packages/SystemUI/res/layout/status_bar_wifi_group.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
**
** Copyright 2018, 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.StatusBarWifiView
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:systemui="http://schemas.android.com/apk/res-auto"
    android:id="@+id/wifi_combo"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    android:gravity="center_vertical" >

    <com.android.keyguard.AlphaOptimizedLinearLayout
        android:id="@+id/wifi_group"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:paddingStart="2dp"
        android:gravity="center_vertical"
    >
        <FrameLayout
                android:id="@+id/inout_container"
                android:layout_height="17dp"
                android:layout_width="wrap_content"
                android:gravity="center_vertical" >
            <ImageView
                android:id="@+id/wifi_in"
                android:layout_height="wrap_content"
                android:layout_width="wrap_content"
                android:src="@drawable/ic_activity_down"
                android:visibility="gone"
                android:paddingEnd="2dp"
            />
            <ImageView
                android:id="@+id/wifi_out"
                android:layout_height="wrap_content"
                android:layout_width="wrap_content"
                android:src="@drawable/ic_activity_up"
                android:paddingEnd="2dp"
                android:visibility="gone"
            />
        </FrameLayout>
        <FrameLayout
            android:id="@+id/wifi_combo"
            android:layout_height="wrap_content"
            android:layout_width="wrap_content"
            android:gravity="center_vertical" >
            <com.android.systemui.statusbar.AlphaOptimizedImageView
                android:theme="?attr/lightIconTheme"
                android:id="@+id/wifi_signal"
                android:layout_height="wrap_content"
                android:layout_width="wrap_content" />
        </FrameLayout>

        <View
            android:id="@+id/wifi_signal_spacer"
            android:layout_width="@dimen/status_bar_wifi_signal_spacer_width"
            android:layout_height="4dp"
            android:visibility="gone" />

        <!-- Looks like CarStatusBar uses this... -->
        <ViewStub
            android:id="@+id/connected_device_signals_stub"
            android:layout="@layout/connected_device_signal"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />

        <View
            android:id="@+id/wifi_airplane_spacer"
            android:layout_width="@dimen/status_bar_airplane_spacer_width"
            android:layout_height="4dp"
            android:visibility="gone"
        />
    </com.android.keyguard.AlphaOptimizedLinearLayout>
</com.android.systemui.statusbar.StatusBarWifiView>