how to implement this Bottomsheet using Jetpack Compose? – Android

The Problem:

Design a flexible BottomSheet using Jetpack Compose that allows customization of the UI and its elements to match a provided screenshot design.

The Solutions:

Solution 1: Implementing Custom Modal Bottom Sheet using Jetpack Compose

1. Declare Variables and Define Coroutine Scope:

• Inside your composable function, declare the following variables:
• scope: A coroutine scope used for efficiently expanding or hiding the bottom sheet.
• isBottomSheetVisible: A mutable state to control the visibility of the bottom sheet.
• sheetState: A ModalBottomSheetState object to manage the state of the bottom sheet.

2. Initialize Bottom Sheet Variables:

• Set the initial value of isBottomSheetVisible to false.
• Create an instance of rememberModalBottomSheetState() and assign it to sheetState.

3. Create the Bottom Sheet Composable:

• Surround the custom bottom sheet UI with an if (isBottomSheetVisible) {} block.
• Customize the properties of the ModalBottomSheet composable:
  • Set onDismissRequest to onDismiss.
  • Set sheetState to sheetState.
  • Set containerColor to Color.Transparent.
  • Set contentColor to a color of your choice for the content.
  • Set shape to RectangleShape.
  • Set dragHandle to null to remove the default drag handle.
  • Set scrimColor to the desired scrim (background) color.
  • Optionally set windowInsets to WindowInsets(0, 0, 0, 0) if you want the bottom sheet to expand under the system bars.

4. Implement the Custom Layout for the Bottom Sheet:

• Inside the content block of the ModalBottomSheet, implement the desired UI layout for your bottom sheet.
• For example, you can use a Column to vertically align the elements within the bottom sheet.
• Add components like TextField, Button, and OutlinedButton to create the custom UI.

5. Implement the Button to Show the Bottom Sheet:

• Wherever you want to display the button that opens the bottom sheet, add a button composable.
• When the button is clicked, launch a coroutine using scope to set isBottomSheetVisible to true and expand the bottom sheet using sheetState.expand().

6. Implement the Dismiss Function:

• Define an onDismiss function that hides the bottom sheet when called.
• In the ModalBottomSheet composable, pass onDismiss to the onDismissRequest parameter.
• When the bottom sheet is dismissed, set isBottomSheetVisible to false to hide it.

7. Use the Custom Modal Bottom Sheet:

• Place the BottomSheet composable wherever you want to use it in your layout.
• Call the button composable that opens the bottom sheet when needed.
• The custom bottom sheet will appear when the button is clicked.

This custom bottom sheet can be used to create various types of bottom sheets with different UI designs and functionalities. You can modify the layout and content according to your specific requirements.

Video Explanation: