Size recyclerview correctly.

        <android.support.v7.widget.RecyclerView

            android:id="@+id/preview_content"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:layout_width="match_parent"

            android:layout_height="match_parent"

            android:clipToPadding="false"

            android:orientation="vertical">

        </android.support.v7.widget.RecyclerView>