Fix BiometricPrompt double TalkBack announcement

Fixes an issue that caused the content description for the
BiometricPrompt background cancellation target to be read aloud twice by
TalkBack when the prompt was displayed.

Test: Manual:
1. Enable Talkback
2. Install the CtsVerifier apk
3. Launch app and select Biometric Tests > 4a: Cipher, Credential
4. Select "time-based key with biometric" to launch prompt

Before: TalkBack reads "Tap to cancel authentication. Tap to cancel
authentication, button."

After: TalkBack reads "SystemUI. Tap to cancel authentication, button."

Fixes: 155042588
Change-Id: I93f7380d87213aba8f1e1030510b84170ae9c2f7

2 files changed, 1 insertions, 1 deletions

diff --git a/packages/SystemUI/res/layout/auth_container_view.xml b/packages/SystemUI/res/layout/auth_container_view.xml
index 63eccda5d309..3db01a4e7f3a 100644
--- a/packages/SystemUI/res/layout/auth_container_view.xml
+++ b/packages/SystemUI/res/layout/auth_container_view.xml
@@ -23,7 +23,6 @@
         android:id="@+id/background"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
-        android:accessibilityLiveRegion="polite"
         android:background="@color/biometric_dialog_dim_color"
         android:contentDescription="@string/biometric_dialog_empty_space_description"/>
 
diff --git a/packages/SystemUI/src/com/android/systemui/biometrics/AuthContainerView.java b/packages/SystemUI/src/com/android/systemui/biometrics/AuthContainerView.java
index b736b4df8abf..b0051d00e0b5 100644
--- a/packages/SystemUI/src/com/android/systemui/biometrics/AuthContainerView.java
+++ b/packages/SystemUI/src/com/android/systemui/biometrics/AuthContainerView.java
@@ -300,6 +300,7 @@ public class AuthContainerView extends LinearLayout
             return true;
         });
 
+        setImportantForAccessibility(IMPORTANT_FOR_ACCESSIBILITY_NO);
         setFocusableInTouchMode(true);
         requestFocus();
     }