Add talkback when FingerprintDialog is authenticated

Fixes: 74456537

Test: manual test with cts-verifier and talkback enabled
Change-Id: Ia12edfa38abcde1a96674b552a5e65aaeda1feeb
diff --git a/packages/SystemUI/src/com/android/systemui/fingerprint/FingerprintDialogImpl.java b/packages/SystemUI/src/com/android/systemui/fingerprint/FingerprintDialogImpl.java
index 4b15fbc..f2eea26 100644
--- a/packages/SystemUI/src/com/android/systemui/fingerprint/FingerprintDialogImpl.java
+++ b/packages/SystemUI/src/com/android/systemui/fingerprint/FingerprintDialogImpl.java
@@ -147,6 +147,9 @@
 
     private void handleFingerprintAuthenticated() {
         if (DEBUG) Log.d(TAG, "handleFingerprintAuthenticated");
+        mDialogView.announceForAccessibility(
+                mContext.getResources().getText(
+                        com.android.internal.R.string.fingerprint_authenticated));
         handleHideDialog(false /* userCanceled */);
     }