react-native-track-player/src/hooks/useAppIsInBackground.ts

A fully fledged audio module created for music apps

import { useState, useEffect } from 'react';
import { AppState, AppStateStatus } from 'react-native';

export function useAppIsInBackground() {
  const [state, setState] = useState<AppStateStatus>('active');

  useEffect(() => {
    const onStateChange = (nextState: AppStateStatus) => {
      setState(nextState);
    };

    AppState.addEventListener('change', onStateChange);

    return () => {
      AppState.removeEventListener('change', onStateChange);
    };
  }, []);
  return state === 'background';
}