机器人，无线主动扫描 [英] Android, wifi active scans

问题描述

我需要在我的Andr​​oid应用频繁的无线扫描（我试图建立一个基于wifi的RSSI值本地的室内定位系统）。如果我叫wifi.startScan（）我已经的onReceive（）叫回来，每6秒一次（我想在默认情况下它的扫描被动）：我如何才能更频繁的回调？我应该向主动扫描？它是如何做？有什么缺点？

I need a frequent wifi scan on my android application (I'm trying to build a local indoor positioning system based on wifi RSSI values). IF I call wifi.startScan() I have onReceive() called back once every 6 seconds (I suppose by default it's scanning passively): how do I get more frequent callbacks? Should I ask for "active" scans? How is it done? Are there any drawbacks?

推荐答案

我不认为你可以。它是一个设备和/或操作系统的版本dependend设置。在Nexus One上，例如它需要大约一秒钟扫描，而在G1上花费显著长（或经过几次扫描得到新鲜的结果）。如果我没有记错，一些Android版本（小于2.0）并没有发出新的扫描，每次 startScan（）被称为，但有可能重新使用旧的结果。但我可能是错误的那一个。

I don't think you can. It is a device and/or OS version dependend setting. On the Nexus One for example it takes roughly a second to scan whereas on the G1 it takes significantly longer (or get fresh results after a few scans). If I recall correctly, some Android Version (< 2.0) did not issue a fresh scan everytime startScan() was called but might have reused the old result. But I might be mistaken on that one.

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