session-android/res/layout/recording_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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/recording_container"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_gravity="center_vertical"
    android:gravity="center_vertical"
    android:orientation="horizontal"
    tools:visibility="visible"
    tools:showIn="@layout/conversation_input_panel">

    <ImageView
        android:id="@+id/microphone"
        android:layout_width="24dp"
        android:layout_height="24dp"
        android:layout_marginStart="14dp"
        android:importantForAccessibility="no"
        android:tint="@color/destructive"
        android:visibility="invisible"
        android:scaleType="centerInside"
        app:srcCompat="@drawable/ic_microphone"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        tools:visibility="visible" />

    <TextView
        android:id="@+id/record_time"
        style="@style/Signal.Text.Body"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="4dp"
        android:ellipsize="none"
        android:singleLine="true"
        android:textColor="#99FFFFFF"
        android:visibility="gone"
        android:textSize="@dimen/small_font_size"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toEndOf="@id/microphone"
        app:layout_constraintTop_toTopOf="parent"
        tools:text="00:00"
        tools:visibility="visible" />

    <TextView
        android:id="@+id/record_cancel"
        style="@style/Signal.Text.Caption"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginEnd="@dimen/medium_spacing"
        android:ellipsize="none"
        android:gravity="center_vertical"
        android:padding="4dp"
        android:text="@string/conversation_input_panel__cancel"
        android:textSize="@dimen/small_font_size"
        android:textColor="@color/destructive"
        android:visibility="gone"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        tools:visibility="visible" />

    <FrameLayout
        android:id="@+id/frameLayout"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:clipChildren="true"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toEndOf="@+id/record_time"
        app:layout_constraintTop_toTopOf="parent">

        <LinearLayout
            android:id="@+id/slide_to_cancel"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            android:gravity="center_vertical"
            android:visibility="gone"
            tools:visibility="visible">

            <ImageView
                android:layout_width="24dp"
                android:layout_height="24dp"
                android:layout_marginTop="1dp"
                android:src="@drawable/ic_keyboard_arrow_left_grey600_24dp"
                android:tint="#99FFFFFF"
                android:scaleType="centerInside" />

            <TextView
                style="@style/Signal.Text.Caption"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textSize="@dimen/small_font_size"
                android:ellipsize="none"
                android:text="@string/conversation_input_panel__slide_to_cancel"
                android:textColor="#99FFFFFF" />

        </LinearLayout>

    </FrameLayout>

</android.support.constraint.ConstraintLayout>