Applicable XR devices This guidance helps you build experiences for these types of XR devices. [Learn about XR device types →](https://developer.android.com/develop/xr/devices)  Audio \& Display Glasses [](https://developer.android.com/develop/xr/devices#audio-display) [Learn about XR device types →](https://developer.android.com/develop/xr/devices)
Users interact with audio glasses and display glasses in different ways, such as the following: - Asking a question using their voice. - Gesturing on the touchpad (for example, tapping or swiping back, forward, up, and down) - Pressing a button on the side of their device. Android XR has built-in support for some of these use cases, while others require you to customize or extend the system's default behavior or implement certain APIs. Regardless of whether a user has audio glasses or display glasses, their voice is their primary way to interact with their device. This guide covers the following topics: - How the system [routes physical input on audio glasses](https://developer.android.com/develop/xr/jetpack-xr-sdk/glasses/input-routing-audio). - How to [handle physical input](https://developer.android.com/develop/xr/jetpack-xr-sdk/glasses/physical-input). - How to [handle audio input using automatic speech recognition](https://developer.android.com/develop/xr/jetpack-xr-sdk/asr). This guide assumes you're familiar with the following concepts: - [Requesting hardware permissions](https://developer.android.com/develop/xr/jetpack-xr-sdk/request-hardware-permissions) - [Android activities](https://developer.android.com/guide/components/activities/intro-activities) - [The activity lifecycle](https://developer.android.com/guide/components/activities/activity-lifecycle) - [Activity state changes](https://developer.android.com/guide/components/activities/state-changes)