LoginActivity.kt

class LoginActivity : BaseActivity() {
  public override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        setContentView(R.layout.activity_login)
        ButterKnife.bind(this)


        checkForAppUpdate() 
}

override fun onResume() {
        super.onResume()
        mAppUpdateManager = AppUpdateManagerFactory.create(this)
        mAppUpdateManager.appUpdateInfo
                .addOnSuccessListener { appUpdateInfo ->
                    // If the update is downloaded but not installed,
                    // notify the user to complete the update.
                    if (appUpdateInfo.installStatus() == InstallStatus.DOWNLOADED) {
                        popupSnackBarForCompleteStatus()
                    }

                    if (appUpdateInfo.updateAvailability() == UpdateAvailability.DEVELOPER_TRIGGERED_UPDATE_IN_PROGRESS) {
                        // If an in-app update is already running, resume the update.
                        try {
                            mAppUpdateManager.startUpdateFlowForResult(
                                    appUpdateInfo,
                                    AppUpdateType.IMMEDIATE,
                                    this,
                                    APP_UPDATE_REQ_CODE
                            )
                        } catch (e: Exception) {
                            Utils.sendCustomCrashlyticsLog(e, null)
                        }
                    }
                }
    }
  private fun checkForAppUpdate() {
        // Returns an intent object that you use to check for an update.
        mAppUpdateManager = AppUpdateManagerFactory.create(this)
        val appUpdateInfoTask = mAppUpdateManager.appUpdateInfo
        // Checks that the platform will allow the specified type of update.
        appUpdateInfoTask.addOnSuccessListener { appUpdateInfo ->
            if (appUpdateInfo.updateAvailability() == UpdateAvailability.UPDATE_AVAILABLE
                    && appUpdateInfo.isUpdateTypeAllowed(AppUpdateType.IMMEDIATE)) {
                // Request the update.
                Utils.logMessage("Update", "Available")
                mAppUpdateManager.startUpdateFlowForResult(
                        appUpdateInfo,
                        AppUpdateType.IMMEDIATE,
                        this,
                        APP_UPDATE_REQ_CODE
                )
            }
        }
    }
  
  private fun popupSnackBarForCompleteStatus() {
        val snackBar = Snackbar.make(
                findViewById(R.id.container),
                "An update has just been downloaded.",
                Snackbar.LENGTH_INDEFINITE)
        snackBar.setAction("RESTART") { mAppUpdateManager.completeUpdate() }
        snackBar.setActionTextColor(ContextCompat.getColor(this, R.color.blue_button_bg))
        snackBar.show()
    }

    companion object {
        private const val APP_UPDATE_REQ_CODE = 345
    }
}