linphone-android/app/src/main/res/layout/call_start_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="backClickListener"
            type="View.OnClickListener" />
        <variable
            name="viewModel"
            type="org.linphone.ui.main.calls.viewmodel.StartCallViewModel" />
    </data>

    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@color/white">

        <ImageView
            android:id="@+id/back"
            android:onClick="@{backClickListener}"
            android:layout_width="wrap_content"
            android:layout_height="35dp"
            android:layout_marginStart="10dp"
            android:adjustViewBounds="true"
            android:padding="5dp"
            android:src="@drawable/back"
            android:drawableTint="@color/primary_color"
            app:layout_constraintBottom_toBottomOf="@id/title"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="@id/title" />

        <androidx.appcompat.widget.AppCompatTextView
            style="@style/default_text_style_800"
            android:id="@+id/title"
            android:layout_width="0dp"
            android:layout_height="@dimen/top_bar_height"
            android:layout_marginStart="10dp"
            android:layout_marginEnd="10dp"
            android:gravity="center_vertical"
            android:text="New call"
            android:textColor="@color/primary_color"
            android:textSize="16sp"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toEndOf="@id/back"
            app:layout_constraintTop_toTopOf="parent"/>

        <androidx.appcompat.widget.AppCompatEditText
            style="@style/default_text_style"
            android:id="@+id/search_bar"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="30dp"
            android:layout_marginStart="20dp"
            android:layout_marginEnd="20dp"
            android:paddingTop="10dp"
            android:paddingBottom="10dp"
            android:paddingStart="15dp"
            android:paddingEnd="15dp"
            android:drawableStart="@drawable/search"
            android:drawableEnd="@drawable/dialer"
            android:drawablePadding="10dp"
            android:drawableTint="@color/gray_9"
            android:background="@drawable/shape_search_square_background"
            android:hint="Search contact or history call"
            android:text="@={viewModel.searchFilter}"
            android:textSize="14sp"
            android:inputType="textPersonName|textNoSuggestions"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintTop_toBottomOf="@id/title" />

        <ImageView
            android:id="@+id/group_call_icon"
            android:visibility="@{viewModel.searchFilter.length() > 0 ? View.GONE : View.VISIBLE}"
            android:layout_width="44dp"
            android:layout_height="44dp"
            android:layout_marginStart="16dp"
            android:layout_marginTop="40dp"
            android:padding="10dp"
            android:src="@drawable/meetings"
            android:background="@drawable/shape_orange_round"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@id/search_bar" />

        <androidx.appcompat.widget.AppCompatTextView
            style="@style/default_text_style_800"
            android:id="@+id/group_call_label"
            android:visibility="@{viewModel.searchFilter.length() > 0 ? View.GONE : View.VISIBLE}"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:padding="5dp"
            android:layout_marginStart="16dp"
            android:layout_marginEnd="16dp"
            android:text="Create a group call"
            android:textSize="16sp"
            android:textColor="@color/black"
            android:drawableEnd="@drawable/arrow"
            app:layout_constraintStart_toEndOf="@id/group_call_icon"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintTop_toTopOf="@id/group_call_icon"
            app:layout_constraintBottom_toBottomOf="@id/group_call_icon"/>

        <ImageView
            android:id="@+id/no_contacts_nor_suggestion_image"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:src="@drawable/illu"
            android:layout_margin="10dp"
            android:visibility="@{viewModel.emptyContactsList &amp;&amp; viewModel.emptySuggestionsList ? View.VISIBLE : View.GONE}"
            app:layout_constraintHeight_max="200dp"
            app:layout_constraintDimensionRatio="1:1"
            app:layout_constraintVertical_chainStyle="packed"
            app:layout_constraintBottom_toTopOf="@id/no_contacts_nor_suggestion_label"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@id/group_call_icon" />

        <androidx.appcompat.widget.AppCompatTextView
            style="@style/default_text_style_800"
            android:id="@+id/no_contacts_nor_suggestion_label"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="No suggestion and no contact for the moment..."
            android:textSize="16sp"
            android:visibility="@{viewModel.emptyContactsList &amp;&amp; viewModel.emptySuggestionsList ? View.VISIBLE : View.GONE}"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintTop_toBottomOf="@id/no_contacts_nor_suggestion_image" />

        <androidx.appcompat.widget.AppCompatTextView
            style="@style/default_text_style_800"
            android:id="@+id/all_contacts_label"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:padding="5dp"
            android:layout_marginStart="16dp"
            android:layout_marginEnd="16dp"
            android:layout_marginTop="16dp"
            android:text="Contacts"
            android:textSize="16sp"
            android:visibility="@{viewModel.emptyContactsList ? View.GONE : View.VISIBLE}"
            app:layout_constraintVertical_bias="0"
            app:layout_constraintVertical_chainStyle="packed"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintTop_toBottomOf="@id/group_call_icon"
            app:layout_constraintBottom_toTopOf="@id/contacts_list"/>

        <androidx.recyclerview.widget.RecyclerView
            android:id="@+id/contacts_list"
            android:layout_width="0dp"
            android:layout_height="0dp"
            android:layout_marginTop="8dp"
            android:visibility="@{viewModel.emptyContactsList ? View.GONE : View.VISIBLE}"
            app:layout_constraintVertical_bias="0"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintTop_toBottomOf="@id/all_contacts_label"
            app:layout_constraintBottom_toTopOf="@id/suggestions_label"/>

        <androidx.appcompat.widget.AppCompatTextView
            style="@style/default_text_style_800"
            android:id="@+id/suggestions_label"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:padding="5dp"
            android:layout_marginStart="16dp"
            android:layout_marginEnd="16dp"
            android:layout_marginTop="16dp"
            android:text="Suggestions"
            android:textSize="16sp"
            android:visibility="@{viewModel.emptySuggestionsList ? View.GONE : View.VISIBLE}"
            app:layout_constraintVertical_bias="0"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintTop_toBottomOf="@id/contacts_list"
            app:layout_constraintBottom_toTopOf="@id/suggestions_list"/>

        <androidx.recyclerview.widget.RecyclerView
            android:id="@+id/suggestions_list"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginTop="8dp"
            android:visibility="@{viewModel.emptySuggestionsList ? View.GONE : View.VISIBLE}"
            app:layout_constraintVertical_bias="0"
            app:layout_constraintHeight_max="220dp"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintTop_toBottomOf="@id/suggestions_label"
            app:layout_constraintBottom_toBottomOf="parent"/>

    </androidx.constraintlayout.widget.ConstraintLayout>

</layout>