In cars, the number and usage scenarios of audio devices are very different from those on mobile phones. The original audio service of Android cannot meet the needs of use in the car. Therefore, Android Automotive OS expands Android's original audio mechanism. Added CarAudioService to CarService. Conduct more detailed management of audio equipment to meet the usage scenarios in the car.
1. Introduction
CarAudioService is an important component in Android Automotive OS and is used to manage audio functions in the vehicle. It's the part of Android Auto that handles playback, control, and routing of vehicle audio.
CarAudioService uses the standard Android component architecture and provides a set of APIs for managing vehicle audio based on the Binder communication mechanism. It includes the following main features:
Audio routing management: CarAudioService allows developers to control audio routing, that is, sending audio to different output devices, such as vehicle speakers, headphones, etc. It supports switching audio routing as needed to meet the vehicle's requirements.
Media playback control: CarAudioService allows developers to control the playback and pause of vehicle audio. Developers can send commands such as play, pause, next song, and previous song to perform related operations of the media player.
Audio focus management: CarAudioService supports audio focus management, which controls which application can use the vehicle audio system first. It provides a set of APIs for applying for, releasing, and monitoring audio focus changes.
Audio effect management: CarAudioService allows developers to manage vehicle audio effects, such as equalizers, gainers, etc. Developers can adjust the parameters of the audio effector to change the audio quality, volume and other characteristics.