chinwag-android/app/src/main/res/layout/activity_compose.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/activity_compose"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">
        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:elevation="4dp"
            android:layout_marginBottom="16dp"
            android:theme="@style/AppTheme.Account.AppBarLayout"
            app:popupTheme="@style/AppTheme.Account.ToolbarPopupTheme.Dark"
            android:background="?attr/toolbar_background_color" />

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/compose_content_warning_bar"
            android:paddingTop="0dp"
            android:paddingLeft="16dp"
            android:paddingRight="16dp"
            android:layout_marginBottom="4dp">
            <android.support.design.widget.TextInputLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content">
                <EditText
                    android:id="@+id/field_content_warning"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:ems="10"
                    android:hint="@string/hint_content_warning"
                    android:inputType="text" />
            </android.support.design.widget.TextInputLayout>

        </LinearLayout>

        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1"
            android:paddingLeft="16dp"
            android:paddingRight="16dp"
            android:paddingBottom="16dp"
            android:id="@+id/compose_edit_area">

            <!--An special EditText is created at runtime here, because it has to be a modified
             * anonymous class to support image/GIF picking from the soft keyboard.-->

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="horizontal"
                android:id="@+id/compose_media_preview_bar"
                android:layout_alignParentBottom="true">

                <!--This is filled at runtime with ImageView's for each preview in the upload queue.-->

            </LinearLayout>

        </RelativeLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:paddingTop="4dp"
            android:paddingLeft="16dp"
            android:paddingBottom="16dp"
            android:layout_height="wrap_content">

            <TextView
                android:id="@+id/characters_left"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textColor="?android:textColorPrimary"
                android:text="500" />
        </LinearLayout>
    </LinearLayout>

    <android.support.design.widget.FloatingActionButton
        android:id="@+id/floating_btn"
        android:layout_width="wrap_content"
        android:layout_gravity="bottom|end"
        android:layout_margin="16dp"
        android:layout_height="wrap_content"
        app:srcCompat="@drawable/ic_send_24dp"/>

</android.support.design.widget.CoordinatorLayout>