session-android/app/src/main/res/layout/view_input_bar.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/inputBarLinearLayout"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:background="@color/input_bar_background">

    <View
        android:layout_width="match_parent"
        android:layout_height="1px"
        android:background="@color/separator" />

    <FrameLayout
        android:id="@+id/inputBarAdditionalContentContainer"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

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

        <RelativeLayout
            android:id="@+id/attachmentsButtonContainer"
            android:layout_width="@dimen/input_bar_button_expanded_size"
            android:layout_height="@dimen/input_bar_button_expanded_size"
            android:layout_alignParentStart="true"
            android:layout_centerVertical="true"
            android:layout_marginStart="@dimen/small_spacing" />

        <org.thoughtcrime.securesms.conversation.v2.input_bar.InputBarEditText
            android:id="@+id/inputBarEditText"
            android:layout_width="match_parent"
            android:layout_height="40dp"
            android:layout_centerInParent="true"
            android:layout_marginStart="64dp"
            android:layout_marginEnd="64dp"
            android:gravity="center_vertical"
            android:textColor="@color/text"
            android:textSize="@dimen/small_font_size"
            android:background="@null"
            android:hint="@string/ConversationActivity_message" />

        <RelativeLayout
            android:id="@+id/microphoneOrSendButtonContainer"
            android:layout_width="@dimen/input_bar_button_expanded_size"
            android:layout_height="@dimen/input_bar_button_expanded_size"
            android:layout_alignParentEnd="true"
            android:layout_centerVertical="true"
            android:layout_marginEnd="@dimen/small_spacing" />

    </RelativeLayout>

</LinearLayout>