diff --git a/packages/SystemUI/res-keyguard/drawable-mdpi/ic_lockscreen_sim.png b/packages/SystemUI/res-keyguard/drawable-mdpi/ic_lockscreen_sim.png
deleted file mode 100644
index 2e259c3e17c17..0000000000000
Binary files a/packages/SystemUI/res-keyguard/drawable-mdpi/ic_lockscreen_sim.png and /dev/null differ
diff --git a/packages/SystemUI/res-keyguard/drawable-xhdpi/ic_lockscreen_sim.png b/packages/SystemUI/res-keyguard/drawable-xhdpi/ic_lockscreen_sim.png
deleted file mode 100644
index f4de96adae303..0000000000000
Binary files a/packages/SystemUI/res-keyguard/drawable-xhdpi/ic_lockscreen_sim.png and /dev/null differ
diff --git a/packages/SystemUI/res-keyguard/drawable-hdpi/ic_lockscreen_sim.png b/packages/SystemUI/res-keyguard/drawable/ic_lockscreen_sim.png
similarity index 100%
rename from packages/SystemUI/res-keyguard/drawable-hdpi/ic_lockscreen_sim.png
rename to packages/SystemUI/res-keyguard/drawable/ic_lockscreen_sim.png
diff --git a/packages/SystemUI/res-keyguard/layout/keyguard_num_pad_key.xml b/packages/SystemUI/res-keyguard/layout/keyguard_num_pad_key.xml
index 411fea5dd22de..48769fdebd990 100644
--- a/packages/SystemUI/res-keyguard/layout/keyguard_num_pad_key.xml
+++ b/packages/SystemUI/res-keyguard/layout/keyguard_num_pad_key.xml
@@ -14,10 +14,12 @@
   ~ limitations under the License
   -->
 
-<merge xmlns:android="http://schemas.android.com/apk/res/android">
+<merge xmlns:android="http://schemas.android.com/apk/res/android" >
     <TextView
         android:id="@+id/digit_text"
         style="@style/Widget.TextView.NumPadKey.Digit"
+        android:autoSizeMaxTextSize="32sp"
+        android:autoSizeTextType="uniform"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         />
diff --git a/packages/SystemUI/res-keyguard/layout/keyguard_sim_pin_view.xml b/packages/SystemUI/res-keyguard/layout/keyguard_sim_pin_view.xml
index 7db0fe908ec05..728d861ab6939 100644
--- a/packages/SystemUI/res-keyguard/layout/keyguard_sim_pin_view.xml
+++ b/packages/SystemUI/res-keyguard/layout/keyguard_sim_pin_view.xml
@@ -1,5 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!--
+<?xml version="1.0" encoding="utf-8"?><!--
 **
 ** Copyright 2012, The Android Open Source Project
 **
@@ -17,185 +16,185 @@
 */
 -->
 <!-- This is the SIM PIN view that allows the user to enter a SIM PIN to unlock the device. -->
-<com.android.keyguard.KeyguardSimPinView
-        xmlns:android="http://schemas.android.com/apk/res/android"
-        xmlns:androidprv="http://schemas.android.com/apk/res-auto"
-        android:id="@+id/keyguard_sim_pin_view"
-        android:orientation="vertical"
+<com.android.keyguard.KeyguardSimPinView xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:androidprv="http://schemas.android.com/apk/res-auto"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:id="@+id/keyguard_sim_pin_view"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical"
+    androidprv:layout_maxWidth="@dimen/keyguard_security_width"
+    android:layout_gravity="center_horizontal|bottom">
+    <include layout="@layout/keyguard_bouncer_message_area"/>
+
+    <androidx.constraintlayout.widget.ConstraintLayout
         android:layout_width="match_parent"
-        android:layout_height="match_parent"
-        androidprv:layout_maxWidth="@dimen/keyguard_security_width"
-        android:layout_gravity="center_horizontal|bottom">
-    <include layout="@layout/keyguard_bouncer_message_area" />
-    <Space
-          android:layout_width="match_parent"
-          android:layout_height="0dp"
-          android:layout_weight="1" />
-    <ImageView
-            android:id="@+id/keyguard_sim"
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:tint="@color/background_protected"
-            android:src="@drawable/ic_lockscreen_sim"/>
-    <LinearLayout
+        android:layout_height="0dp"
+        android:layout_weight="1"
+        android:layoutDirection="ltr">
+        <LinearLayout
+            android:id="@+id/pin_area"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:orientation="vertical"
-            android:gravity="center"
-            android:layoutDirection="ltr"
-            >
-        <include layout="@layout/keyguard_esim_area"
-             android:id="@+id/keyguard_esim_area"
-             android:layout_width="wrap_content"
-             android:layout_height="wrap_content" />
-        <RelativeLayout
-                android:id="@+id/row0"
-                android:layout_width="match_parent"
-                android:layout_height="wrap_content"
-                android:paddingBottom="4dp"
-                >
+            android:gravity="center_horizontal"
+            android:paddingTop="@dimen/num_pad_entry_row_margin_bottom"
+            android:paddingBottom="@dimen/num_pad_entry_row_margin_bottom"
+            androidprv:layout_constraintBottom_toTopOf="@+id/flow1"
+            androidprv:layout_constraintEnd_toEndOf="parent"
+            androidprv:layout_constraintStart_toStartOf="parent"
+            androidprv:layout_constraintTop_toTopOf="parent">
+
+            <ImageView
+                android:id="@+id/keyguard_sim"
+                android:layout_width="40dp"
+                android:layout_height="40dp"
+                android:layout_gravity="center_horizontal"
+                android:src="@drawable/ic_lockscreen_sim"
+                app:tint="@color/background_protected" />
+
+            <include
+                android:id="@+id/keyguard_esim_area"
+                layout="@layout/keyguard_esim_area"
+                android:layout_gravity="center_horizontal"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content" />
+
             <com.android.keyguard.PasswordTextView
                 android:id="@+id/simPinEntry"
                 style="@style/Widget.TextView.Password"
                 android:layout_width="@dimen/keyguard_security_width"
                 android:layout_height="@dimen/keyguard_password_height"
-                android:layout_centerHorizontal="true"
-                android:layout_marginRight="72dp"
                 android:contentDescription="@string/keyguard_accessibility_sim_pin_area"
-                android:gravity="center"
+                android:layout_gravity="center_horizontal"
                 androidprv:scaledTextSize="@integer/scaled_password_text_size" />
-        </RelativeLayout>
-        <LinearLayout
-                android:layout_width="wrap_content"
-                android:layout_height="wrap_content"
-                android:orientation="horizontal"
-                android:layout_gravity="center_horizontal"
-                android:layout_marginBottom="@dimen/num_pad_row_margin_bottom"
-                >
-            <com.android.keyguard.NumPadKey
-                    android:id="@+id/key1"
-                    android:layout_width="@dimen/num_pad_key_width"
-                    android:layout_height="match_parent"
-                    android:layout_marginEnd="@dimen/num_pad_key_margin_end"
-                    androidprv:textView="@+id/simPinEntry"
-                    androidprv:digit="1"
-                    />
-            <com.android.keyguard.NumPadKey
-                    android:id="@+id/key2"
-                    android:layout_width="@dimen/num_pad_key_width"
-                    android:layout_height="match_parent"
-                    android:layout_marginEnd="@dimen/num_pad_key_margin_end"
-                    androidprv:textView="@+id/simPinEntry"
-                    androidprv:digit="2"
-                    />
-            <com.android.keyguard.NumPadKey
-                    android:id="@+id/key3"
-                    android:layout_width="@dimen/num_pad_key_width"
-                    android:layout_height="match_parent"
-                    androidprv:textView="@+id/simPinEntry"
-                    androidprv:digit="3"
-                    />
         </LinearLayout>
-        <LinearLayout
-                android:layout_width="wrap_content"
-                android:layout_height="wrap_content"
-                android:orientation="horizontal"
-                android:layout_gravity="center_horizontal"
-                android:layout_marginBottom="@dimen/num_pad_row_margin_bottom"
-                >
-            <com.android.keyguard.NumPadKey
-                    android:id="@+id/key4"
-                    android:layout_width="@dimen/num_pad_key_width"
-                    android:layout_height="match_parent"
-                    android:layout_marginEnd="@dimen/num_pad_key_margin_end"
-                    androidprv:textView="@+id/simPinEntry"
-                    androidprv:digit="4"
-                    />
-            <com.android.keyguard.NumPadKey
-                    android:id="@+id/key5"
-                    android:layout_width="@dimen/num_pad_key_width"
-                    android:layout_height="match_parent"
-                    android:layout_marginEnd="@dimen/num_pad_key_margin_end"
-                    androidprv:textView="@+id/simPinEntry"
-                    androidprv:digit="5"
-                    />
-            <com.android.keyguard.NumPadKey
-                    android:id="@+id/key6"
-                    android:layout_width="@dimen/num_pad_key_width"
-                    android:layout_height="match_parent"
-                    androidprv:textView="@+id/simPinEntry"
-                    androidprv:digit="6"
-                    />
-        </LinearLayout>
-        <LinearLayout
-                android:layout_width="wrap_content"
-                android:layout_height="wrap_content"
-                android:orientation="horizontal"
-                android:layout_gravity="center_horizontal"
-                android:layout_marginBottom="@dimen/num_pad_row_margin_bottom"
-                >
-            <com.android.keyguard.NumPadKey
-                    android:id="@+id/key7"
-                    android:layout_width="@dimen/num_pad_key_width"
-                    android:layout_height="match_parent"
-                    android:layout_marginEnd="@dimen/num_pad_key_margin_end"
-                    androidprv:textView="@+id/simPinEntry"
-                    androidprv:digit="7"
-                    />
-            <com.android.keyguard.NumPadKey
-                    android:id="@+id/key8"
-                    android:layout_width="@dimen/num_pad_key_width"
-                    android:layout_height="match_parent"
-                    android:layout_marginEnd="@dimen/num_pad_key_margin_end"
-                    androidprv:textView="@+id/simPinEntry"
-                    androidprv:digit="8"
-                    />
-            <com.android.keyguard.NumPadKey
-                    android:id="@+id/key9"
-                    android:layout_width="@dimen/num_pad_key_width"
-                    android:layout_height="match_parent"
-                    androidprv:textView="@+id/simPinEntry"
-                    androidprv:digit="9"
-                    />
-        </LinearLayout>
-        <LinearLayout
-                android:layout_width="wrap_content"
-                android:layout_height="wrap_content"
-                android:orientation="horizontal"
-                android:layout_gravity="center_horizontal"
-                >
-            <com.android.keyguard.NumPadButton
-                    android:id="@+id/delete_button"
-                    android:layout_width="@dimen/num_pad_key_width"
-                    android:layout_height="match_parent"
-                    android:layout_marginEnd="@dimen/num_pad_key_margin_end"
-                    android:contentDescription="@string/keyboardview_keycode_delete"
-                    style="@style/NumPadKey.Delete"
-                    />
-            <com.android.keyguard.NumPadKey
-                    android:id="@+id/key0"
-                    android:layout_width="@dimen/num_pad_key_width"
-                    android:layout_height="match_parent"
-                    android:layout_marginEnd="@dimen/num_pad_key_margin_end"
-                    androidprv:textView="@+id/simPinEntry"
-                    androidprv:digit="0"
-                    />
-            <com.android.keyguard.NumPadButton
-                    android:id="@+id/key_enter"
-                    android:layout_width="@dimen/num_pad_key_width"
-                    android:layout_height="match_parent"
-                    style="@style/NumPadKey.Enter"
-                    android:contentDescription="@string/keyboardview_keycode_enter"
-                    />
-        </LinearLayout>
-    </LinearLayout>
-    <include layout="@layout/keyguard_eca"
-             android:id="@+id/keyguard_selector_fade_container"
-             android:layout_width="match_parent"
-             android:layout_height="wrap_content"
-             android:orientation="vertical"
-             android:layout_gravity="bottom|center_horizontal"
-             android:layout_marginTop="@dimen/keyguard_eca_top_margin"
-             android:layout_marginBottom="2dp"
-             android:gravity="center_horizontal"/>
+
+        <androidx.constraintlayout.helper.widget.Flow
+            android:id="@+id/flow1"
+            android:layout_width="0dp"
+            android:layout_height="0dp"
+            android:clipChildren="false"
+            android:clipToPadding="false"
+            android:orientation="horizontal"
+            androidprv:constraint_referenced_ids="key1,key2,key3,key4,key5,key6,key7,key8,key9,delete_button,key0,key_enter"
+            androidprv:flow_horizontalGap="@dimen/num_pad_key_margin_end"
+            androidprv:flow_horizontalStyle="packed"
+            androidprv:flow_maxElementsWrap="3"
+            androidprv:flow_verticalBias="1.0"
+            androidprv:flow_verticalGap="@dimen/num_pad_entry_row_margin_bottom"
+            androidprv:flow_verticalStyle="packed"
+            androidprv:flow_wrapMode="aligned"
+            androidprv:layout_constraintBottom_toBottomOf="parent"
+            androidprv:layout_constraintEnd_toEndOf="parent"
+            androidprv:layout_constraintStart_toStartOf="parent"
+            androidprv:layout_constraintTop_toBottomOf="@id/pin_area" />
+
+        <com.android.keyguard.NumPadButton
+            android:id="@+id/delete_button"
+            style="@style/NumPadKey.Delete"
+            android:layout_width="0dp"
+            android:layout_height="0dp"
+            android:accessibilityTraversalBefore="@id/key0"
+            android:contentDescription="@string/keyboardview_keycode_delete" />
+
+        <com.android.keyguard.NumPadButton
+            android:id="@+id/key_enter"
+            style="@style/NumPadKey.Enter"
+            android:layout_width="0dp"
+            android:layout_height="0dp"
+            android:contentDescription="@string/keyboardview_keycode_enter" />
+
+        <com.android.keyguard.NumPadKey
+            android:id="@+id/key1"
+            android:layout_width="0dp"
+            android:layout_height="0dp"
+            android:accessibilityTraversalBefore="@id/key2"
+            androidprv:digit="1"
+            androidprv:textView="@+id/simPinEntry" />
+
+        <com.android.keyguard.NumPadKey
+            android:id="@+id/key2"
+            android:layout_width="0dp"
+            android:layout_height="0dp"
+            android:accessibilityTraversalBefore="@id/key3"
+            androidprv:digit="2"
+            androidprv:textView="@+id/simPinEntry" />
+
+        <com.android.keyguard.NumPadKey
+            android:id="@+id/key3"
+            android:layout_width="0dp"
+            android:layout_height="0dp"
+            android:accessibilityTraversalBefore="@id/key4"
+            androidprv:digit="3"
+            androidprv:textView="@+id/simPinEntry" />
+
+        <com.android.keyguard.NumPadKey
+            android:id="@+id/key4"
+            android:layout_width="0dp"
+            android:layout_height="0dp"
+            android:accessibilityTraversalBefore="@id/key5"
+            androidprv:digit="4"
+            androidprv:textView="@+id/simPinEntry" />
+
+        <com.android.keyguard.NumPadKey
+            android:id="@+id/key5"
+            android:layout_width="0dp"
+            android:layout_height="0dp"
+            android:accessibilityTraversalBefore="@id/key6"
+            androidprv:digit="5"
+            androidprv:textView="@+id/simPinEntry" />
+
+
+        <com.android.keyguard.NumPadKey
+            android:id="@+id/key6"
+            android:layout_width="0dp"
+            android:layout_height="0dp"
+            android:accessibilityTraversalBefore="@id/key7"
+            androidprv:digit="6"
+            androidprv:textView="@+id/simPinEntry" />
+
+        <com.android.keyguard.NumPadKey
+            android:id="@+id/key7"
+            android:layout_width="0dp"
+            android:layout_height="0dp"
+            android:accessibilityTraversalBefore="@id/key8"
+            androidprv:digit="7"
+            androidprv:textView="@+id/simPinEntry" />
+
+        <com.android.keyguard.NumPadKey
+            android:id="@+id/key8"
+            android:layout_width="0dp"
+            android:layout_height="0dp"
+            android:accessibilityTraversalBefore="@id/key9"
+            androidprv:digit="8"
+            androidprv:textView="@+id/simPinEntry" />
+
+        <com.android.keyguard.NumPadKey
+            android:id="@+id/key9"
+            android:layout_width="0dp"
+            android:layout_height="0dp"
+            android:accessibilityTraversalBefore="@id/delete_button"
+            androidprv:digit="9"
+            androidprv:textView="@+id/simPinEntry" />
+
+        <com.android.keyguard.NumPadKey
+            android:id="@+id/key0"
+            android:layout_width="0dp"
+            android:layout_height="0dp"
+            android:accessibilityTraversalBefore="@id/key_enter"
+            androidprv:digit="0"
+            androidprv:textView="@+id/simPinEntry" />
+    </androidx.constraintlayout.widget.ConstraintLayout>
+
+    <include
+        android:id="@+id/keyguard_selector_fade_container"
+        layout="@layout/keyguard_eca"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_gravity="bottom|center_horizontal"
+        android:layout_marginBottom="2dp"
+        android:layout_marginTop="@dimen/keyguard_eca_top_margin"
+        android:gravity="center_horizontal"
+        android:orientation="vertical" />
 </com.android.keyguard.KeyguardSimPinView>
diff --git a/packages/SystemUI/res-keyguard/layout/keyguard_sim_puk_view.xml b/packages/SystemUI/res-keyguard/layout/keyguard_sim_puk_view.xml
index 422bd4c12e8ee..7e24d1231aee9 100644
--- a/packages/SystemUI/res-keyguard/layout/keyguard_sim_puk_view.xml
+++ b/packages/SystemUI/res-keyguard/layout/keyguard_sim_puk_view.xml
@@ -21,6 +21,7 @@
 <com.android.keyguard.KeyguardSimPukView
         xmlns:android="http://schemas.android.com/apk/res/android"
         xmlns:androidprv="http://schemas.android.com/apk/res-auto"
+        xmlns:app="http://schemas.android.com/apk/res-auto"
         android:id="@+id/keyguard_sim_puk_view"
         android:orientation="vertical"
         android:layout_width="match_parent"
@@ -29,173 +30,165 @@
         android:layout_gravity="center_horizontal|bottom">
     <include layout="@layout/keyguard_bouncer_message_area"/>
 
-    <Space
+    <androidx.constraintlayout.widget.ConstraintLayout
         android:layout_width="match_parent"
         android:layout_height="0dp"
-        android:layout_weight="1" />
-
-    <ImageView
-            android:id="@+id/keyguard_sim"
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:tint="@color/background_protected"
-            android:src="@drawable/ic_lockscreen_sim"/>
-
-    <LinearLayout
+        android:layout_weight="1"
+        android:layoutDirection="ltr">
+        <LinearLayout
+            android:id="@+id/pin_area"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:orientation="vertical"
-            android:gravity="center"
-            android:layoutDirection="ltr"
-            >
-        <include layout="@layout/keyguard_esim_area"
-            android:id="@+id/keyguard_esim_area"
-            android:layout_width="wrap_content"
-            android:layout_height="wrap_content" />
+            android:gravity="center_horizontal"
+            android:paddingTop="@dimen/num_pad_entry_row_margin_bottom"
+            android:paddingBottom="@dimen/num_pad_entry_row_margin_bottom"
+            androidprv:layout_constraintBottom_toTopOf="@+id/flow1"
+            androidprv:layout_constraintEnd_toEndOf="parent"
+            androidprv:layout_constraintStart_toStartOf="parent"
+            androidprv:layout_constraintTop_toTopOf="parent">
 
-        <RelativeLayout
-                android:id="@+id/row0"
-                android:layout_width="match_parent"
-                android:layout_height="wrap_content"
-                android:paddingBottom="4dp"
-                >
+            <ImageView
+                android:id="@+id/keyguard_sim"
+                android:layout_width="40dp"
+                android:layout_height="40dp"
+                android:layout_gravity="center_horizontal"
+                android:src="@drawable/ic_lockscreen_sim"
+                app:tint="@color/background_protected" />
+
+            <include
+                android:id="@+id/keyguard_esim_area"
+                layout="@layout/keyguard_esim_area"
+                android:layout_gravity="center_horizontal"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content" />
 
             <com.android.keyguard.PasswordTextView
                 android:id="@+id/pukEntry"
                 style="@style/Widget.TextView.Password"
                 android:layout_width="@dimen/keyguard_security_width"
                 android:layout_height="@dimen/keyguard_password_height"
-                android:layout_centerHorizontal="true"
-                android:layout_marginRight="72dp"
-                android:contentDescription="@string/keyguard_accessibility_sim_puk_area"
-                android:gravity="center"
+                android:contentDescription="@string/keyguard_accessibility_sim_pin_area"
+                android:layout_gravity="center_horizontal"
                 androidprv:scaledTextSize="@integer/scaled_password_text_size" />
-        </RelativeLayout>
-        <LinearLayout
-                android:layout_width="wrap_content"
-                android:layout_height="wrap_content"
-                android:orientation="horizontal"
-                android:layout_gravity="center_horizontal"
-                android:layout_marginBottom="@dimen/num_pad_row_margin_bottom"
-                >
-            <com.android.keyguard.NumPadKey
-                    android:id="@+id/key1"
-                    android:layout_width="@dimen/num_pad_key_width"
-                    android:layout_height="match_parent"
-                    android:layout_marginEnd="@dimen/num_pad_key_margin_end"
-                    androidprv:textView="@+id/pukEntry"
-                    androidprv:digit="1"
-                    />
-            <com.android.keyguard.NumPadKey
-                    android:id="@+id/key2"
-                    android:layout_width="@dimen/num_pad_key_width"
-                    android:layout_height="match_parent"
-                    android:layout_marginEnd="@dimen/num_pad_key_margin_end"
-                    androidprv:textView="@+id/pukEntry"
-                    androidprv:digit="2"
-                    />
-            <com.android.keyguard.NumPadKey
-                    android:id="@+id/key3"
-                    android:layout_width="@dimen/num_pad_key_width"
-                    android:layout_height="match_parent"
-                    androidprv:textView="@+id/pukEntry"
-                    androidprv:digit="3"
-                    />
         </LinearLayout>
-        <LinearLayout
-                android:layout_width="wrap_content"
-                android:layout_height="wrap_content"
-                android:orientation="horizontal"
-                android:layout_gravity="center_horizontal"
-                android:layout_marginBottom="@dimen/num_pad_row_margin_bottom"
 
-                >
-            <com.android.keyguard.NumPadKey
-                    android:id="@+id/key4"
-                    android:layout_width="@dimen/num_pad_key_width"
-                    android:layout_height="match_parent"
-                    android:layout_marginEnd="@dimen/num_pad_key_margin_end"
-                    androidprv:textView="@+id/pukEntry"
-                    androidprv:digit="4"
-                    />
-            <com.android.keyguard.NumPadKey
-                    android:id="@+id/key5"
-                    android:layout_width="@dimen/num_pad_key_width"
-                    android:layout_height="match_parent"
-                    android:layout_marginEnd="@dimen/num_pad_key_margin_end"
-                    androidprv:textView="@+id/pukEntry"
-                    androidprv:digit="5"
-                    />
-            <com.android.keyguard.NumPadKey
-                    android:id="@+id/key6"
-                    android:layout_width="@dimen/num_pad_key_width"
-                    android:layout_height="match_parent"
-                    androidprv:textView="@+id/pukEntry"
-                    androidprv:digit="6"
-                    />
-        </LinearLayout>
-        <LinearLayout
-                android:layout_width="wrap_content"
-                android:layout_height="wrap_content"
-                android:orientation="horizontal"
-                android:layout_gravity="center_horizontal"
-                android:layout_marginBottom="@dimen/num_pad_row_margin_bottom"
-                >
-            <com.android.keyguard.NumPadKey
-                    android:id="@+id/key7"
-                    android:layout_width="@dimen/num_pad_key_width"
-                    android:layout_height="match_parent"
-                    android:layout_marginEnd="@dimen/num_pad_key_margin_end"
-                    androidprv:textView="@+id/pukEntry"
-                    androidprv:digit="7"
-                    />
-            <com.android.keyguard.NumPadKey
-                    android:id="@+id/key8"
-                    android:layout_width="@dimen/num_pad_key_width"
-                    android:layout_height="match_parent"
-                    android:layout_marginEnd="@dimen/num_pad_key_margin_end"
-                    androidprv:textView="@+id/pukEntry"
-                    androidprv:digit="8"
-                    />
-            <com.android.keyguard.NumPadKey
-                    android:id="@+id/key9"
-                    android:layout_width="@dimen/num_pad_key_width"
-                    android:layout_height="match_parent"
-                    androidprv:textView="@+id/pukEntry"
-                    androidprv:digit="9"
-                    />
-        </LinearLayout>
-        <LinearLayout
-                android:layout_width="wrap_content"
-                android:layout_height="wrap_content"
-                android:orientation="horizontal"
-                android:layout_gravity="center_horizontal"
-                >
-            <com.android.keyguard.NumPadButton
-                    android:id="@+id/delete_button"
-                    android:layout_width="@dimen/num_pad_key_width"
-                    android:layout_height="match_parent"
-                    android:layout_marginEnd="@dimen/num_pad_key_margin_end"
-                    android:contentDescription="@string/keyboardview_keycode_delete"
-                    style="@style/NumPadKey.Delete"
-                    />
-            <com.android.keyguard.NumPadKey
-                    android:id="@+id/key0"
-                    android:layout_width="@dimen/num_pad_key_width"
-                    android:layout_height="match_parent"
-                    android:layout_marginEnd="@dimen/num_pad_key_margin_end"
-                    androidprv:textView="@+id/pukEntry"
-                    androidprv:digit="0"
-                    />
-            <com.android.keyguard.NumPadButton
-                    android:id="@+id/key_enter"
-                    android:layout_width="@dimen/num_pad_key_width"
-                    android:layout_height="match_parent"
-                    style="@style/NumPadKey.Enter"
-                    android:contentDescription="@string/keyboardview_keycode_enter"
-                    />
-        </LinearLayout>
-    </LinearLayout>
+        <androidx.constraintlayout.helper.widget.Flow
+            android:id="@+id/flow1"
+            android:layout_width="0dp"
+            android:layout_height="0dp"
+            android:clipChildren="false"
+            android:clipToPadding="false"
+            android:orientation="horizontal"
+            androidprv:constraint_referenced_ids="key1,key2,key3,key4,key5,key6,key7,key8,key9,delete_button,key0,key_enter"
+            androidprv:flow_horizontalGap="@dimen/num_pad_key_margin_end"
+            androidprv:flow_horizontalStyle="packed"
+            androidprv:flow_maxElementsWrap="3"
+            androidprv:flow_verticalBias="1.0"
+            androidprv:flow_verticalGap="@dimen/num_pad_entry_row_margin_bottom"
+            androidprv:flow_verticalStyle="packed"
+            androidprv:flow_wrapMode="aligned"
+            androidprv:layout_constraintBottom_toBottomOf="parent"
+            androidprv:layout_constraintEnd_toEndOf="parent"
+            androidprv:layout_constraintStart_toStartOf="parent"
+            androidprv:layout_constraintTop_toBottomOf="@id/pin_area" />
+
+        <com.android.keyguard.NumPadButton
+            android:id="@+id/delete_button"
+            style="@style/NumPadKey.Delete"
+            android:layout_width="0dp"
+            android:layout_height="0dp"
+            android:accessibilityTraversalBefore="@id/key0"
+            android:contentDescription="@string/keyboardview_keycode_delete" />
+
+        <com.android.keyguard.NumPadButton
+            android:id="@+id/key_enter"
+            style="@style/NumPadKey.Enter"
+            android:layout_width="0dp"
+            android:layout_height="0dp"
+            android:contentDescription="@string/keyboardview_keycode_enter" />
+
+        <com.android.keyguard.NumPadKey
+            android:id="@+id/key1"
+            android:layout_width="0dp"
+            android:layout_height="0dp"
+            android:accessibilityTraversalBefore="@id/key2"
+            androidprv:digit="1"
+            androidprv:textView="@+id/pukEntry" />
+
+        <com.android.keyguard.NumPadKey
+            android:id="@+id/key2"
+            android:layout_width="0dp"
+            android:layout_height="0dp"
+            android:accessibilityTraversalBefore="@id/key3"
+            androidprv:digit="2"
+            androidprv:textView="@+id/pukEntry" />
+
+        <com.android.keyguard.NumPadKey
+            android:id="@+id/key3"
+            android:layout_width="0dp"
+            android:layout_height="0dp"
+            android:accessibilityTraversalBefore="@id/key4"
+            androidprv:digit="3"
+            androidprv:textView="@+id/pukEntry" />
+
+        <com.android.keyguard.NumPadKey
+            android:id="@+id/key4"
+            android:layout_width="0dp"
+            android:layout_height="0dp"
+            android:accessibilityTraversalBefore="@id/key5"
+            androidprv:digit="4"
+            androidprv:textView="@+id/pukEntry" />
+
+        <com.android.keyguard.NumPadKey
+            android:id="@+id/key5"
+            android:layout_width="0dp"
+            android:layout_height="0dp"
+            android:accessibilityTraversalBefore="@id/key6"
+            androidprv:digit="5"
+            androidprv:textView="@+id/pukEntry" />
+
+
+        <com.android.keyguard.NumPadKey
+            android:id="@+id/key6"
+            android:layout_width="0dp"
+            android:layout_height="0dp"
+            android:accessibilityTraversalBefore="@id/key7"
+            androidprv:digit="6"
+            androidprv:textView="@+id/pukEntry" />
+
+        <com.android.keyguard.NumPadKey
+            android:id="@+id/key7"
+            android:layout_width="0dp"
+            android:layout_height="0dp"
+            android:accessibilityTraversalBefore="@id/key8"
+            androidprv:digit="7"
+            androidprv:textView="@+id/pukEntry" />
+
+        <com.android.keyguard.NumPadKey
+            android:id="@+id/key8"
+            android:layout_width="0dp"
+            android:layout_height="0dp"
+            android:accessibilityTraversalBefore="@id/key9"
+            androidprv:digit="8"
+            androidprv:textView="@+id/pukEntry" />
+
+        <com.android.keyguard.NumPadKey
+            android:id="@+id/key9"
+            android:layout_width="0dp"
+            android:layout_height="0dp"
+            android:accessibilityTraversalBefore="@id/delete_button"
+            androidprv:digit="9"
+            androidprv:textView="@+id/pukEntry" />
+
+        <com.android.keyguard.NumPadKey
+            android:id="@+id/key0"
+            android:layout_width="0dp"
+            android:layout_height="0dp"
+            android:accessibilityTraversalBefore="@id/key_enter"
+            androidprv:digit="0"
+            androidprv:textView="@+id/pukEntry" />
+    </androidx.constraintlayout.widget.ConstraintLayout>
 
     <include layout="@layout/keyguard_eca"
              android:id="@+id/keyguard_selector_fade_container"
diff --git a/packages/SystemUI/src/com/android/keyguard/NumPadAnimator.java b/packages/SystemUI/src/com/android/keyguard/NumPadAnimator.java
index b30a0e010e4bb..ad669099284f3 100644
--- a/packages/SystemUI/src/com/android/keyguard/NumPadAnimator.java
+++ b/packages/SystemUI/src/com/android/keyguard/NumPadAnimator.java
@@ -51,7 +51,6 @@ class NumPadAnimator {
     private float mStartRadius;
     private float mEndRadius;
     private int mHeight;
-    private boolean mInitialized;
 
     private static final int EXPAND_ANIMATION_MS = 100;
     private static final int EXPAND_COLOR_ANIMATION_MS = 50;
@@ -93,15 +92,15 @@ class NumPadAnimator {
     }
 
     void onLayout(int height) {
+        boolean shouldUpdateHeight = height != mHeight;
         mHeight = height;
         mStartRadius = height / 2f;
         mEndRadius = height / 4f;
         mExpandAnimator.setFloatValues(mStartRadius, mEndRadius);
         mContractAnimator.setFloatValues(mEndRadius, mStartRadius);
         // Set initial corner radius.
-        if (!mInitialized) {
+        if (shouldUpdateHeight) {
             mBackground.setCornerRadius(mStartRadius);
-            mInitialized = true;
         }
     }