jonathan.xml

 <RelativeLayout
        android:layout_width="wrap_content"
        android:layout_height="50dp"
        android:layout_alignParentBottom="true"
        android:background="@color/colorPrimaryDark">
        <LinearLayout
            android:id="@+id/wrapper"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:weightSum="1.0"
            android:layout_centerInParent="true"
            android:gravity="center_vertical"
            >

            <LinearLayout
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="0.25"
                android:gravity="center"
                android:weightSum="1.0">

                <Button
                    android:id="@+id/save_button"
                    android:layout_width="0dp"
                    android:layout_height="30dp"

                    android:layout_weight="0.25"
                    android:background="@drawable/avataaar"
                    android:textColor="@color/white" />
            </LinearLayout>
        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:weightSum="1.0"
            android:gravity="center"
            android:layout_weight="0.25"
            >
        <Button
            android:id="@+id/save_button2"
            android:layout_width="0dp"
            android:layout_weight="0.25"
            android:layout_height="30dp"
            android:onClick="onSubmitClick"
            android:background="@drawable/avataaar"
            android:textColor="@color/white" /></LinearLayout>
        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:weightSum="1.0"
            android:gravity="center"
            android:layout_weight="0.25"
            >
        <Button
            android:id="@+id/save_button3"
            android:layout_width="0dp"
            android:layout_weight="0.25"
            android:layout_height="30dp"
            android:onClick="onSubmitClick"
            android:background="@drawable/avataaar"
            android:textColor="@color/white" /></LinearLayout>
        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:weightSum="1.0"
            android:gravity="center"
            android:layout_weight="0.25"
            >
        <Button
            android:id="@+id/save_button4"
            android:layout_width="0dp"
            android:layout_weight="0.25"
            android:layout_height="30dp"
            android:onClick="onSubmitClick"
            android:background="@drawable/avataaar"
            android:textColor="@color/white" />
        </LinearLayout></LinearLayout>
    </RelativeLayout>