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認証イベントのリスン

Amplify Auth は認証フロー中にイベントを発行します。これにより、ユーザーフローをリアルタイムで監視し、カスタムビジネスロジックをトリガーできます。たとえば、データをキャプチャし、アプリの状態を同期し、ユーザーエクスペリエンスをパーソナライズしたい場合があります。サインインやサインアウトなど、Auth ライフサイクル全体のイベントをリスンして対応できます。

AWS Cognito Auth プラグインは、Amplify Hub を通じて重要なイベントを送信します。次のようにこれらのイベントをリスニングできます:

Amplify.Hub.subscribe(HubChannel.AUTH,
    hubEvent -> {
        if (hubEvent.getName().equals(InitializationStatus.SUCCEEDED.name())) {
            Log.i("AuthQuickstart", "Auth successfully initialized");
        } else if (hubEvent.getName().equals(InitializationStatus.FAILED.name())){
            Log.i("AuthQuickstart", "Auth failed to succeed");
        } else {
            String eventName = hubEvent.getName();
            if (eventName.equals(SIGNED_IN.name())) {
                Log.i("AuthQuickstart", "Auth just became signed in.");
            else if (eventName.equals(SIGNED_OUT.name())) {
                Log.i("AuthQuickstart", "Auth just became signed out.");
            else if (eventName.equals(SESSION_EXPIRED.name())) {
                Log.i("AuthQuickstart", "Auth session just expired.");
            else if (eventName.equals(USER_DELETED.name())) {
                Log.i("AuthQuickstart", "User has been deleted.");
            else {
                Log.w("AuthQuickstart", "Unhandled Auth Event: " + eventName);

Amplify.Hub.subscribe(HubChannel.AUTH) { event ->
    when (event.name) {
        InitializationStatus.SUCCEEDED.name ->
            Log.i("AuthQuickstart", "Auth successfully initialized")
        InitializationStatus.FAILED.name ->
            Log.i("AuthQuickstart", "Auth failed to succeed")
        else -> when (event.name) {
            AuthChannelEventName.SIGNED_IN.name ->
                Log.i("AuthQuickstart", "Auth just became signed in")
            AuthChannelEventName.SIGNED_OUT.name ->
                Log.i("AuthQuickstart", "Auth just became signed out")
            AuthChannelEventName.SESSION_EXPIRED.name ->
                Log.i("AuthQuickstart", "Auth session just expired")
            AuthChannelEventName.USER_DELETED.name ->
                Log.i("AuthQuickstart", "User has been deleted")
            else ->
                Log.w("AuthQuickstart", "Unhandled Auth Event: ${event.name}")

Amplify.Hub.subscribe(HubChannel.AUTH).collect {
    when (it.name) {
        InitializationStatus.SUCCEEDED.name ->
            Log.i("AuthQuickstart", "Auth successfully initialized")
        InitializationStatus.FAILED.name ->
            Log.i("AuthQuickstart", "Auth failed to succeed")
        else -> when (it.name) {
            AuthChannelEventName.SIGNED_IN.name ->
                Log.i("AuthQuickstart", "Auth just became signed in.")
            AuthChannelEventName.SIGNED_OUT.name ->
                Log.i("AuthQuickstart", "Auth just became signed out.")
            AuthChannelEventName.SESSION_EXPIRED.name ->
                Log.i("AuthQuickstart", "Auth session just expired.")
            AuthChannelEventName.USER_DELETED.name ->
                Log.i("AuthQuickstart", "User has been deleted.")
            else ->
                Log.w("AuthQuickstart", "Unhandled Auth Event: ${it.name}")

RxAmplify.Hub.on(HubChannel.AUTH)
    .map(HubEvent::getName)
    .subscribe(name -> {
        if (name.equals(InitializationStatus.SUCCEEDED.name())) {
            Log.i("AuthQuickstart", "Auth successfully initialized");
            return;
        } else if (name.equals(InitializationStatus.FAILED.name())) {
            Log.i("AuthQuickstart", "Auth failed to succeed");
            return;
        } else {
            if (name.equals(SIGNED_IN.name())) {
                Log.i("AuthQuickstart", "Auth just became signed in.");
            else if (name.equals(SIGNED_OUT.name())) {
                Log.i("AuthQuickstart", "Auth just became signed out.");
            else if (name.equals(SESSION_EXPIRED.name())) {
                Log.i("AuthQuickstart", "Auth session just expired.");
            else if (name.equals(USER_DELETED.name())) {
                Log.i("AuthQuickstart", "User has been deleted.");
            else {
                Log.w("AuthQuickstart", "Unhandled Auth Event: " + hubEvent.getName());