Thank you for the contribution TreKing. I learned about start new activities using the Intent objects. However I don't thing it is suitable for my idea. Intent are useful in apps that have one 'menu' screen which has many buttons leading to other screens. In my app I don't want any menu screen - each screen has only one button leading to the next screen(maybe in the future it would have a second one working as a 'back' button). So you start with screen A with 1 button, you press it and go to screen B with 1 button, you press it and go to screen C with 1 button, you press it and return to screen A.This forms a kind of 'ring' of screens. So I don't see a way to do it with starting new activities. More over I need to pass Java objects holding data 'between the screens' and I also don't know how to pass such an object to a new activity. Your advice is good and popular but not proper for my idea.
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