Something like this should work for you. Be sure to change all the EditText names to whatever you like.
B4X:
Sub Globals
Dim sets As Map
sets.Initialize
End Sub
Sub savebtns
sets.Clear
sets.Put("EditText1", EditText1.Text)
sets.Put("EditText2", EditText2.Text)
File.WriteMap(File.DirInternal, "btnset.set", sets)
End Sub
Sub loadbtns
sets = File.ReadMap(File.DirInternal, "btnset.set")
EditText1.Text = sets.Get("EditText1")
EditText2.Text = sets.Get("EditText2")
End Sub