packages/SystemUI/res/layout/keyguard_bottom_area.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
  ~ Copyright (C) 2014 The Android Open Source Project
  ~
  ~ Licensed under the Apache License, Version 2.0 (the "License");
  ~ you may not use this file except in compliance with the License.
  ~ You may obtain a copy of the License at
  ~
  ~      http://www.apache.org/licenses/LICENSE-2.0
  ~
  ~ Unless required by applicable law or agreed to in writing, software
  ~ distributed under the License is distributed on an "AS IS" BASIS,
  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  ~ See the License for the specific language governing permissions and
  ~ limitations under the License
  -->

<com.android.systemui.statusbar.phone.KeyguardBottomAreaView
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:systemui="http://schemas.android.com/apk/res/com.android.systemui"
    android:id="@+id/keyguard_bottom_area"
    android:layout_height="match_parent"
    android:layout_width="match_parent"
    >
    <com.android.systemui.statusbar.phone.SwipeAffordanceView
        android:id="@+id/camera_button"
        android:layout_height="64dp"
        android:layout_width="64dp"
        android:layout_gravity="bottom|end"
        android:tint="#ffffffff"
        android:src="@drawable/ic_camera_alt_24dp"
        android:scaleType="center"
        android:contentDescription="@string/accessibility_camera_button"
        systemui:swipeDirection="start"/>

    <com.android.systemui.statusbar.phone.SwipeAffordanceView
        android:id="@+id/phone_button"
        android:layout_height="64dp"
        android:layout_width="64dp"
        android:layout_gravity="bottom|start"
        android:tint="#ffffffff"
        android:src="@drawable/ic_phone_24dp"
        android:scaleType="center"
        android:contentDescription="@string/accessibility_phone_button"
        systemui:swipeDirection="end"/>

    <com.android.systemui.statusbar.phone.KeyguardIndicationTextView
        android:id="@+id/keyguard_indication_text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="100dp"
        android:layout_gravity="bottom|center_horizontal"
        android:textStyle="italic"
        android:textColor="#ffffff"
        android:textAppearance="?android:attr/textAppearanceSmall"/>

    <ImageView
        android:id="@+id/lock_icon"
        android:layout_width="64dp"
        android:layout_height="64dp"
        android:layout_gravity="bottom|center_horizontal"
        android:src="@drawable/ic_lock_24dp"
        android:scaleType="center"
        android:alpha="0.7"
        android:layerType="hardware"
        android:tint="#ffffffff"/>

</com.android.systemui.statusbar.phone.KeyguardBottomAreaView>