linphone-android/app/src/main/res/layout/dialer_fragment.xml

<?xml version="1.0" encoding="utf-8"?>
<layout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">

    <data>
        <import type="android.view.View"/>
        <variable
            name="newContactClickListener"
            type="android.view.View.OnClickListener"/>
        <variable
            name="newConferenceClickListener"
            type="android.view.View.OnClickListener"/>
        <variable
            name="transferCallClickListener"
            type="android.view.View.OnClickListener"/>
        <variable
            name="viewModel"
            type="org.linphone.activities.main.dialer.viewmodels.DialerViewModel"/>
    </data>

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <RelativeLayout
            android:id="@+id/address_bar"
            android:layout_width="match_parent"
            android:layout_height="@dimen/main_activity_top_bar_size"
            android:layout_alignParentTop="true"
            android:background="?attr/lightToolbarBackgroundColor">

            <ImageView
                android:id="@+id/erase"
                android:onClick="@{() -> viewModel.eraseLastChar()}"
                android:onLongClick="@{() -> viewModel.eraseAll()}"
                android:contentDescription="@string/content_description_dialer_erase"
                android:layout_width="wrap_content"
                android:layout_height="match_parent"
                android:paddingLeft="10dp"
                android:paddingRight="10dp"
                android:layout_alignParentRight="true"
                android:layout_centerVertical="true"
                android:focusableInTouchMode="true"
                android:src="@drawable/backspace" />

            <EditText
                android:id="@+id/sip_uri_input"
                android:text="@={viewModel.enteredUri}"
                android:beforeTextChanged="@{(text, start, count, after) -> viewModel.onBeforeUriChanged(sipUriInput, count, after)}"
                android:afterTextChanged="@{(text) -> viewModel.onAfterUriChanged(sipUriInput, text)}"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_centerVertical="true"
                android:layout_toLeftOf="@id/erase"
                android:background="@color/transparent_color"
                android:backgroundTint="@color/transparent_color"
                android:ellipsize="start"
                android:hint="@string/dialer_address_bar_hint"
                android:inputType="textEmailAddress|textUri"
                android:paddingLeft="20dp"
                android:paddingRight="5dp"
                android:textColorHint="@color/light_grey_color" />

        </RelativeLayout>

        <LinearLayout
            android:id="@+id/controls"
            android:layout_width="match_parent"
            android:layout_height="60dp"
            android:layout_alignParentBottom="true">

            <ImageView
                android:onClick="@{newConferenceClickListener}"
                android:visibility="@{viewModel.scheduleConferenceAvailable ? View.VISIBLE : View.GONE}"
                android:contentDescription="@string/content_description_create_conference"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_weight="2"
                android:background="?attr/button_background_drawable"
                android:padding="5dp"
                android:src="@drawable/icon_video_conf_new" />

            <ImageView
                android:onClick="@{newContactClickListener}"
                android:visibility="@{viewModel.scheduleConferenceAvailable ? View.GONE : View.VISIBLE, default=gone}"
                android:enabled="@{viewModel.enteredUri.length() > 0}"
                android:contentDescription="@string/content_description_add_contact"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_weight="2"
                android:background="?attr/button_background_drawable"
                android:padding="15dp"
                android:src="@drawable/contact_add" />

            <ImageView
                android:onClick="@{() -> viewModel.startCall()}"
                android:visibility="@{viewModel.atLeastOneCall ? View.GONE : View.VISIBLE}"
                android:contentDescription="@string/content_description_start_call"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:background="@drawable/call"
                android:padding="12dp"
                android:src="@{viewModel.autoInitiateVideoCalls ? @drawable/call_video_start : @drawable/call_audio_start, default=@drawable/call_audio_start}" />

            <ImageView
                android:onClick="@{() -> viewModel.startCall()}"
                android:visibility="@{viewModel.atLeastOneCall &amp;&amp; !viewModel.transferVisibility ? View.VISIBLE : View.GONE, default=gone}"
                android:contentDescription="@string/content_description_add_call"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:background="@drawable/call"
                android:padding="12dp"
                android:src="@drawable/call_add" />

            <ImageView
                android:onClick="@{transferCallClickListener}"
                android:visibility="@{viewModel.atLeastOneCall &amp;&amp; viewModel.transferVisibility ? View.VISIBLE : View.GONE, default=gone}"
                android:contentDescription="@string/content_description_transfer_call"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:background="@drawable/call"
                android:padding="12dp"
                android:src="@drawable/call_transfer" />

        </LinearLayout>

        <include
            layout="@layout/numpad"
            android:layout_above="@id/controls"
            android:layout_below="@id/address_bar"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:keyListener="@{viewModel.onKeyClick}" />

    </RelativeLayout>

</layout>