Donal,
I think you are not matching the SSIDs of known and live networks correctly.
The SSIDs in the "known" list are enclosed in double quotes:
http://developer.android.com/reference/android/net/wifi/WifiConfiguration.html#SSID
The SSIDs in the live scan result list are "as is", without the quotes.
Your code needs to take this into consideration when matching the
networks between the two lists.
BTW, feel free to download and try my WiFi management tool, I think it
should make it easier to see what's going on. See the link in my
signature below.
--
Kostya Vasilyev ~ WiFi Manager + pretty widget ~
http://kmansoft.wordpress.com/sw
14.05.2010 14:33, Donal Rafferty ?????:
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 <[email protected]
<mailto:[email protected]>> 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 [email protected] <mailto:[email protected]>
<[email protected] <mailto:[email protected]>>
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?
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