Don't listen for udfps on lock down or encryption

If the device is encryped or is in lock down, don't show the udfps
overlay because the user cannot authenticate from this state anyway.

Test: atest KeyguardUpdateMonitorTest
Fixes: 183629563
Change-Id: Ie48dfa6bc4a5db0a35be02fd973d982ef3475315

packages/SystemUI/src/com/android/keyguard/KeyguardUpdateMonitor.java

@@ -2113,6 +2113,7 @@ public class KeyguardUpdateMonitor implements TrustManager.TrustListener, Dumpab
         return shouldListenForFingerprint()
                 && !mBouncer
                 && !getUserCanSkipBouncer(getCurrentUser())
+                && !isEncryptedOrLockdown(getCurrentUser())
                 && mStrongAuthTracker.hasUserAuthenticatedSinceBoot();
     }
 

packages/SystemUI/tests/src/com/android/keyguard/KeyguardUpdateMonitorTest.java

@@ -910,6 +910,21 @@ public class KeyguardUpdateMonitorTest extends SysuiTestCase {
         assertThat(mKeyguardUpdateMonitor.shouldListenForUdfps()).isEqualTo(false);
     }
 
+    @Test
+    public void testShouldNotListenForUdfps_whenInLockDown() {
+        // GIVEN a "we should listen for udfps" state
+        setKeyguardBouncerVisibility(false /* isVisible */);
+        mStatusBarStateListener.onStateChanged(StatusBarState.KEYGUARD);
+        when(mStrongAuthTracker.hasUserAuthenticatedSinceBoot()).thenReturn(true);
+
+        // WHEN device in lock down
+        when(mStrongAuthTracker.getStrongAuthForUser(anyInt())).thenReturn(
+                KeyguardUpdateMonitor.StrongAuthTracker.STRONG_AUTH_REQUIRED_AFTER_USER_LOCKDOWN);
+
+        // THEN we shouldn't listen for udfps
+        assertThat(mKeyguardUpdateMonitor.shouldListenForUdfps()).isEqualTo(false);
+    }
+
     @Test
     public void testRequireUnlockForNfc_Broadcast() {
         KeyguardUpdateMonitorCallback callback = mock(KeyguardUpdateMonitorCallback.class);