Support in-app updates

InitAppUpdateFlow.kt

private fun initAppUpdateFlow() {
    logcat { "check app update" }
    val appUpdateManager = AppUpdateManagerFactory.create(this)
    lifecycleScope.launch {
        try {
            appUpdateManager.requestUpdateFlow().collect(::onAppUpdateResult)
        } catch (e: InstallException) {
            logcat(LogPriority.ERROR) { "Failed to request app update flow\n${e.asLog()}" }
        }
    }
}

private fun onAppUpdateResult(result: AppUpdateResult) {
    when (result) {
        AppUpdateResult.NotAvailable -> onAppUpdateNotAvailable()
        is AppUpdateResult.Available -> onAppUpdateAvailable(result)
        is AppUpdateResult.InProgress -> onAppUpdateInProgress(result)
        is AppUpdateResult.Downloaded -> onAppUpdateDownloaded(result)
    }
}

private fun onAppUpdateNotAvailable() {
    logcat { "App update not available" }
}

private fun onAppUpdateAvailable(result: AppUpdateResult.Available) {
    logcat { "App update available ${result.updateInfo.availableVersionCode()}" }
    val availableVersionCode = result.updateInfo.availableVersionCode()
    val currentVersionCode = BuildConfig.VERSION_CODE
    val isMajorUpdate = availableVersionCode - currentVersionCode >= 1000000
    if (isMajorUpdate && result.updateInfo.isImmediateUpdateAllowed) {
        result.startImmediateUpdate(this, REQUEST_CODE_APP_UPDATE_IMMEDIATE)
        return
    }
    val isMinorUpdate = availableVersionCode - currentVersionCode >= 10000
    if (isMinorUpdate && result.updateInfo.isFlexibleUpdateAllowed) {
        result.startFlexibleUpdate(this, REQUEST_CODE_APP_UPDATE_FLEXIBLE)
        return
    }
    logcat { "Skip app update $availableVersionCode" }
}

private fun onAppUpdateInProgress(result: AppUpdateResult.InProgress) {
    val progress = result.installState.run { bytesDownloaded() * 100 / totalBytesToDownload() }
    logcat { "App update in progress $progress" }
}

private fun onAppUpdateDownloaded(result: AppUpdateResult.Downloaded) {
    logcat { "App update downloaded" }
    Snackbar.make(
        findViewById(android.R.id.content),
        R.string.app_update_downloaded,
        Snackbar.LENGTH_INDEFINITE
    ).apply {
        setAction(R.string.app_update_complete_update) {
            lifecycleScope.launch { result.completeUpdate() }
        }
    }.show()
}