/frameworks/base/core/res/res/values/config.xml     0:3buttonmode(back,home,overviewbuttons)     1:2buttonmode(back,homebuttons+swipeupforoverview)     2:gesturesonlyforback,homeandoverview-->默认0：  0/device/mediatek/system/common/system.prop #temporaryenablesNAVbar(softkeys)虚拟键宏开关  0：开启 1：关闭qemu.hw.