Quelle  activity_call.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/call_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/gallery_background">

    <!-- Background image (for audio calls) -->
    <ImageView
        android:id="@+id/background_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:scaleType="centerCrop"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        tools:ignore="ContentDescription" />

    <!-- Video surfaces -->
    <!-- Gradient on top of fullscreen renderer for better readability -->
    <org.webrtc.SurfaceViewRenderer
        android:id="@+id/fullscreen_video_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:visibility="gone"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <View
        android:id="@+id/fullscreen_video_view_gradient"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@drawable/call_background_gradient"
        android:visibility="visible"
        app:layout_constraintBottom_toBottomOf="@id/fullscreen_video_view"
        app:layout_constraintEnd_toEndOf="@id/fullscreen_video_view"
        app:layout_constraintStart_toStartOf="@id/fullscreen_video_view"
        app:layout_constraintTop_toTopOf="@id/fullscreen_video_view" />

    <androidx.constraintlayout.widget.ConstraintLayout
        android:id="@+id/content_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <org.webrtc.SurfaceViewRenderer
            android:id="@+id/pip_video_view"
            android:layout_width="0dp"
            android:layout_height="0dp"
            android:layout_margin="@dimen/call_activity_margin"
            android:visibility="gone"
            app:layout_constraintBottom_toTopOf="@+id/incall_buttons_container"
            app:layout_constraintDimensionRatio="H,3:4"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintWidth_default="percent"
            app:layout_constraintWidth_percent=".25" />

        <!-- Debug info -->
        <TextView
            android:id="@+id/call_debug_info"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_margin="@dimen/call_activity_margin"
            android:background="@color/material_grey_300_alpha"
            android:textColor="#ffffff"
            android:textSize="11sp"
            android:visibility="gone"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintTop_toBottomOf="@id/caller_container"
            tools:ignore="SmallSp" />

        <!-- Caller info plus camera switches -->
        <androidx.constraintlayout.widget.ConstraintLayout
            android:id="@+id/caller_container"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginLeft="@dimen/call_activity_margin"
            android:layout_marginTop="@dimen/grid_unit_x1"
            android:layout_marginRight="0dp"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintTop_toTopOf="parent">

            <!-- Name -->
            <ch.threema.app.emojis.EmojiTextView
                android:id="@+id/call_contact_name"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="@dimen/caller_container_margin_top"
                android:ellipsize="end"
                android:fontFamily="sans-serif-light"
                android:textColor="#ffffff"
                android:textSize="32sp"
                app:layout_constrainedWidth="true"
                app:layout_constraintHorizontal_bias="0"
                app:layout_constraintHorizontal_chainStyle="packed"
                app:layout_constraintLeft_toLeftOf="parent"
                app:layout_constraintRight_toLeftOf="@+id/button_call_switch_cam"
                app:layout_constraintTop_toTopOf="parent"
                tools:text="Firstname Lastname" />

            <!-- Verification dots -->
            <ImageView
                android:id="@+id/call_contact_dots"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="1dp"
                android:layout_marginTop="8dp"
                app:layout_constraintLeft_toLeftOf="parent"
                app:layout_constraintTop_toBottomOf="@id/call_contact_name"
                tools:ignore="ContentDescription" />

            <!-- Call status -->
            <ch.threema.app.ui.AnimatedEllipsisTextView
                android:id="@+id/call_status"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_marginTop="8dp"
                android:ellipsize="none"
                android:fontFamily="sans-serif-light"
                android:textColor="#ffffff"
                android:textSize="24sp"
                app:layout_constrainedWidth="true"
                app:layout_constraintLeft_toLeftOf="parent"
                app:layout_constraintTop_toBottomOf="@id/call_contact_dots" />

            <!-- Call duration counter -->
            <Chronometer
                android:id="@+id/call_duration"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_marginTop="8dp"
                android:fontFamily="sans-serif-light"
                android:textColor="#ffffff"
                android:textSize="24sp"
                app:layout_constrainedWidth="true"
                app:layout_constraintLeft_toLeftOf="parent"
                app:layout_constraintTop_toBottomOf="@id/call_contact_dots" />

            <!-- video toggle -->
            <ImageView
                android:id="@+id/button_call_toggle_video"
                android:layout_width="@dimen/call_activity_small_button_size"
                android:layout_height="@dimen/call_activity_small_button_size"
                android:layout_marginTop="@dimen/call_video_button_margin_top"
                android:background="@drawable/ripple_call_button"
                android:clickable="true"
                android:contentDescription="@string/voip_toggle_video"
                android:focusable="true"
                android:scaleType="center"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintTop_toTopOf="parent"
                app:srcCompat="@drawable/ic_videocam_off_black_outline"
                app:tint="@android:color/white" />

            <ImageView
                android:id="@+id/button_call_switch_cam"
                android:layout_width="@dimen/call_activity_small_button_size"
                android:layout_height="@dimen/call_activity_small_button_size"
                android:layout_marginTop="@dimen/call_video_button_margin_top"
                android:background="@drawable/ripple_call_button"
                android:clickable="true"
                android:contentDescription="@string/voip_switch_cam"
                android:focusable="true"
                android:scaleType="center"
                android:visibility="gone"
                app:layout_constraintEnd_toStartOf="@+id/button_call_toggle_video"
                app:layout_constraintTop_toTopOf="parent"
                app:srcCompat="@drawable/ic_flip_camera_android"
                app:tint="@android:color/white" />

        </androidx.constraintlayout.widget.ConstraintLayout>

        <!-- Incoming call buttons -->
        <FrameLayout
            android:id="@+id/incoming_call_buttons_container"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginLeft="32dp"
            android:layout_marginRight="32dp"
            android:layout_marginBottom="@dimen/incoming_call_slider_margin_bottom"
            android:gravity="center_horizontal"
            app:layout_constraintBottom_toTopOf="@id/incall_buttons_container"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintWidth_max="300dp">

            <FrameLayout
                android:id="@+id/buttons_incoming_call_container"
                android:layout_width="match_parent"
                android:layout_height="@dimen/incoming_call_slider_height"
                android:gravity="center_horizontal"
                android:visibility="gone">

                <ch.threema.app.voip.CallAnswerIndicatorLayout
                    android:id="@+id/buttons_incoming_call_slider_container"
                    android:layout_width="match_parent"
                    android:layout_height="@dimen/incoming_call_slider_height"
                    android:gravity="center_vertical"
                    android:visibility="visible" />

                <ImageView
                    android:id="@+id/button_incoming_call"
                    android:layout_width="@dimen/incoming_call_widget_circle_size"
                    android:layout_height="@dimen/incoming_call_widget_circle_size"
                    android:layout_gravity="center"
                    android:background="@drawable/ic_circle_white"
                    android:clickable="true"
                    android:foreground="@drawable/selector_avatar"
                    android:scaleType="center"
                    app:srcCompat="@drawable/ic_ring_volume_outline"
                    app:tint="@color/material_blue" />
            </FrameLayout>

            <FrameLayout
                android:id="@+id/accessibility_layout"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_gravity="bottom"
                android:visibility="gone">

                <ImageView
                    android:id="@+id/accessibility_decline"
                    android:layout_width="@dimen/incoming_call_widget_circle_size"
                    android:layout_height="@dimen/incoming_call_widget_circle_size"
                    android:layout_gravity="center_vertical|left"
                    android:background="@drawable/ic_circle_lockscreen_red"
                    android:clickable="true"
                    android:contentDescription="@string/voip_reject"
                    android:focusable="true"
                    android:foreground="@drawable/selector_avatar"
                    android:scaleType="center"
                    app:srcCompat="@drawable/ic_call_end_outline"
                    app:tint="@android:color/white" />

                <ImageView
                    android:id="@+id/accessibility_answer"
                    android:layout_width="@dimen/incoming_call_widget_circle_size"
                    android:layout_height="@dimen/incoming_call_widget_circle_size"
                    android:layout_gravity="center_vertical|right"
                    android:background="@drawable/ic_circle_lockscreen_green"
                    android:clickable="true"
                    android:contentDescription="@string/voip_accept"
                    android:focusable="true"
                    android:foreground="@drawable/selector_avatar"
                    android:scaleType="center"
                    app:srcCompat="@drawable/ic_phone_locked_outline"
                    app:tint="@android:color/white" />
            </FrameLayout>

        </FrameLayout>

        <androidx.constraintlayout.widget.ConstraintLayout
            android:id="@+id/incall_buttons_container"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="@dimen/call_activity_margin"
            android:layout_marginBottom="@dimen/call_activity_margin"
            app:layout_constraintBottom_toBottomOf="parent">

            <!-- Bottom buttons -->

            <ImageView
                android:id="@+id/button_picture_in_picture"
                android:layout_width="@dimen/call_activity_small_button_size"
                android:layout_height="@dimen/call_activity_small_button_size"
                android:background="@drawable/ripple_call_button"
                android:clickable="true"
                android:contentDescription="@string/enable_picture_in_picture"
                android:focusable="true"
                android:scaleType="center"
                android:visibility="gone"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintLeft_toLeftOf="parent"
                app:layout_constraintTop_toTopOf="parent"
                app:srcCompat="@drawable/ic_picture_in_picture"
                app:tint="@android:color/white" />

            <ImageView
                android:id="@+id/button_call_disconnect"
                android:layout_width="@dimen/call_activity_small_button_size"
                android:layout_height="@dimen/call_activity_small_button_size"
                android:background="@drawable/ic_circle_lockscreen_red"
                android:clickable="true"
                android:contentDescription="@string/voip_hangup"
                android:focusable="true"
                android:foreground="@drawable/selector_avatar"
                android:scaleType="center"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toStartOf="parent"
                app:srcCompat="@drawable/ic_call_end_outline"
                app:tint="@android:color/white" />

            <ch.threema.app.voip.AudioSelectorButton
                android:id="@+id/button_call_toggle_audio_source"
                android:layout_width="@dimen/call_activity_small_button_size"
                android:layout_height="@dimen/call_activity_small_button_size"
                android:layout_marginLeft="12dp"
                android:background="@drawable/ic_compound_audio_source_24dp"
                android:clickable="true"
                android:contentDescription="@string/voip_toggle_speaker"
                android:focusable="true"
                android:scaleType="center"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintStart_toEndOf="@+id/button_call_disconnect" />

            <ImageView
                android:id="@+id/button_call_toggle_mic"
                android:layout_width="@dimen/call_activity_small_button_size"
                android:layout_height="@dimen/call_activity_small_button_size"
                android:layout_marginRight="12dp"
                android:background="@drawable/ripple_call_button"
                android:clickable="true"
                android:contentDescription="@string/voip_toggle_mic"
                android:focusable="true"
                android:scaleType="center"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintEnd_toStartOf="@+id/button_call_disconnect"
                app:srcCompat="@drawable/ic_keyboard_voice_outline"
                app:tint="@android:color/white" />

        </androidx.constraintlayout.widget.ConstraintLayout>

    </androidx.constraintlayout.widget.ConstraintLayout>

    <FrameLayout
        android:id="@+id/interrupt_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:background="#AA000000"
        android:gravity="center"
        android:padding="16dp"
        android:visibility="gone"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent">

        <TextView
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_gravity="center"
            android:gravity="center"
            android:text="@string/audio_mute_due_to_focus_loss"
            android:textAlignment="center"
            android:textColor="@android:color/white"
            android:textSize="24sp" />

    </FrameLayout>

</androidx.constraintlayout.widget.ConstraintLayout>