Skip to main content

flutter - How to use PopupMenuItem onTap

Flutter - PopupMenuItem onTap
The PopupMenuButton class allows us to display a menu when pressed and calls onSelected when the menu is dismissed because an item was selected. The value passed to onSelected is the value of the selected menu item. The flutter developers can provide one of a child or an icon but not both. If developers provide an icon then PopupMenuButton behaves like an IconButton. If both child and icon are null, then a standard overflow icon is created depending on the platform.

The following flutter app development tutorial will demonstrate how to use the PopupMenuItem widget’s tap callback. Here we used the PopupMenuItem class’s onTap property to set the PupupMenuButton widget’s item tap callback.

The flutter PopupMenuItem class represents an item in a material design popup menu. Normally the child of a PopupMenuItem is a Text widget. But the flutter developers can build more complex items such as they can show both an icon and text inside an item.

The PopupMenuItem class onTap property value type is VoidCallback which is called when the menu item is tapped. The VoidCallback is a signature of callbacks that have no arguments and return no data.

So when the PopupMenuButton widget’s menu item is tapped then the flutter developers can get the tapped item details by using its onTap callback. Here we show a message on the app SnackBar when an item is tapped from the PopupMenuButton widget.

So finally, the flutter app developers can display a message to the app user when they tap an item from the PopupMenuButton widget. Or they can perform some other task when the user taps an item from the PopupMenuButton widget. But to do that they have to set an onTap callback for each PopupMenuItem instance.
main.dart

import 'package:flutter/material.dart';

void main() {runApp(const MyApp());}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
        theme: ThemeData(primarySwatch: Colors.pink),
        home: const MyHomePage()
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key}) : super(key: key);

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
          title: const Text("PopupMenuButton onTap"),
          actions: [
            PopupMenuButton(
                offset: const Offset(0,56),
                itemBuilder: (context)=>[
                  PopupMenuItem(
                    child: const Text("Share Location"),
                    onTap: (){
                      SnackBar snackBar = const SnackBar(
                          content: Text("Location Tapped")
                      );
                      ScaffoldMessenger.of(context).showSnackBar(snackBar);
                    },
                  ),
                  PopupMenuItem(
                    child: const Text("File Upload"),
                    onTap: (){
                      SnackBar snackBar = const SnackBar(
                          content: Text("Upload Tapped")
                      );
                      ScaffoldMessenger.of(context).showSnackBar(snackBar);
                    },
                  ),
                  PopupMenuItem(
                    child: const Text("Send Email"),
                    onTap: (){
                      SnackBar snackBar = const SnackBar(
                          content: Text("Contact Tapped")
                      );
                      ScaffoldMessenger.of(context).showSnackBar(snackBar);
                    },
                  )
                ]
            )
          ]
      ),
    );
  }
}
Labels:

Popular posts from this blog

Restricting Jetpack Compose TextField to Numeric Input Only

Jetpack Compose has revolutionized Android development with its declarative approach, enabling developers to build modern, responsive UIs more efficiently. Among the many components provided by Compose, TextField is a critical building block for user input. However, ensuring that a TextField accepts only numeric input can pose challenges, especially when considering edge cases like empty fields, invalid characters, or localization nuances. In this blog post, we'll explore how to restrict a Jetpack Compose TextField to numeric input only, discussing both basic and advanced implementations. Why Restricting Input Matters Restricting user input to numeric values is a common requirement in apps dealing with forms, payment entries, age verifications, or any data where only numbers are valid. Properly validating input at the UI level enhances user experience, reduces backend validation overhead, and minimizes errors during data processing. Compose provides the flexibility to implement ...
Read more

jetpack compose - TextField remove underline

Compose TextField Remove Underline The TextField is the text input widget of android jetpack compose library. TextField is an equivalent widget of the android view system’s EditText widget. TextField is used to enter and modify text. The following jetpack compose tutorial will demonstrate to us how we can remove (actually hide) the underline from a TextField widget in an android application. We have to apply a simple trick to remove (hide) the underline from the TextField. The TextField constructor’s ‘colors’ argument allows us to set or change colors for TextField’s various components such as text color, cursor color, label color, error color, background color, focused and unfocused indicator color, etc. Jetpack developers can pass a TextFieldDefaults.textFieldColors() function with arguments value for the TextField ‘colors’ argument. There are many arguments for this ‘TextFieldDefaults.textFieldColors()’function such as textColor, disabledTextColor, backgroundColor, cursorC...
Read more

jetpack compose - Image clickable

Compose Image Clickable The Image widget allows android developers to display an image object to the app user interface using the jetpack compose library. Android app developers can show image objects to the Image widget from various sources such as painter resources, vector resources, bitmap, etc. Image is a very essential component of the jetpack compose library. Android app developers can change many properties of an Image widget by its modifiers such as size, shape, etc. We also can specify the Image object scaling algorithm, content description, etc. But how can we set a click event to an Image widget in a jetpack compose application? There is no built-in property/parameter/argument to set up an onClick event directly to the Image widget. This android application development tutorial will demonstrate to us how we can add a click event to the Image widget and make it clickable. Click event of a widget allow app users to execute a task such as showing a toast message by cli...
Read more