frame_sliding_panel.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.NestedScrollView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:background="?attr/colorBackgroundCard"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:animateLayoutChanges="true"
            android:orientation="horizontal">

            <ScrollView
                android:id="@+id/chatlineScroller"
                android:layout_width="0dip"
                android:layout_height="wrap_content"
                android:layout_weight="1">

                <android.support.v7.widget.AppCompatEditText
                    android:id="@+id/chatline"
                    android:layout_width="match_parent"
                    android:layout_height="?attr/actionBarSize"
                    android:background="@android:color/transparent"
                    android:gravity="top"
                    android:hint="@string/message_placeholder"
                    android:inputType="textCapSentences|textShortMessage|textAutoCorrect"
                    android:paddingBottom="17dp"
                    android:paddingLeft="20dp"
                    android:paddingRight="20dp"
                    android:paddingTop="17dp"
                    android:text="@string/large_text"
                    android:textSize="16sp" />

            </ScrollView>

            <android.support.v7.widget.AppCompatImageButton
                android:id="@+id/send"
                style="?attr/buttonStyleSmall"
                android:layout_width="56dp"
                android:layout_height="?attr/actionBarSize"
                android:layout_gravity="top"
                android:background="?attr/selectableItemBackgroundBorderless"
                android:padding="12dp"
                android:src="@drawable/ic_send"
                android:tint="?attr/colorAccent" />
        </LinearLayout>

        <android.support.v7.widget.RecyclerView
            android:id="@+id/msg_history"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />

    </LinearLayout>

</android.support.v4.widget.NestedScrollView>