Android Question ResumableSub in DoWhile loop allowed?

[fredo]

Since ResumableSubs have so many advantages we have reworked a large project completely.

One function raised this error:

java.lang.RuntimeException: Could not read input channel file descriptors from parcel.

Some more details:

Spoiler: the log

*** Service (starter) Create ***
** Service (starter) Start **
** Activity (main) Create, isFirst = true **
** Activity (main) Resume **
main$ResumableSub_test2resume (java line: 459)
java.lang.RuntimeException: Could not read input channel file descriptors from parcel.
    at android.view.InputChannel.nativeReadFromParcel(Native Method)
    at android.view.InputChannel.readFromParcel(InputChannel.java:148)
    at android.view.IWindowSession$Stub$Proxy.addToDisplay(IWindowSession.java:759)
    at android.view.ViewRootImpl.setView(ViewRootImpl.java:531)
    at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:310)
    at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:85)
    at android.app.Dialog.show(Dialog.java:319)
    at anywheresoftware.b4a.keywords.Common.showAndTrackDialog(Common.java:580)
    at anywheresoftware.b4a.keywords.Common.InputListAsync(Common.java:559)
    at b4a.example.main$ResumableSub_test2.resume(main.java:459)
    at b4a.example.main._v0(main.java:433)
    at b4a.example.main$ResumableSub_test1.resume(main.java:410)
    at b4a.example.main._v5(main.java:389)
    at b4a.example.main._activity_resume(main.java:349)
    at java.lang.reflect.Method.invoke(Native Method)
    at anywheresoftware.b4a.BA.raiseEvent2(BA.java:186)
    at anywheresoftware.b4a.BA.raiseEvent(BA.java:166)
    at b4a.example.main.afterFirstLayout(main.java:108)
    at b4a.example.main.access$000(main.java:17)
    at b4a.example.main$WaitForLayout.run(main.java:80)
    at android.os.Handler.handleCallback(Handler.java:739)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:148)
    at android.app.ActivityThread.main(ActivityThread.java:5417)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

Spoiler: the java line 459

This is the neutralized excerpt from the project:

Spoiler: the code

Sub Process_Globals
    Private pgstrColor As String = ""
End Sub
Sub Globals
End Sub
Sub Activity_Create(FirstTime As Boolean)
End Sub

Sub Activity_Resume
    Dim bolRepeat As Boolean = True   
    Do While bolRepeat
        test1
        If pgstrColor = "Red" Then
            bolRepeat = False
        End If
    Loop
    Log(">>end")
End Sub

Sub Activity_Pause (UserClosed As Boolean)
End Sub

Sub test1
    wait for(test2) complete(strResult As String)
    Log("  test1.Selected color: " & strResult)
    pgstrColor = strResult
End Sub

Sub test2 As ResumableSub
    Dim options As List = Array("Red", "Green", "Blue")

    InputListAsync(options, "Select Color", 0, False)
    Wait For InputList_Result (Index As Int)  ' <<<<<<<<<<<<<<<<<

    If Index <> DialogResponse.CANCEL Then
        Return options.Get(Index)
    Else
        Return ""
    End If
End Sub

Do I use the ResumableSubs correctly?

 

[Erel]

The answer to the question in the title is yes. You can use resumable subs in loops.

You must use the new ResumableSub type if you want to wait for a resumable sub to complete. Your current code will create many dialogs.

Correct code:

Do While bolRepeat
 Wait For (test1) Complete (Result As Object) 
 ...
Loop

Sub test1 As ResumableSub
 ...
 Return Null
End Sub