MainComponent.jsx

import React, { Component } from 'react'
import { DeviceEventEmitter } from 'react-native'

class MainComponent extends Component {

    componentDidMount() {
      DeviceEventEmitter.addListener('accept', () => {
        //Do something!
      })
         DeviceEventEmitter.addListener('reject', () => {
        //Do something!
      })
    }
}