activity_grid_editing.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
                xmlns:tools="http://schemas.android.com/tools"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                tools:context="com.godoro.androideditors.GridEditingActivity">

    <ListView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:longClickable="true"
        android:clickable="true"

        android:id="@+id/editingListView"
        android:layout_centerHorizontal="true"
        android:layout_alignParentTop="true"
        android:layout_above="@+id/saveButton"/>

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/save"
        android:id="@+id/saveButton"
        android:onClick="onSaveClick"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"/>
</RelativeLayout>