Android Navigation Bar on side by editing AOSP

Question

I want to put the Navigation Bar (has system soft keys like back, home and menu. not Navigation Drawer!) on the (right) side, like below, by editing AOSP.

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Answer 1

Navigation Bar can be placed on right side by editing PhoneWindowManager.java and navigation_bar.xml.

Set mNavigationBarOnBottom to false in PhoneWindowManager then the following code will run.

// PhoneWindowManager.java
// if mNavigationBarOnBottom = false
// Landscape screen; nav bar goes to the right
int left = displayWidth - mNavigationBarWidthForRotation[displayRotation];
mTmpNavigationFrame.set(left, 0, displayWidth, displayHeight);
mStableRight = mStableFullscreenRight = mTmpNavigationFrame.left;
if (navVisible) {
    mNavigationBar.showLw(true);
    mDockRight = mTmpNavigationFrame.left;
    mRestrictedScreenWidth = mDockRight - mDockLeft;
} else {
    // We currently want to hide the navigation UI.
    mNavigationBar.hideLw(true);
}
if (navVisible && !mNavigationBar.isAnimatingLw()) {
    // If the nav bar is currently requested to be visible,
    // and not in the process of animating on or off, then
    // we can tell the app that it is covered by it.
    mSystemRight = mTmpNavigationFrame.left;
}

This creates the frame for navigation bar on right instead of bottom, now layout needs to be edited to display system buttons vertically(navigation_bar.xml).

<!--  navigation bar for sw600dp (small tablets) -->
<com.android.systemui.statusbar.phone.NavigationBarView
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:systemui="http://schemas.android.com/apk/res/com.android.systemui"
    android:layout_height="match_parent"
    android:layout_width="match_parent"
    android:background="#FF000000"
    >    
    <FrameLayout android:id="@+id/rot0"
        android:layout_height="match_parent"
        android:layout_width="match_parent"
        >    
        <LinearLayout
            android:layout_height="match_parent"
            android:layout_width="match_parent"
            android:orientation="vertical"
            android:clipChildren="false"
            android:clipToPadding="false"
            android:id="@+id/nav_buttons"
            android:animateLayoutChanges="true"
            >    
            <!-- navigation controls -->
            ~
            <com.android.systemui.statusbar.policy.KeyButtonView android:id="@+id/back"
                android:layout_width="match_parent"
                android:layout_height="128dp"
                android:src="@drawable/ic_sysbar_back"
                systemui:keyCode="4"
                android:layout_weight="0"
                systemui:glowBackground="@drawable/ic_sysbar_highlight"
                android:contentDescription="@string/accessibility_back"
                />
            ~
        </LinearLayout>
    </FrameLayout>
</com.android.systemui.statusbar.phone.NavigationBarView>