Added typing activity to activityhandler (#837)

Author: LeeParrishMSFT

libraries/bot-builder/src/main/java/com/microsoft/bot/builder/ActivityHandler.java

@@ -80,6 +80,9 @@ public CompletableFuture<Void> onTurn(TurnContext turnContext) {
             case ActivityTypes.INSTALLATION_UPDATE:
                 return onInstallationUpdate(turnContext);
 
+            case ActivityTypes.TYPING:
+                return onTypingActivity(turnContext);
+
             case ActivityTypes.INVOKE:
                 return onInvokeActivity(turnContext).thenCompose(invokeResponse -> {
                     // If OnInvokeActivityAsync has already sent an InvokeResponse, do not send
@@ -501,6 +504,17 @@ protected CompletableFuture<Void> onInstallationUpdate(TurnContext turnContext)
         return CompletableFuture.completedFuture(null);
     }
 
+    /**
+     * Override this in a derived class to provide logic specific to
+     * ActivityTypes.Typing activities.
+     *
+     * @param turnContext The context object for this turn.
+     * @return A task that represents the work queued to execute.
+     */
+    protected CompletableFuture<Void> onTypingActivity(TurnContext turnContext) {
+        return CompletableFuture.completedFuture(null);
+    }
+
     /**
      * Invoked when an activity other than a message, conversation update, or event
      * is received when the base behavior of {@link #onTurn(TurnContext)} is used.

libraries/bot-builder/src/test/java/com/microsoft/bot/builder/ActivityHandlerTests.java

@@ -33,6 +33,18 @@ public void TestOnInstallationUpdate() {
         Assert.assertEquals("onInstallationUpdate", bot.getRecord().get(0));
     }
 
+    @Test
+    public void TestOnTypingActivity() {
+        Activity activity = new Activity(ActivityTypes.TYPING);
+        TurnContext turnContext = new TurnContextImpl(new NotImplementedAdapter(), activity);
+
+        TestActivityHandler bot = new TestActivityHandler();
+        bot.onTurn(turnContext).join();
+
+        Assert.assertEquals(1, bot.getRecord().size());
+        Assert.assertEquals("onTypingActivity", bot.getRecord().get(0));
+    }
+
     @Test
     public void TestMemberAdded1() {
         Activity activity = new Activity() {
@@ -449,6 +461,12 @@ protected CompletableFuture onInstallationUpdate(TurnContext turnContext) {
             return super.onInstallationUpdate(turnContext);
         }
 
+        @Override
+        protected CompletableFuture onTypingActivity(TurnContext turnContext) {
+            record.add("onTypingActivity");
+            return super.onTypingActivity(turnContext);
+        }
+
         @Override
         protected CompletableFuture onUnrecognizedActivityType(TurnContext turnContext) {
             record.add("onUnrecognizedActivityType");