wm命令可以用于获取屏幕分辨率、像素密度等。 前提：Android4.3及以上
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.获取屏幕尺寸：
adb shell wm size新闻热点
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