Android Question B4X error using B4XPage_CloseRequest

[amer bashar]

Hi,
for using the android back button I used this code in the B4XMainPage:

private Sub B4XPage_CloseRequest As ResumableSub
    Dim sf As Object = xui.Msgbox2Async("Close?", "Title", "Yes", "Cancel", "No", Null)
    Wait For (sf) Msgbox_Result (Result As Int)
    If Result = xui.DialogResponse_Positive Then
        Return True
    End If
End Sub

and this default code in Main :

Sub Activity_KeyPress (KeyCode As Int) As Boolean
    Return B4XPages.Delegate.Activity_KeyPress(KeyCode)
End Sub

This error occured :
Error occurred on line: 7208 (B4XPagesDelegator)
java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invoke(Native Method)
at anywheresoftware.b4a.keywords.Common.CallSubDebug(Common.java:1050)
at sama.sport.b4xpagesmanager$ResumableSub_HandleCloseRequest.resume(b4xpagesmanager.java:843)
at sama.sport.b4xpagesmanager._handlecloserequest(b4xpagesmanager.java:810)
at sama.sport.b4xpagesmanager._activity_keypress(b4xpagesmanager.java:565)
at sama.sport.b4xpagesdelegator._activity_keypress(b4xpagesdelegator.java:51)
at java.lang.reflect.Method.invoke(Native Method)
at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:732)
at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:351)
at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:255)
at java.lang.reflect.Method.invoke(Native Method)
at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:144)
at sama.sport.main$HandleKeyDelayed.runDirectly(main.java:231)
at sama.sport.main$HandleKeyDelayed.run(main.java:228)
at android.os.Handler.handleCallback(Handler.java:873)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:216)
at android.app.ActivityThread.main(ActivityThread.java:7266)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:494)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:975)
Caused by: java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
at anywheresoftware.b4a.debug.Debug.CallSub4(Debug.java:336)
at anywheresoftware.b4a.debug.Debug.CallSubNew(Debug.java:282)
... 21 more
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invoke(Native Method)
at anywheresoftware.b4a.debug.Debug.CallSub4(Debug.java:318)
... 22 more
Caused by: java.lang.ClassCastException: anywheresoftware.b4a.keywords.Common$ResumableSubWrapper cannot be cast to java.lang.String
at sama.sport.b4xmainpage._b4xpage_closerequest(b4xmainpage.java:5824)
... 24 more

It is unbelievable I have already wrote 9000 lines code for his app and published it to appstore and still cant use the android back button

 

[agraham]

Your code in B4XPage_CloseRequest is what I have used in B4XMainPage in my B4XPages test app. I've just tried it in Relase and both legacy and normal debug modes with no problem.

Private Sub B4XPage_CloseRequest As ResumableSub
    Log("MainPage CloseRequest")
    ' Close the Drawer and don't exit if it's open
    If Drawer.LeftOpen Then
        CloseDrawerAndReset
        Return False
    End If
    ' The usual make sure dialog
    Dim sf As Object = xui.Msgbox2Async("Close?", "B4XPagesTest", "Yes", "Cancel", "No", Null)
    Wait For (sf) Msgbox_Result (Result As Int)
    Log(Result)
    If Result = xui.DialogResponse_Positive Then
        Return True
    End If
    Return False
End Sub

I'm a bit puzzled as to how you can get a different result unless things are not as you posted forB4XPage_CloseRequest. I would run it in release mode and if the error occurs look in the b4xmainpage.java file in the project Object/src/... folder tree around the line number given by b4xmainpage.java: in the error line
Caused by: java.lang.ClassCastException: anywheresoftware.b4a.keywords.Common$ResumableSubWrapper cannot be cast to java.lang.String
at sama.sport.b4xmainpage._b4xpage_closerequest(b4xmainpage.java:5824)
for the Java code for the _b4xpage_closerequest and see the Java code for what is happening.

 

[amer bashar]

Thank you very much,
I tried Release mode and it crashes at the same situation
I reviewed the java file you mentioned around the line 5824 but nothing is related to back button in that code, unfortunately I didn`t understand anything in java

case 154:
//do until
this.state = 157;
while (!(_randomplayer[(int) (14)]!=_randomplayer[(int) (13)])) {
this.state = 156;
if (true) break;
}
if (true) break;

case 156:
//C
this.state = 154;
//BA.debugLineNum = 8517;BA.debugLine="randomplayer(14) = Rnd(0,count)";
_randomplayer[(int) (14)] = parent.__c.Rnd((int) (0),_count);
if (true) break;

 

[agraham]

That code isn't for B4XPage_CloseRequest. Don't use '5824' as the line number, it should be the actual one in the error line I indicated.

 

[amer bashar]

Sorry for my stupidity but I tried another way :
I called a sub in B4XMainPage that sub runs the code I need for the back button, I called it from Main as following :

Sub Activity_KeyPress (KeyCode As Int) As Boolean
    B4XPages.MainPage.TopBack_Touch(0,0,0)
    'Return B4XPages.Delegate.Activity_KeyPress(KeyCode)
End Sub

So it runs perfect and immediately closed the app (its default behavior)
How can I stop it from closing? Thank you for your help

 

[agraham]

How can I stop it from closing?

I don't know As I said above the code works fine for me so I guess you are doing something wrong somewhere.

 

[amer bashar]

OK, done it this way :

Sub Activity_KeyPress (KeyCode As Int) As Boolean
    B4XPages.MainPage.BackSub
    Return True
End Sub