样，当我启动新的Flutter项目时，以示例代码为基础的任何触摸都会改变Text值，它包含一种计算触摸浮动按钮并更改状态的次数的方法:

and later you can include this icon on your app bar(leading or action). As you can see the Text value change with any touch I used as base the example code when you start a new Flutter project it contains a method to count how many times you touch the floating button and change the state:

void _incrementCounter() {
setState(() {
  _counter++;
});
}

希望对您有帮助

这是我的示例

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