sit(a, "action", "android.intent.action.SEND")
sit(a, "type", "text/plain")
sit(a, "extra", "android.intent.extra.SUBJECT", "分享软件")
sit(a, "extra", "android.intent.extra.TEXT", "输入内容'')
sit(a, "flags", 268435456)
uit(a, "chooser", "分享")