How can I make a Spinner only by java?

In Android programming, how do I make a spinner change activities?

• I am fairly new to programming for the Android and am attempting to make a program that will run a series of math applications. Each application requires its own layout and, thus, its own activity. However, I have run into trouble when trying to switch activities. The idea was to have a spinner at the top of every page and the moment the user chose a new math app, the program would switch to the chosen activity. Even if there was a "Go" button as well, it would be fine. Any chance someone could write a really simple example program that just has the main activity and how to make the spinner load a new activity?

• Answer:

  Hmm, I guess you can try to go about it that way, but probably a better idea would be to use a view at the top and load a different subview for each of those. Instead of using activities, restructure when you switch to each item, it removes the subview at the bottom and puts a different sub view on the bottom. The reason I recommend this technique is because if you do not, every time you select something different in the spinner, it will reload the spinner and will not look right at all, at least if I what I am visualizing is correct. You could make a sort of a drawer that you can drag through the top, scroll through the functions, and choose one, but even so, using an activity for that would also mean you would have to fix your back button so you do not have to go through all the past activities to exit. It is possible to use only a handful of activities in a multi screen app, the catch is to be sure to correctly unload your subviews and to load your new views into memory before you switch the subviews around. Remember you can always use a manager view that would emulate adding it to a full activity in your code and alter the manager to take up all the space below the spinner. That is how I would go about doing it. Remember you can extend views like managers to be your own custom classes. You cant stuff them in XML as easily (I dont think), but you can stuff their subviews in an xml and load them. You can probably refactor your application to use this structure pretty quickly.