B4A Library Wifi Library

[woniol]

I use API 21:
C:\Program Files (x86)\Android\android-sdk\platforms\android-21\android.jar

 

[alwaysbusy]

@woniol I've uploaded a version without the timestamp (2.01). I can't seem to find any particular reason why it does not work on your device. And TimeStamp is one of the lesser important properties.

 

[woniol]

Works fine now. Thank You.

 

[Firpas]

The "StartWifi" method of ABWifi 2.x fails when wifi is disable.
This is the error:

java.lang.RuntimeException: Error receiving broadcast Intent { act=android.net.wifi.WIFI_STATE_CHANGED flg=0x4000010 (has extras) } in com.AB.ABWifi.ABWifi$1@42228ef8

at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:782)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:146)
at android.app.ActivityThread.main(ActivityThread.java:5603)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at com.AB.ABWifi.ABWifi$1.onReceive(ABWifi.java:132)
at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:772)
... 9 more


And the manifest include this two lines:

AddPermission(android.permission.ACCESS_WIFI_STATE)
AddPermission(android.permission.CHANGE_WIFI_STATE)

Any idea???

Thanks in advance

 

[alwaysbusy]

Kind of a weird error. StartWifi should just return false in the lib when _wifi == null (causing the java.lang.NullPointerException error later in the BroadcastReceiver). I'll look into it.

Anyhow the two lines:
AddPermission(android.permission.ACCESS_WIFI_STATE)
AddPermission(android.permission.CHANGE_WIFI_STATE)

Should not be added as they are already added in the library

 

[Firpas]

Thanks for your quick reply.
I hope your news.

 

[alwaysbusy]

Here is a temporary new version. There is also a new demo project, as there were some changes (extra event). Check that one out first before trying it in your project. This is a hard one to debug as I'm connected via wifi to the device, and it's just that connection that must be disabled to reproduce the problem.

Changes (so far)

Sub Activity_Resume
' start ABWifi
If wifi.StartWifi() Then ' use the boolean to see if it's ready to do a GetNewReadingWifi(), if false, you'll have to wait for the WifiEnabled() event
' Get a reading
wifi.GetNewReadingWifi
End If
End Sub

' new
Sub wifi_WifiEnabled(IsEnabled As Boolean)
If IsEnabled Then
wifi.GetNewReadingWifi
Else
ToastMessageShow("Failed to enable Wifi", True)
End If
End Sub

 

[Firpas]

Once again thanks for your quick response.
I tried the new library and now produces a different error:

** Activity (scanwifi) Create, isFirst = true **
** Activity (scanwifi) Resume **
Get new reading
Enabled: true

java.lang.RuntimeException: Error receiving broadcast Intent { act=android.net.wifi.SCAN_RESULTS flg=0x4000010 } in com.AB.ABWifi.ABWifi$2@4222b850

at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:782)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:146)
at android.app.ActivityThread.main(ActivityThread.java:5603)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1283)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1099)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at com.AB.ABWifi.ABWifi$2.onReceive(ABWifi.java:236)
at android.app.LoadedApk$ReceiverDispatcher$Args.run(LoadedApk.java:772)
... 9 more

 

[Firpas]

One question ...
If I start a timer (10 sec) in the "_WifiEnabled" event, and then call "_GetNewReadingWifi", works well.

I hope this comment will help you.

Thanks for your cooperation again.

 

[Firpas]

One suggestion ...
It would be very useful to give the library a pair of methods to connect to a ABWifiReading:

ABWifiConnect (SSID as string) as boolean
ABWifiConnect2 (BSSID as string) as boolean

It's just a suggestion

 

[alwaysbusy]

Ok, another version. I'm afraid we are going to to some trial and error because I'm unable to reproduce the problem here on my devices.
Not having to use a timer is the reason I've started rewriting the lib, so using one is not a solution I'm afraid. It appears in the last version (2.02) it was now the var CurrConn that somehow became null just one line after it was checked:

Lib java code:

if (CurrConn != null) {
if (result.BSSID.compareTo(CurrConn.getBSSID) == 0) { <== null pointer exception
reading.IsConnected = true;
}
}

Added some more checks in this one:

if (CurrConn != null) {
String resBSSID = result.BSSID;
if (currBSSID!=null && resBSSID != null) {
if (resBSSID.compareTo(currBSSID) == 0) {
reading.IsConnected = true;
}
}
}

Can you also tell me the device and the Android version you are using?

I'm not going to add any more functionality until that nasty one is solved. Also, I believe connecting to a Wifi is already in another lib?

 

[Firpas]

Here is my devices and Androd version:

Tablets

Samsung Galaxy Tab 4 (GT-N8000) - Android 4.4.2
Asus Fonepad 7 (K013) - Android 4.4.2

Smartphones

Samsung Galalaxy S4 - Android 4.4.2
Samsung Galaxy Trend - Android 4.0.4
HTC WildFire - Androd 2.2.1

Now i'm going to test the ne versión 2.03 and i´back.

Best regards

 

[Firpas]

Ok, I tried the new version 2.03 on some of my devices (both tablets and S$) and now works fine.

I still think that adding a method to connect to a specific wifi via SSID or BSSID will be very useful.

Thank you very much for your cooperation.

 

[ibra939]

wonderful tool

 

[FrankBerra]

After some headaches using ABWifi V 2.01 i found this bug fix! It works!

Here the results using this codes starting with wifi powered off:

wifi.Initialize("wifi")
wifi.StartWifi
wifi.GetNewReadingWifi

With ABW 2.01
Nexus 5 (5.0.1): no problems at all (Wifi Activation is sooo quick!)
Samsung Galaxy S2 (4.1.2): crashes (probably because WiFi activation is so slow compared to Nexus 5 ?!)

With ABW 2.03
No problems on both devices

Thank You!
You should update the original thread: http://www.b4x.com/android/forum/threads/wifi-library.8613/

 

[Objects for Android]

In the latest reply there is a mention of ABW 2.03 and the first page the version is 2.01
Does the 2.03 version is publicly available ?

Thanks.

 

[Objects for Android]

Just find in the topic the version 2.03, problem is that under 6.50 of B4A library seams not to work properly (When I try to call : ABLoadWifi - I get : Error description: Unknown member: abloadwifi).

Library is well load and my variables in declare in global correctly. The only member I saw are :
StartWifi
StopWifi
Initialize
GetNewReadingWifi
DisableWifi
EnableWifi

Any idea ?