Expo AV

Expo AV is a module provided by Expo for handling audio and video in React Native applications. It allows developers to add media playing capabilities to their apps with relative ease.

Features

Expo AV comes packed with a range of features such as:

• Playback of audio and video files
• Recording audio and video
• Audio recording with adjustable settings like bitrate, channels and sample rate
• Video recording with adjustable settings like quality, aspect ratio and codec
• Playback and recording at different speeds
• Mixing multiple audio tracks into one
• ReplayKit for screen recording on iOS devices
• And more!

Getting started

To get started with Expo AV, you first need to install it by running the following command in your React Native project:

expo install expo-av

After installing Expo AV, you need to import it in your code to use it. You can do this using the following line of code:

import { Audio } from 'expo-av';

Basic Usage

Here's an example of how you can use Expo AV to play an audio file:

import React from 'react';
import { Audio } from 'expo-av';

function AudioPlayer() {
  const [sound, setSound] = React.useState(null);

  async function loadAudio() {
    const { sound } = await Audio.Sound.createAsync(
      { uri: 'http://example.com/my-file.mp3' },
      { shouldPlay: true }
    );
    setSound(sound);
  }

  React.useEffect(() => {
    loadAudio();
    return sound ? () => sound.unloadAsync() : undefined;
  }, []);

  return (
    <div>
      {sound ? <div>Playing audio</div> : null}
    </div>
  );
}

In this code, we first import the Audio module from Expo AV. Then we define a component AudioPlayer that loads an audio file from a URL and plays it automatically by setting the shouldPlay property to true. We use the useState hook to keep track of the loaded sound and the useEffect hook to load the audio file when the component mounts and unload it when it unmounts.

Conclusion

Expo AV is a powerful tool for adding media playing capabilities to your React Native apps. With its feature-rich API and easy-to-use functions, it makes handling audio and video an absolute breeze. Start using Expo AV today and take your app to the next level!