What is audio focus in Android class AudioManager?
AudioManager class has a method
abandonAudioFocus() and another method
requestAudioFocus(). I wonder what is audio focus? And what happens if an
AudioManager object gets the audio focus or lost the audio focus?
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It has to do with priority when using the speakers, to prevent playing many things at once or being overridden. If you
requestAudioFocus(), you’re declaring that you want control. You can then listen with
onAudioFocusChange(int focusChange) to see if anything else tries to play a sound. You may forcefully lose focus (like during a phone call) but then you can gain it later. You should
abandonAudioFocus() when you’re finished.
You use audio focus when setting which app has the playback priority. For example, you can set up what should your app do when it’s playing a audio file and some other app wants to take the focus and play something. If you do not set up what will happen it these cases, the other app will just play audio over yours.
I’ve written a blog post about this: http://markojerkic.com/handling-audio-focus-in-android/