Android In App Review

Jan 28 2021 · Kotlin 1.4, Android 5, Android Studio 4

Part 1: Implementing In App Review

06. Implement The In App Review Manager

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Previous episode: 05. Provide Dependencies Next episode: 07. Connect The Manager To UI

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Now that you have nearly everything in place in terms of dependencies, project setup and data, it’s time to build the InAppReviewManager. To start doing that, create a new interface named InAppReviewManager:

interface InAppReviewManager {

  fun startReview(activity: Activity)

  fun isEligibleForReview(): Boolean
class InAppReviewManagerImpl @Inject constructor(
  @ApplicationContext private val context: Context,
  private val reviewManager: ReviewManager,
  private val inAppReviewPreferences: InAppReviewPreferences
) : InAppReviewManager {

abstract fun bindInAppReviewManager(
  inAppReviewManagerImpl: InAppReviewManagerImpl
): InAppReviewManager
  companion object {
    private const val KEY_REVIEW = "reviewFlow"

  private var reviewInfo: ReviewInfo? = null

  init {
    if (isEligibleForReview()) {
      reviewManager.requestReviewFlow().addOnCompleteListener {
        if (it.isComplete && it.isSuccessful) {
          this.reviewInfo = it.result
override fun isEligibleForReview(): Boolean {
  return (!inAppReviewPreferences.hasUserRatedApp()
    && !inAppReviewPreferences.hasUserChosenRateLater())
    || (inAppReviewPreferences.hasUserChosenRateLater() && enoughTimePassed())

private fun enoughTimePassed(): Boolean {
  val rateLaterTimestamp = inAppReviewPreferences.getRateLaterTime()

  return abs(rateLaterTimestamp - System.currentTimeMillis()) >= TimeUnit.DAYS.toMillis(14)
override fun startReview(activity: Activity) {
  if (reviewInfo != null) {
    reviewManager.launchReviewFlow(activity, reviewInfo).addOnCompleteListener { reviewFlow ->

private fun onReviewFlowLaunchCompleted(reviewFlow: Task<Void>) {
  if (reviewFlow.isSuccessful) {

private fun logSuccess() {
  if (BuildConfig.DEBUG) {
    Log.d(KEY_REVIEW, "Review complete!")