Android Question Sorting List of Custom Objects?

[he4a]

Hi folks,

I'm trying to sort a list of a custom type called "ScanResult". This list holds the responses i get from scanning my surroundings for wireless networks and gathering their signal strength, ssid etc...

The custom object i made is this:

ScanResult:

Sub Class_Globals

Public MAC As String
Public Channel As Int
Public RSSI As Int
Public SSID As String

End Sub

These Objects are sorted into a List like this:

Public Sub AddScanResult(MAC As String, Channel As Int, RSSI As Int, SSID As String)

Dim it As ScanResult

it.Initialize
it.MAC = MAC
it.Channel = Channel
it.RSSI = RSSI - 128
it.SSID = SSID
ScanList.Add(it)
Log("ScanList.Size is now: " & ScanList.Size)

End Sub

But when i try to sort that list after either MAC adress or SSID using any of the given subs:

Sort
SortCaseInsensitive
SortType
SortTypeCaseInsensitive

i always get an error:

-------------------------------------------------------------------------------------------
Error occurred on line: 839 (DeviceSettings)

java.lang.ClassCastException: de.hallererne.mstknwlanconfigurator.scanresult cannot be cast to java.lang.Comparable

at anywheresoftware.b4a.objects.collections.List$3.compare(List.java:1)

at java.util.TimSort.countRunAndMakeAscending(TimSort.java:320)

at java.util.TimSort.sort(TimSort.java:185)

at java.util.Arrays.sort(Arrays.java:1998)

at java.util.Collections.sort(Collections.java:1900)

at anywheresoftware.b4a.objects.collections.List.SortCaseInsensitive(List.java:222)

at java.lang.reflect.Method.invoke(Native Method)

at anywheresoftware.b4a.shell.Shell.runVoidMethod(Shell.java:753)

at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:343)

at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:247)

at java.lang.reflect.Method.invoke(Native Method)

at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:134)

at anywheresoftware.b4a.keywords.Common.CallSub4(Common.java:897)

at anywheresoftware.b4a.keywords.Common.CallSubNew3(Common.java:847)

at java.lang.reflect.Method.invoke(Native Method)

at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:708)

at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:340)

at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:247)

at java.lang.reflect.Method.invoke(Native Method)

at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:134)

at anywheresoftware.b4a.BA$2.run(BA.java:328)

at android.os.Handler.handleCallback(Handler.java:746)

at android.os.Handler.dispatchMessage(Handler.java:95)

at android.os.Looper.loop(Looper.java:148)

at android.app.ActivityThread.main(ActivityThread.java:5443)

at java.lang.reflect.Method.invoke(Native Method)

at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728)

at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)

---------------------------------------------------------------------------------------------------

maybe it's because there are several items with the same SSID and MAC in that List? so it's not a unique value? right now its like this:


SSID1
SSID3
SSID2
SSID1
SSID1
SSID2
SSID4
SSID3
SSID1

i just want to show it like this:

SSID1
SSID1
SSID1
SSID1
SSID2
SSID2
SSID3
SSID3
SSID4

is it possible to sort the list like this or do i have to think of some other way to do it?

Thanks in advance, Rob

 

[udg]

Hi Rob, please have a look at list.SortType

In your case it could be something like:

ScanList.SortType("SSID",true)

udg

 

[DonManfred]

Instead of a class you should use the Type command.
Define it in Globals or ProcessGlobals

Type ScanResult(MAC As String, Channel As Int, RSSI As Int, SSID As String)

Then use it in your class

Public Sub AddScanResult(MAC As String, Channel As Int, RSSI As Int, SSID As String)

Dim it As ScanResult

it.Initialize
it.MAC = MAC
it.Channel = Channel
it.RSSI = RSSI - 128
it.SSID = SSID
ScanList.Add(it)
Log("ScanList.Size is now: " & ScanList.Size)

End Sub

https://www.b4x.com/android/forum/pages/results/?query=type

 

[udg]

Hi Manfred,
you're right. I don't know how I could have read "Public Sub AddScanResult(MAC As String, Channel As Int, RSSI As Int, SSID As String)" for "Type ScaResult..." but that was exactly what I considered while replying.
It's incredible that I missed entirely what was written in the post and worked a response based on what was in my mind..eheh
Fortunately I turned off the PC soon after that and resumed the reading of a good book.

bye

 

[he4a]

Works like a charm! Thx alot!