Create an Expandable Notification Containing Some Text in Android - Software Development PDF Download

• Create an Expandable Notification Containing Some Text in Android

• Last Updated : 01 Sep, 2020

• Notifications in mobile applications are messages that prompt users to interact with the app, ranging from updates to important alerts.
• They typically consist of a title, a line of text, and possible actions for the user.
• Expandable notifications offer more detailed information and can be seen in apps like WhatsApp and Gmail.
• These notifications allow users to view additional details like sender name, subject, and message snippets.

• Steps to Create a Notification:

• Step 1: Create a new project
• Begin by generating a new project in Android Studio. Refer to the guide on initiating a new project.
• Step 2: Modify the activity_main.xml file
• In the XML file, insert a button that, when clicked, triggers the creation of an expandable notification. Expanding this notification in the drawer reveals additional text.

Creating Notifications in Android

• Define the layout of the notification by creating an XML file in the res/layout directory.
• Include a Button element with the specified attributes like id, layout_width, layout_height, text, and layout_centerInParent.
• Modify the MainActivity file in Kotlin to implement the notification functionality.

Defining Notification Layout

When creating a notification in Android, it is essential to define its layout through an XML file. This file resides in the res/layout directory and specifies the visual components of the notification.

Button Element Attributes

The Button element in the notification layout XML should have the following attributes:

• id: Specifies the unique identifier for the Button.
• layout_width: Determines the width of the Button.
• layout_height: Sets the height of the Button.
• text: Defines the text displayed on the Button.
• layout_centerInParent: Positions the Button at the center of its parent layout.

Setting Notification Style in Android

After defining the notification layout, the next step involves setting the style of the notification in Android. This includes creating a notification with basic content and applying a style object using setStyle().

Building Notification with Basic Content

To initiate, construct a notification containing fundamental information, as outlined in the notification creation process.

Applying Notification Style

Utilize the setStyle() method along with a style object to enhance the notification appearance. This involves providing data that aligns with predefined templates for the notification.

MainActivity Class Overview

• The MainActivity class is a crucial component in Android development.
• It extends AppCompatActivity and is responsible for managing the main activity of the application.
• Within this class, notifications are created and managed.

Notification Setup Process

• The process involves the following key steps:
• Initialization of variables for Notification Manager, Channel, and Builder.
• Definition of ChannelID and Description for the custom notification.
• Creation of a message to be displayed in the notification.
• Evaluation of the API level to determine the notification's appearance.

Notification Creation Logic

• When a button is clicked, a notification is generated.
• The notification message is set based on a predefined string.
• If the API level is 26 or higher, a styled notification is created.
• If the API level is below 26, a default notification is displayed.

Code Snippet Explanation

Example:

• For instance, when the user taps a specific button in an app, a notification pops up with a custom message.
• If the device's API level is 26 or higher, the notification is styled with additional features like color and vibration.

Important Note

• If you have previously searched for the code for expandable notifications, you might have come across similar lines of code.

Important Information

• Note:
  • Using NotificationCompat.BigTextStyle().bigText(message) is not recommended.
  • Instead of NotificationCompat, utilize Notification to prevent crashes.

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