Back Button

briant1972 · Sep 27, 2011

Is there a way to disable the back button? I'm writing a kiosk program and am having trouble with the back button screwing up my bluetooth connection. When I press the home button, the app eventually returns and the bluetooth still works, but when I use the back button, it the app restarts but bluetooth is not working right. I have to disconnect and reconnect. Ultimately, the device only going needs to run the "kiosk" app so functionality of the back button is not important to me.

Paulsche · Sep 27, 2011

B4X:

Sub Activity_KeyPress (KeyCode As Int) As Boolean                     
   If Keycode = KeyCodes.KEYCODE_BACK Then                           ' Hardware-Zurück Taste gedrückt
      Return True                                             ' Hardware-Zurück Taste deaktiviert
   Else
      Return False
   End If 
End Sub

briant1972 · Sep 27, 2011

Thanks. It works great. It doesn't seem to work with the home key, but I can live with that.

Thanks again

Kamac · Sep 27, 2011

Thanks. It works great. It doesn't seem to work with the home key, but I can live with that.

You're unable to block home key in Android. It's not B4A's limits, it's Google's

Erel · Sep 28, 2011

See the kiosk tutorial: Basic4android Search: Kiosk

MDEnt · Oct 10, 2011

Sub Activity_KeyPress (KeyCode As Int) As Boolean
If KeyCode = KeyCodes.KEYCODE_BACK Then
Select Msgbox2("Leave the adventure?", "", "Quit", "Restart", "Cancel", Null)
Case DialogResponse.NEGATIVE
Return True
Case DialogResponse.CANCEL
startButton_Click
Return True
Case DialogResponse.POSITIVE
quitandsave
End Select
End If
End Sub

Expanding on the disable back key in this thread, is there a way to disable the back key once this Msgbox2 has appeared - forcing only the options of Quit, Restart, or Cancel. I've played with an Else in there (now removed) and can't seem to get it right.

Thanks!

klaus · Oct 10, 2011

You should use this code:

B4X:

Sub Activity_KeyPress (KeyCode As Int) As Boolean
  If KeyCode = KeyCodes.KEYCODE_BACK Then 
    Select Msgbox2("Leave the adventure?", "", "Quit", "Restart", "Cancel", Null)
    Case DialogResponse.NEGATIVE
      Return True
    Case DialogResponse.CANCEL
      startButton_Click
      Return True
    Case DialogResponse.POSITIVE
      quitandsave
    End Select
  End If
[COLOR=red]  Return False
[/COLOR]End Sub

MDEnt · Oct 10, 2011

I've tried that, what it seems to do is not only return me to the activity module where the Keypress Sub sits, but also automatically throws me back to the prior activity module. So in other words, hitting the back key during the messagebox2 throws me back 2 "screens."

Back Button

briant1972

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Paulsche

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briant1972

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Kamac

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Erel

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MDEnt

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klaus

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MDEnt

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