<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

    <LinearLayout
        android:id="@+id/canvasLayout"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_above="@+id/btnLayout"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:orientation="vertical" >

    </LinearLayout>

    <LinearLayout
        android:id="@+id/btnLayout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:padding="@dimen/padding_small"
        android:background="@color/tv_white"
        android:layout_alignParentBottom="true"
        android:layout_alignParentRight="true"
        android:weightSum="1"
        android:gravity="right" >

        <Button
            android:id="@+id/btnEdit"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="0.25"
            android:background="@drawable/button_background"
            android:drawableLeft="@drawable/icon_edit_32"/>

        <Button
            android:id="@+id/btnErase"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="0.25"
            android:background="@drawable/button_background"
            android:drawableLeft="@drawable/icon_erase_32"/>

        <Button
            android:id="@+id/btnClear"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="0.25"
            android:background="@drawable/button_background"
            android:drawableLeft="@drawable/icon_clear_32" />

        <Button
            android:id="@+id/btnSave"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="0.25"
            android:background="@drawable/button_background"
            android:drawableLeft="@drawable/icon_check_32" />
    </LinearLayout>

</RelativeLayout>