Thanks for that Kostya I have come across a bit of a problem though.
After a scan there are 11 AP's found and all 11 show up in the list in the Wifi settings on the device. But when I use getConfiguredNetworks<http://developer.android.com/reference/android/net/wifi/WifiManager.html#getConfiguredNetworks>() it only returns 4 configured networks. This happens despite the 11 AP's showing up in the settings after a scan. So the majority of the time when I compared the AP with the best signal's SSID with the SSID's in the Configured Network list the majority of the time no matching SSID is found. In that case I try to add a new network but this ends up creating duplicates of the AP in the settings list. On Thu, May 13, 2010 at 5:24 PM, Kostya Vasilyev <kmans...@gmail.com> wrote: > Hi, > > 1. Regarding duplicates. Android maintains a list of "known" networks - for > each, it stores the SSID, encryption configuration, along with the password, > if necessary. Each known network also has a unique numeric ID. > > You can only connect to networks on this "known" list, because, as you > correctly figured out, connecting to a network is done by its id. > > However, it's not necessary to add the network to this list if it's already > been added (by Android or by your application). > > You can get the list of known networks from the WifiManager: > > > http://developer.android.com/reference/android/net/wifi/WifiManager.html#getConfiguredNetworks > () > > You can match these networks to your live scan results using their SSIDs. > If the network is already in the known list, just use its numeric id. If > not, you get the numeric ID back from addNetwork(). > > 2. Once you have the numeric ID, call enableNetwork(networkId, true) to > connect. The second parameter means "disconnect from others", not "forget > all other network" as its name might seem to imply. > > -- Kostya Vasilyev > > > 2010/5/13 draf...@gmail.com <draf...@gmail.com> > >> I am currently trying to write a class in Android that will Scan for >> access points, calculate which access point has the best signal and >> then connect to that access point. >> >> >> So the application will be able to scan on the move and attach to new >> access points on the go. >> >> I have the scanning and calculation of the best signal working. >> >> But when it comes to attaching to the best access point I am having >> trouble. >> >> It appears that enableNetwork(netid, othersTrueFalse) is the only >> method for attaching to an Access point but this causes problems as >> from my Scan Results I am not able to get the id of the access point >> with the strongest signal. >> >> This is my code: >> >> --- >> >> public void doWifiScan(){ >> >> scanTask = new TimerTask() { >> public void run() { >> handler.post(new Runnable() { >> public void run() { >> sResults = wifiManager.scan(getBaseContext()); >> if(sResults!=null) >> Log.d("TIMER", "sResults count" + sResults.size()); >> ScanResult scan = >> wifiManager.calculateBestAP(sResults); >> wifiManager.addNewAccessPoint(scan); >> } >> }); >> }}; >> >> t.schedule(scanTask, 3000, 30000); >> } >> >> >> --- >> >> public ScanResult calculateBestAP(List<ScanResult> sResults){ >> >> ScanResult bestSignal = null; >> for (ScanResult result : sResults) { >> if (bestSignal == null >> || >> WifiManager.compareSignalLevel(bestSignal.level, >> result.level) < 0) >> bestSignal = result; >> } >> >> String message = String.format("%s networks found. %s >> is the >> strongest. %s is the bsid", >> sResults.size(), bestSignal.SSID, >> bestSignal.BSSID); >> >> Log.d("sResult", message); >> return bestSignal; >> } >> >> >> --- >> >> public void addNewAccessPoint(ScanResult scanResult){ >> >> WifiConfiguration wc = new WifiConfiguration(); >> wc.SSID = '\"' + scanResult.SSID + '\"'; >> //wc.preSharedKey = "\"password\""; >> wc.hiddenSSID = true; >> wc.status = WifiConfiguration.Status.ENABLED; >> >> wc.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.TKIP); >> >> wc.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.CCMP); >> >> wc.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.WPA_PSK); >> >> wc.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.TKIP); >> >> wc.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.CCMP); >> wc.allowedProtocols.set(WifiConfiguration.Protocol.RSN); >> int res = mainWifi.addNetwork(wc); >> Log.d("WifiPreference", "add Network returned " + res ); >> boolean b = mainWifi.enableNetwork(res, false); >> Log.d("WifiPreference", "enableNetwork returned " + b ); >> >> } >> >> >> --- >> >> When I try to use addNewAccessPoint(ScanResult scanResult) it just >> adds another AP to the list in the settings application with the same >> name as the one with the best signal, so I end up with loads of >> duplicates and not actually attaching to them. >> >> Can anyone point me in the direction of a better solution? >> >> -- >> You received this message because you are subscribed to the Google >> Groups "Android Developers" group. >> To post to this group, send email to android-developers@googlegroups.com >> To unsubscribe from this group, send email to >> android-developers+unsubscr...@googlegroups.com<android-developers%2bunsubscr...@googlegroups.com> >> For more options, visit this group at >> http://groups.google.com/group/android-developers?hl=en > > > -- > You received this message because you are subscribed to the Google > Groups "Android Developers" group. > To post to this group, send email to android-developers@googlegroups.com > To unsubscribe from this group, send email to > android-developers+unsubscr...@googlegroups.com<android-developers%2bunsubscr...@googlegroups.com> > For more options, visit this group at > http://groups.google.com/group/android-developers?hl=en -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
