如何在android中测试应用内更新API?

这是我的代码:

fun checkForUpdates(){

    val appUpdateManager = AppUpdateManagerFactory.create(this)
    val appUpdateInfoTask = appUpdateManager.appUpdateInfo


    val listener = InstallStateUpdatedListener {

        if (it.installStatus() == InstallStatus.DOWNLOADED){

            val snackBar = Snackbar.make(parentLayout, "An update has just been downloaded.", Snackbar.LENGTH_INDEFINITE)
            snackBar.duration = 10000
            snackBar.view.setBackgroundColor(ContextCompat.getColor(this, R.color.colorPrimaryDark))
            snackBar.setActionTextColor(ContextCompat.getColor(this, R.color.white))
            snackBar.setAction("RESTART") {
                appUpdateManager.completeUpdate()
            }
            snackBar.show()
        }
    }


    appUpdateInfoTask.addOnSuccessListener { appUpdateInfo->
        if (appUpdateInfo.updateAvailability() == UpdateAvailability.UPDATE_AVAILABLE && appUpdateInfo.isUpdateTypeAllowed(AppUpdateType.FLEXIBLE)){
            appUpdateManager.registerListener(listener)
            appUpdateManager.startUpdateFlowForResult(
                appUpdateInfo,
                AppUpdateType.IMMEDIATE,
                this,
                UPDATE_REQUEST_CODE)

        }
    }
}

我在测试它时遇到了问题。我试图减少我的版本号,但似乎不起作用。