//打开微信扫一扫界面
sit(a,"action", "android.intent.action.VIEW")
sit(a, "classname", "com.tencent.mm", "com.tencent.mm.ui.LauncherUI")
sit(a,"extra","LauncherUI.From.Scaner.Shortcut", true)
sit(a, "flags", "335544320") 
uit(a, "chooser", "微信扫一扫")
//以上为潇洒的夏夏原创，转载请注明！