Android Question How to code wait for result of user's pressed the key

emexes said:

Does the B4A app see KEYCODE_BACK?

I thought that key (and the two other system buttons) were handled by Android.

Having said that, I'll give it a try here whilst I've got the phone connected.

Click to expand...

emexes said:

Dare I ask: what are we actually trying to do?

Like, doesn't pressing the back button take you back to the previous activity anyway?

Btw sorry I got distracted, now I'm *really* going to give it a try *now*.

Click to expand...

Sagenut said:

Try with this for the call

B4X:

Wait For BackWasPressed    'BackWasPressed can be anything else you want with a meaning for you
Callsub(Me, Activity2)

and this for the KeyPress

B4X:

Sub Activity_KeyPress (KeyCode As Int) As Boolean
    If KeyCode=KeyCodes.KEYCODE_BACK Then
        #If B4A
            Dim MC As MenuClose
            MC.Initialize(Colors.ARGB(200,150,150,150),Colors.Blue)
            CallSubdelayed(Me, "BackWasPressed")    'Here you need to use what you wrote in the Wait For
        #End If
        Return True
    End If
  
    Return False
  

'    Return B4XPages.Delegate.Activity_KeyPress(KeyCode)
End Sub

Click to expand...

StartActivity(Activity2)
'Activity.Finish
Wait For BackWasPressed
CallSub(Me, Activitivity2)

Sagenut said:

Try with this for the call

B4X:

Wait For BackWasPressed    'BackWasPressed can be anything else you want with a meaning for you
Callsub(Me, Activity2)

and this for the KeyPress

B4X:

Sub Activity_KeyPress (KeyCode As Int) As Boolean
    If KeyCode=KeyCodes.KEYCODE_BACK Then
        #If B4A
            Dim MC As MenuClose
            MC.Initialize(Colors.ARGB(200,150,150,150),Colors.Blue)
            CallSubdelayed(Me, "BackWasPressed")    'Here you need to use what you wrote in the Wait For
        #End If
        Return True
    End If
 
    Return False
 

'    Return B4XPages.Delegate.Activity_KeyPress(KeyCode)
End Sub

Click to expand...

StartActivity(Activity2)
'Activity.Finish
Wait For BackWasPressed
CallSub(Me, Activity2)