nextcloud-talk-android/app/src/main/res/layout/controller_call_notification.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
  ~ Nextcloud Talk application
  ~
  ~ @author Mario Danic
  ~ Copyright (C) 2017-2018 Mario Danic <mario@lovelyhq.com>
  ~
  ~ This program is free software: you can redistribute it and/or modify
  ~ it under the terms of the GNU General Public License as published by
  ~ the Free Software Foundation, either version 3 of the License, or
  ~ at your option) any later version.
  ~
  ~ This program is distributed in the hope that it will be useful,
  ~ but WITHOUT ANY WARRANTY; without even the implied warranty of
  ~ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  ~ GNU General Public License for more details.
  ~
  ~ You should have received a copy of the GNU General Public License
  ~ along with this program.  If not, see <http://www.gnu.org/licenses/>.
  -->

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:background="@color/white">


    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:layout_alignParentTop="true"
        android:text="@string/nc_incoming_call"
        android:textAlignment="center"
        android:textColor="@color/colorPrimary"
        android:textSize="20sp"
        android:layout_marginTop="48dp"
        android:id="@+id/incomingCallTextView"/>

    <ImageView
        android:id="@+id/avatarImageView"
        android:layout_width="@dimen/avatar_size_big"
        android:layout_height="@dimen/avatar_size_big"
        android:layout_centerHorizontal="true"
        android:layout_below="@id/incomingCallTextView"
        android:layout_margin="16dp"/>

    <TextView
        android:id="@+id/conversationNameTextView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/avatarImageView"
        android:layout_centerInParent="true"
        android:textAlignment="center"
        android:textColor="@color/colorPrimary"
        android:textSize="16sp"
        />


    <com.nextcloud.talk.utils.MagicFlipView
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:id="@+id/callAnswerVoiceOnlyView"
        android:layout_width="60dp"
        android:layout_height="60dp"
        android:layout_above="@id/callControlHangupView"
        android:layout_centerHorizontal="true"
        android:layout_toStartOf="@id/callControlHangupView"
        app:checked="false"
        app:enableInitialAnimation="false"
        app:frontBackgroundColor="@color/colorPrimary"
        app:frontImage="@drawable/ic_mic_white_24px"/>

    <com.nextcloud.talk.utils.MagicFlipView
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:id="@+id/callAnswerCameraView"
        android:layout_width="60dp"
        android:layout_height="60dp"
        android:layout_above="@id/callControlHangupView"
        android:layout_toEndOf="@id/callControlHangupView"
        app:checked="false"
        app:enableInitialAnimation="false"
        app:frontBackgroundColor="@color/colorPrimary"
        app:frontImage="@drawable/ic_videocam_white_24px"/>


    <com.nextcloud.talk.utils.MagicFlipView
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:id="@+id/callControlHangupView"
        android:layout_width="60dp"
        android:layout_height="60dp"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="24dp"
        android:layout_marginBottom="64dp"
        app:checked="false"
        app:enableInitialAnimation="false"
        app:frontBackgroundColor="@color/nc_darkRed"
        app:frontImage="@drawable/ic_call_end_white_24px"/>


</RelativeLayout>