找到framework/base/core/res/res/values/dimens.xml，在其中把Navigation的配置改成0

    <!-- Height of the bottom navigation / system bar. -->
    <dimen name="navigation_bar_height">0dp</dimen>
    <!-- Height of the bottom navigation bar in portrait; often the same as @dimen/navigation_bar_height -->
    <dimen name="navigation_bar_height_landscape">0dp</dimen>
因為這個改動只修改了framework的資原始檔，編譯核心，獲取framework-res.apk(./out/target/product/sabresd/system/framework/) , adb push到手機的/system/framework（在這個目錄下能看到原有的framework-res.apk），然後reboot，啟動發現沒有虛擬導航按鍵了.