[Sony Cross-Device Development Themes and Apps] kin201303:
i hide the stock nav_buttons

navigation_layout.xml

xmlns:android="http://schemas.android.com/apk/res/android" xmlns:systemui="http://schemas.android.com/apk/res-auto">

<com.tomatolei.systemui.statusbar.navbuttonsbg.CustomBg android:layout_width="fill_parent" android:layout_height="fill_parent" />

<HorizontalScrollView android:background="#00000000" android:scrollbars="none" android:layout_width="fill_parent" android:layout_height="wrap_content">

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

<FrameLayout android:id="@id/nav_buttons" android:layout_width="0.0dip" android:layout_height="0.0dip">

<LinearLayout android:orientation="horizontal" android:id="@id/ends_group" android:clipChildren="false" android:layout_width="fill_parent" android:layout_height="fill_parent" />

<LinearLayout android:gravity="center" android:orientation="horizontal" android:id="@id/center_group" android:background="#000000fa" android:clipChildren="false" android:layout_width="fill_parent" android:layout_height="fill_parent" />

<LinearLayout android:gravity="center" android:orientation="horizontal" android:id="@id/nav_bar_widget" android:clipChildren="false" android:layout_width="fill_parent" android:layout_height="fill_parent" />

</FrameLayout>

<com.android.systemui.statusbar.policy.KeyButtonView android:id="@id/CocoyayaCalendar" android:layout_width="50.0dip" android:layout_height="35.0dip" android:src="@drawable/cocoyaya_calendar" android:scaleType="center" android:layout_weight="0.0" android:layout_marginStart="0.0dip" android:layout_marginEnd="25.0dip" systemui:keyCode="208" />

<com.android.systemui.statusbar.policy.KeyButtonView android:id="@id/CocoyayaContacts" android:layout_width="50.0dip" android:layout_height="35.0dip" android:src="@drawable/cocoyaya_contacts" android:scaleType="center" android:layout_weight="0.0" android:layout_marginEnd="25.0dip" systemui:keyCode="207" />

<com.android.systemui.statusbar.policy.KeyButtonView android:id="@id/CocoyayaHome" android:layout_width="60.0dip" android:layout_height="35.0dip" android:src="@drawable/cocoyaya_home" android:scaleType="center" android:layout_weight="0.0" android:layout_marginEnd="25.0dip" systemui:keyCode="3" />

<com.android.systemui.statusbar.policy.KeyButtonView android:id="@id/CocoyayaCamera" android:layout_width="50.0dip" android:layout_height="35.0dip" android:src="@drawable/cocoyaya_camera" android:scaleType="center" android:layout_weight="0.0" android:layout_marginEnd="25.0dip" systemui:keyCode="27" />

<com.android.systemui.statusbar.policy.KeyButtonView android:id="@id/CocoyayaBrowser" android:layout_width="50.0dip" android:layout_height="35.0dip" android:src="@drawable/cocoyaya_browse" android:scaleType="center" android:layout_weight="0.0" android:layout_marginEnd="25.0dip" systemui:keyCode="64" />

<com.android.systemui.statusbar.policy.KeyButtonView android:id="@id/CocoyayaPower" android:layout_width="50.0dip" android:layout_height="35.0dip" android:src="@drawable/cocoyaya_power" android:scaleType="center" android:layout_weight="0.0" android:layout_marginEnd="25.0dip" systemui:keyCode="26" />

<com.android.systemui.statusbar.policy.KeyButtonView android:id="@id/CocoyayaStop" android:layout_width="50.0dip" android:layout_height="35.0dip" android:src="@drawable/cocoyaya_stop" android:scaleType="center" android:layout_weight="0.0" android:layout_marginEnd="25.0dip" systemui:keyCode="86" />

<com.android.systemui.statusbar.policy.KeyButtonView android:id="@id/CocoyayaBackTrack" android:layout_width="50.0dip" android:layout_height="35.0dip" android:src="@drawable/cocoyaya_playback" android:scaleType="center" android:layout_weight="0.0" android:layout_marginEnd="25.0dip" systemui:keyCode="88" />

<com.android.systemui.statusbar.policy.KeyButtonView android:id="@id/CocoyayaPlayPause" android:layout_width="50.0dip" android:layout_height="35.0dip" android:src="@drawable/cocoyaya_play" android:scaleType="center" android:layout_weight="0.0" android:layout_marginEnd="25.0dip" systemui:keyCode="85" />

<com.android.systemui.statusbar.policy.KeyButtonView android:id="@id/CocoyayaForwardTrack" android:layout_width="50.0dip" android:layout_height="35.0dip" android:src="@drawable/cocoyaya_forward" android:scaleType="center" android:layout_weight="0.0" android:layout_marginEnd="5.0dip" systemui:keyCode="87" />

</LinearLayout>

</HorizontalScrollView>

<com.android.systemui.statusbar.policy.DeadZone android:layout_gravity="top" android:id="@id/deadzone" android:layout_width="fill_parent" android:layout_height="fill_parent" systemui:minSize="@dimen/navigation_bar_deadzone_size" systemui:maxSize="@dimen/navigation_bar_deadzone_size_max" systemui:holdTime="@integer/navigation_bar_deadzone_hold" systemui:decayTime="@integer/navigation_bar_deadzone_decay" systemui:orientation="horizontal" />

</FrameLayout>