MainActivity: Provide a way to access the applicationContext via MainActivity

    private var isReceiverRegistered = false

    var accentColorOS = 0

    init {

        instance = this

    }

    companion object {

        private var instance: MainActivity? = null

        lateinit var mActivity: MainActivity

        var sharedPreferences : SharedPreferences?=null

        val sharedPrefFile = "kotlinsharedpreference"

        /*

         * Provides the application context via MainActivity

         * @return applicationContext

         */

        fun applicationContext(): Context {

            return instance!!.applicationContext

        }

    }