linphone-android/app/src/main/res/layout/file_viewer_activity.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="shareClickListener"
            type="View.OnClickListener" />
        <variable
            name="viewModel"
            type="org.linphone.ui.fileviewer.viewmodel.FileViewModel" />
    </data>

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

        <androidx.constraintlayout.widget.Group
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:visibility="@{viewModel.fullScreenMode ? View.GONE : View.VISIBLE}"
            app:constraint_referenced_ids="top_bar_background, back, file_name, date_time"/>

        <androidx.constraintlayout.widget.Barrier
            android:id="@+id/top_bar_barrier"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            app:constraint_referenced_ids="back, date_time"
            app:barrierDirection="bottom" />

        <androidx.viewpager2.widget.ViewPager2
            android:id="@+id/pdf_view_pager"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="horizontal"
            android:background="@color/bc_white"
            android:visibility="@{viewModel.isPdf ? View.VISIBLE : View.GONE, default=gone}" />

        <androidx.appcompat.widget.AppCompatTextView
            style="@style/default_text_style"
            android:id="@+id/pages_indicator"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginBottom="10dp"
            android:paddingStart="5dp"
            android:paddingEnd="5dp"
            android:paddingTop="2dp"
            android:paddingBottom="2dp"
            android:visibility="@{viewModel.isPdf ? View.VISIBLE : View.GONE, default=gone}"
            android:text="@{viewModel.pdfCurrentPage + ` / ` + viewModel.pdfPages, default=`1 / 30`}"
            android:textColor="@color/bc_white"
            android:background="#80000000"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintStart_toStartOf="@id/pdf_view_pager"
            app:layout_constraintEnd_toEndOf="@id/pdf_view_pager" />

        <ScrollView
            android:id="@+id/text"
            android:onClick="@{() -> viewModel.toggleFullScreen()}"
            android:background="?attr/color_main2_000"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:fillViewport="true"
            android:visibility="@{viewModel.isText ? View.VISIBLE : View.GONE, default=gone}" >

            <TextView
                style="@style/default_text_style"
                android:onClick="@{() -> viewModel.toggleFullScreen()}"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginStart="10dp"
                android:layout_marginEnd="10dp"
                android:singleLine="false"
                android:textIsSelectable="true"
                android:textColor="?attr/color_main2_900"
                android:text="@{viewModel.text}"/>

        </ScrollView>

        <View
            android:id="@+id/top_bar_background"
            android:layout_width="0dp"
            android:layout_height="0dp"
            android:background="@color/bc_white"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintBottom_toBottomOf="@id/top_bar_barrier"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintEnd_toEndOf="parent" />

        <ImageView
            android:id="@+id/back"
            android:onClick="@{backClickListener}"
            android:layout_width="wrap_content"
            android:layout_height="@dimen/top_bar_height"
            android:adjustViewBounds="true"
            android:padding="15dp"
            android:src="@drawable/caret_left"
            android:contentDescription="@string/content_description_go_back_icon"
            android:background="@drawable/circle_transparent_button_background"
            app:tint="?attr/color_main1_500"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent" />

        <androidx.appcompat.widget.AppCompatTextView
            style="@style/default_text_style_700"
            android:id="@+id/file_name"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginStart="10dp"
            android:layout_marginEnd="10dp"
            android:text="@{viewModel.fileName, default=`nomdufichier.jpg`}"
            android:textSize="13sp"
            android:textColor="@color/gray_main2_600"
            android:maxLines="1"
            android:ellipsize="end"
            app:layout_constraintVertical_chainStyle="packed"
            app:layout_constraintEnd_toStartOf="@id/share"
            app:layout_constraintStart_toEndOf="@id/back"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintBottom_toTopOf="@id/date_time"/>

        <androidx.appcompat.widget.AppCompatTextView
            style="@style/default_text_style_300"
            android:id="@+id/date_time"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginStart="10dp"
            android:layout_marginEnd="10dp"
            android:text="@{viewModel.dateTime, default=`envoyé le 02/05/2023 à 11h05`}"
            android:textSize="12sp"
            android:textColor="@color/gray_main2_500"
            android:maxLines="1"
            android:ellipsize="end"
            app:layout_constraintTop_toBottomOf="@id/file_name"
            app:layout_constraintBottom_toBottomOf="@id/back"
            app:layout_constraintEnd_toStartOf="@id/share"
            app:layout_constraintStart_toEndOf="@id/back"/>

        <ImageView
            android:id="@+id/share"
            android:onClick="@{shareClickListener}"
            android:layout_width="wrap_content"
            android:layout_height="@dimen/top_bar_height"
            android:adjustViewBounds="true"
            android:padding="15dp"
            android:src="@drawable/share_network"
            android:contentDescription="@string/content_description_share_file"
            android:background="@drawable/circle_transparent_button_background"
            android:visibility="@{viewModel.fullScreenMode || viewModel.isFromEphemeralMessage ? View.GONE : View.VISIBLE}"
            app:tint="@color/gray_main2_500"
            app:layout_constraintEnd_toStartOf="@id/save"
            app:layout_constraintTop_toTopOf="parent" />

        <ImageView
            android:id="@+id/save"
            android:onClick="@{() -> viewModel.exportToMediaStore()}"
            android:layout_width="wrap_content"
            android:layout_height="@dimen/top_bar_height"
            android:adjustViewBounds="true"
            android:padding="15dp"
            android:src="@drawable/download_simple"
            android:contentDescription="@string/content_description_save_file"
            android:background="@drawable/circle_transparent_button_background"
            android:visibility="@{viewModel.fullScreenMode || viewModel.isFromEphemeralMessage ? View.GONE : View.VISIBLE}"
            app:tint="@color/gray_main2_500"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintTop_toTopOf="parent" />

        <LinearLayout
            android:id="@+id/toasts_area"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            android:layout_marginTop="@dimen/toast_top_margin"
            android:layout_marginStart="15dp"
            android:layout_marginEnd="15dp"
            app:layout_constraintWidth_max="@dimen/toast_max_width"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintEnd_toEndOf="parent" />

    </androidx.constraintlayout.widget.ConstraintLayout>

</layout>