ClassA.kt

class ClassA {

    var objectA = null

    init {
        objectA = getAFromFrameworkApi()
    }
    fun registerListenerAChange() {
        objectA.registerStateChange()
    }
    fun unRegisterListenerAChange() {
        objectA.unregister()
    }
    fun releaseAll() {
        objectA.release()
        objectA = null
    }