packages/SystemUI/res-keyguard/layout/keyguard_host_view.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
**
** Copyright 2012, 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.
*/
-->

<!-- This is the host view that generally contains two sub views: the widget view
    and the security view. -->
<com.android.keyguard.KeyguardHostView
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:androidprv="http://schemas.android.com/apk/res-auto"
    android:id="@+id/keyguard_host_view"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:clipChildren="false"
    android:clipToPadding="false"
    android:importantForAccessibility="yes"> <!-- Needed because TYPE_WINDOW_STATE_CHANGED is sent
                                                  from this view when bouncer is shown -->

    <com.android.keyguard.KeyguardSecurityContainer
        android:id="@+id/keyguard_security_container"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        androidprv:layout_maxHeight="@dimen/keyguard_security_max_height"
        android:clipChildren="false"
        android:clipToPadding="false"
        android:padding="0dp"
        android:layout_gravity="center">
        <com.android.keyguard.KeyguardSecurityViewFlipper
            android:id="@+id/view_flipper"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:clipChildren="false"
            android:clipToPadding="false"
            android:paddingTop="@dimen/keyguard_security_view_top_margin"
            android:paddingStart="@dimen/keyguard_security_view_lateral_margin"
            android:paddingEnd="@dimen/keyguard_security_view_lateral_margin"
            android:gravity="center">
        </com.android.keyguard.KeyguardSecurityViewFlipper>
    </com.android.keyguard.KeyguardSecurityContainer>

</com.android.keyguard.KeyguardHostView>