Android Question Sleep and resumable subs undestanding

[hookshy]

I have receive some crash lately using this code

Sub grab_customer
    Sleep(2000) 
If manager_ready Then
    'grab customer from time to time
    If File.Exists(File.DirInternal,"trialcustomer.txt")=False Then
        File.WriteString(File.DirInternal,"trialcustomer.txt",DateTime.Now)
                            
    Else
                    
        trialcustomer=File.ReadString(File.DirInternal,"trialcustomer.txt")
                
        If  trialcustomer < DateTime.Now - 3*DateTime.TicksPerDay Then
        
            Dim re As Int
            re=Msgbox2("We thank you for choosing our apps. Do you want to unlock star delta features now ?","Electrician app","OK LET'S GO","no","",Null)
            If re=DialogResponse.POSITIVE Then
                 Try
                    manager.RequestPayment("noads","inapp","ads")
                Catch
                    ToastMessageShow("Billing manager not ready",True)
                End Try

            Else if re=DialogResponse.NEGATIVE Then
                trialcustomer=DateTime.Now 'reset and ask after 3 days again
                File.WriteString(File.DirInternal,"trialcustomer.txt",trialcustomer)
                
                
            Else
                'same practice
                trialcustomer=DateTime.Now
                File.WriteString(File.DirInternal,"trialcustomer.txt",trialcustomer)
            
            
            End If
                
        End If

    End If

End If

End Sub

First of all I guess I am doing something wrong and please do correct my implementation !
I just wanted to wait for the app splash to load before showing something else, I guess is better to use a timer instead.

Please explain why is important for the main thread to keep on going .
I do not want to start changing all msgbox2 to the new asynchronous method because I do not understand it.
You say that Msgbox2 will crash our apps and is not wanted any more ?
I am very confused about the sleep usage and now with the msgbox as well !!

 

[DonManfred]

DoEvents deprecated and async dialogs (msgbox)

Starting from B4A v7.0 the following warning will appear for DoEvents calls: DoEvents is deprecated. It can lead to stability issues. Use Sleep(0) instead (if really needed). The purpose of DoEvents was to allow the UI to be updated while the main thread is busy. DoEvents which shares the same...

www.b4x.com

 

[LucaMs]

Please explain why is important for the main thread to keep on going .

Because the O.S. can consider your app blocked and could kill it.

 

[hookshy]

Sub close_intro
    
    Sleep(5000)
    pnl_intro.Left=Activity.Width
        
End Sub

Is this sub corect ? ....I do not want to return or wait for nothing ...just want to postpone an action

 

[hookshy]

Because the O.S. can consider your app blocked and could kill it.

With the activity on front ? ...what if everyting that will run after the msgbox depends on this result ?
I can keep the msgbox2 on screen forever ...the app does not crash once openned

 

[hookshy]

Here is how the error looks like for the code from first post

anywheresoftware.b4a.B4AUncaughtException:
  at anywheresoftware.b4a.Msgbox.msgbox (Msgbox.java:172)
  at anywheresoftware.b4a.keywords.Common.Msgbox2 (Common.java:443)
  at hs.electrician.com.main$ResumableSub_grab_customer.resume (main.java:1298)
  at anywheresoftware.b4a.keywords.Common$13.run (Common.java:1680)
  at android.os.Handler.handleCallback (Handler.java:790)
  at android.os.Handler.dispatchMessage (Handler.java:99)
  at android.os.Looper.loop (Looper.java:164)
  at android.app.ActivityThread.main (ActivityThread.java:6543)
  at java.lang.reflect.Method.invoke (Native Method)
  at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run (RuntimeInit.java:440)
  at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:810)

Could somebody explained why the app crashed ?

 

[hookshy]

i use sleep in many subs without returning a value .... it is important to understand If this code will block the app or not

Sub close_intro
  
    Sleep(5000)
    pnl_intro.Left=Activity.Width
      
End Sub

to fix the problem with the code from post 1 , I let the code run without the msgbox2 ...I bring a panel in front instead

 

[hookshy]

Here is another example aplication from my apps....i fixed the keyboard close issue by adding a sleep(50) in order to the thread to be able to process this request

Sub hide_keyboard
    Sleep(50)
    IME.HideKeyboard
End Sub

 

[LucaMs]

i use sleep in many subs without returning a value .... it is important to understand If this code will block the app or not

Sub close_intro
    Sleep(5000)
    pnl_intro.Left=Activity.Width
End Sub

I'm not free, now, I answer not so perfectly.

No, that code will not block your app; is works, as Erel said many times, this way:

You can consider Sleep (and Wait For) as it was a Return - exit routine - but after those 5000ms the process - code flow, I don't know how to explain better this, will return to the next line, pnl_intro...

I hope it is... "clear"

 

[Erel]

Watch the video tutorial: https://www.b4x.com/android/forum/threads/b4x-resumable-subs-sleep-wait-for.78601/#content
It will answer all these questions.

 

[hookshy]

Thank you