Scroll to given position in Android Leanback ListRow

Scroll to Given Position in Android Leanback ListRow

Introduction

Android Leanback provides a robust framework for building TV-optimized user interfaces. In this article, we will delve into the method of scrolling a ListRow to a specific position.

Understanding ListRow

• ListRow serves as a container for multiple rows of data in Leanback.
• Each row is typically represented by a Presenter, which defines its layout and behavior.
• Scroll functionality allows the user to navigate through the list.

Methods for Scrolling

1. Using a RowPresenter

• RowPresenter provides a scrollToPosition method to directly scroll to a given index.

“`java

RowPresenter rowPresenter = new RowPresenter();
rowPresenter.scrollToPosition(listRow, position);

“`

2. Utilizing a VerticalGridView

• VerticalGridView, a commonly used view within Leanback, also offers scrolling capabilities.
• You can use the smoothScrollToPosition method to smoothly scroll to a desired index.

“`java

VerticalGridView gridView = ...; // Initialize your VerticalGridView
gridView.smoothScrollToPosition(position);

“`

Comparison Table

| Method | Description | Applicability |
|—|—|—|
| RowPresenter.scrollToPosition | Directly scrolls to a position within a specific ListRow | Suitable for scrolling within a single row |
| VerticalGridView.smoothScrollToPosition | Smoothly scrolls to a position within the entire VerticalGridView | Ideal for scrolling across multiple rows |

Example Implementation

“`java

// Create a ListRow with some data
List