Android Question Multiple click on Item in CLV

[pliroforikos]

Hello world.

I have some clvs with names of my students. When i click on a student then a new clv shows more details about him/her. For example the firstname, surname, tests points etc.
The data taken from a database in web.

The problem is when i double click the list item it fetches student information 2 times or more if i clicked fast enough.

The question is how i can prevent double or triple clicking on a list item before first click event run.

 

[AnandGupta]

There are multiple solution.
You can use public variable and set it true in called sub, return from sub if found true (second click) , set it false after done.
Or disable the clv on click,
etc.

 

[udg]

Another, simple, no-code solution: don't click twice

Sorry, I couldn't resist.

 

[AnandGupta]

Another, simple, no-code solution: don't click twice

Sorry, I couldn't resist.

Actually the op will never click twice, but his users will. I have faced this in nearly all my released products.
It looks like the users are hell bent to find errors. GOD Bless them.

 

[pliroforikos]

There are multiple solution.
You can use public variable and set it true in called sub, return from sub if found true (second click) , set it false after done.
Or disable the clv on click,
etc.

I have already used first proposal like this

Private Sub clvStudents_ItemClick (Index As Int, Value As Object)
 If lockCLV = True  Then
        Return
    End If
    lockCLV = True

without succes, and at the end of clvStudents_ItemClick i turn flag to False
Are u using other place to check flag?

 

[AnandGupta]

Just add log and check,

Private Sub clvStudents_ItemClick (Index As Int, Value As Object)

log("lockCLV " & lockCLV)

If lockCLV = True  Then
Return
End If
lockCLV = True

 

[pliroforikos]

In both clicks flag is false.

Maybe because i am using resumable function to get my data the program continues and flag goes back to true at then end?

 

[AnandGupta]

In both clicks flag is false.

Maybe because i am using resumable function to get my data the program continues and flag goes back to true at then end?

Well posting your project (or sample one) may help experts here to solve it.

 

[pliroforikos]

Thank you very much for your time,

It's a bit difficult to reproduce the code without my data.
I 'll continue my efforts.

 

[Andrew (Digitwell)]

Here is a suggestion, without seeing some code, I can't be sure...

The problem is likely to be that you are resetting the lockClv to false without waiting for the resumable sub to complete

for example:

lockClV = true
PerformResumeableSub
LockCLV = false

in the example, lockCLV will only be true for a *VERY* short space of time

if you write the code like this:

lockCLV = true
wait for (performResumeablesub) complete
lockclv = false

then lockCLV will not get reset until the resumeablesub is complete

 

[Sagenut]

Everything is managed in the ItemClick event?
What about

Private Sub clvStudents_ItemClick (Index As Int, Value As Object)
 clvStudents.AsView.Enabled = False
 
 ' Here do the Database read and other CLV compilation
 
 clvStudents.AsView.Enabled = True

 

[Andrew (Digitwell)]

Ok,
if the database read or other operations use resumeable subs you need to use wait for or the processing will continue at this level.

see this thread which may help explain:

Resumable Subs - order of execution

Hi all, within a initialize of a class I run three resumable subs: "Download1", "Download2" and "Download3": 'Initializes the object. You can add parameters to this method if needed. Public Sub Initialize Download1 'Resumable Sub1 Download2 'Resumable Sub2 Download3 'Resumable Sub3...

www.b4x.com

and

[B4X] Resumable subs that return values (ResumableSub)

Remember that that a call to Sleep or Wait For in a resumable sub causes the code flow to return to the parent. Example: Sub Button1_Click Sum(1, 2) Log("after sum") End Sub Sub Sum(a As Int, b As Int) Sleep(100) 'this will cause the code flow to return to the parent Log(a + b) End Sub...

www.b4x.com

I would move the work out to a sub so that you can wrap the whole lot in one wait for at the itemclick level.

 

[pliroforikos]

Thank you all i will check asap your suggestions and i'll tell you about.

Now i am using this method as described above with a small improve.
lockCLV = true
wait for (performResumeablesub) complete
lockclv = false