Android wm help 帮助信息

wm help :

usage: wm [subcommand] [options]
       wm size [reset|WxH]
       wm density [reset|DENSITY]
       wm overscan [reset|LEFT,TOP,RIGHT,BOTTOM]
wm size: return or override display size.
wm density: override display density.
wm overscan: set overscan area for display.