'Handle the back key (see the example project for B4XPages implementation)
Sub Activity_KeyPress (KeyCode As Int) As Boolean 'Return True to consume the event
   If KeyCode = KeyCodes.KEYCODE_BACK Then
       If prefdialog.BackKeyPressed Then Return True
   End If
   Return False
End Sub

'Handle keyboard changes:
Sub IME_HeightChanged (NewHeight As Int, OldHeight As Int)
   prefdialog.KeyboardHeightChanged(NewHeight)
End Sub

Manifest editor:
B4X:
SetActivityAttribute(main, android:windowSoftInputMode, adjustResize|stateHidden)Sub Activity_KeyPress (KeyCode As Int) As Boolean 'Return True to consume the event
	If KeyCode = KeyCodes.KEYCODE_BACK Then
		If pnlAffichage.Visible = True Then
			If lstPersonnes.Size > 1 Then
				lstPersonnes.RemoveAt(lstPersonnes.Size - 1)
				Individu = lstPersonnes.Get(lstPersonnes.Size - 1)
				AfficherFiche(0)
			Else
				pnlAffichage.Visible = False
				lstPersonnes.Clear
			End If
			Return True
		Else
			openMsgBox
			Return True
		End If
	Else
		Return False
	End If
End Sub