Introduction

Bottom sheets are a popular UI component used in mobile applications to display additional content or controls without navigating away from the main screen. The Google Maps app effectively utilizes the bottom sheet to present information like location names, directions, or additional details without disrupting the user's main task. This article discusses how you can mimic the bottom sheet functionality of the Maps app using common development frameworks like Android and iOS. We’ll explore technical aspects, implementation steps, and customization techniques.

Understanding Bottom Sheets

Types of Bottom Sheets

Bottom sheets generally come in two types:

• Persistent Bottom Sheets: These are displayed continuously on the screen and often provide secondary information or options.
• Modal Bottom Sheets: These are temporary and overlay the main content. They can be dismissed by either dragging down or tapping outside the sheet.

The Google Maps app primarily uses a combination of both to ensure usability and accessibility.

Key Characteristics

1. Expandable/Collapsible: Bottom sheets can expand to cover more of the screen or retract to provide more context of the main view.
2. Interactive Gestures: Use of swipe gestures for opening, closing, or interacting with the content.
3. Overlay and Background Dim: Usually, modal bottom sheets dim the background to maintain focus.

Implementing Bottom Sheets in Android

Libraries and Dependencies

To implement a bottom sheet in Android, consider using androidx components:

• Colors & Transparency: Use themes and styles for colors and transparency settings to suit your design language.
• Dynamic Content: Load dynamic content like location details or routes when the bottom sheet is expanded.
• Use the UISwipeGestureRecognizer for detecting user gestures if customization is needed.
• Detent Customization: Swift's .medium() and .large() provide different sizes; custom detents can be defined in SwiftUI.
• Dynamic Data: Update the content dynamically by observing changes in the model, useful for apps like Maps that display live data.
• Performance: Load data asynchronously to prevent UI blockage.
• Accessibility: Ensure your bottom sheet content is navigable with accessibility tools.
• Testing: Test on various devices and screen sizes to ensure the bottom sheet behaves as expected.