Android Question Back button(on Keypress event) crashing app

[Pravin Shah]

Hello,

I have added the following code to capture back key and write my own logic.

Sub Activity_KeyPress (KeyCode As Int)
    If KeyCode = KeyCodes.KEYCODE_BACK Then
        HomePage.MediaPlayer1.Play
    End If
   
End Sub

But whenever I press back button the app crashes with following error log. But if I remove the activity_keypress code module then it works properly. I am not able to debug this problem, can someone help me with this? thanks

java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Boolean
    at b4a.weddingapp.viewvideo$HandleKeyDelayed.runDirectly(viewvideo.java:228)
    at b4a.weddingapp.viewvideo.onKeyDown(viewvideo.java:215)
    at android.view.KeyEvent.dispatch(KeyEvent.java:2609)
    at android.app.Activity.dispatchKeyEvent(Activity.java:2361)
    at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:1819)
    at android.view.ViewRootImpl.deliverKeyEventPostIme(ViewRootImpl.java:3575)
    at android.view.ViewRootImpl.handleImeFinishedEvent(ViewRootImpl.java:3545)
    at android.view.ViewRootImpl$ViewRootHandler.handleMessage(ViewRootImpl.java:2795)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loop(Looper.java:137)
    at android.app.ActivityThread.main(ActivityThread.java:4745)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:511)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
    at dalvik.system.NativeStart.main(Native Method)

 

[An Schi]

If i remember correctly you have to use 'return true or false' properly in this case.
I'm on my phone in the train, so i can't do it for you. But you will find keycode subs examples here with the correct use of return.

 

[eps]

Sub Activity_KeyPress (KeyCode As Int) As Boolean

 

[An Schi]

Here is an old post from myself...lol

Thanks!
The CallSubDelayed solution is working. Below is my whole construct in case someone will dig this out in the future....

Private KC As String

Sub Activity_KeyPress (KeyCode As Int) As Boolean
   If KeyCode = KeyCodes.KEYCODE_BACK Or KeyCode = KeyCodes.KEYCODE_MENU Then
     KC = KeyCode
     CallSubDelayed(Me, "HandleSideBar")
     Return True
   End If
   Return False
End Sub

Sub HandleSideBar
   If KC = KeyCodes.KEYCODE_MENU Then
     If PanelWithSidebar.IsSidebarVisible = True Then
       PanelWithSidebar.CloseSidebar
     Else
       PanelWithSidebar.OpenSidebar
     End If
   Else If KC = KeyCodes.KEYCODE_BACK Then
       If PanelWithSidebar.IsSidebarVisible = True Then
         PanelWithSidebar.CloseSidebar
       Else
         If WV1Extra.CanGoback = True Then
           WV1.Back
         Else
           Activity.Finish
         End If
       End If
   End If
End Sub

 

[Pravin Shah]

Oh..it's really a silly mistake and waste of time on my part.. Looks like I need a break :-( I wrongly copied the syntax.
Thank you all for your help!!