How do you make the coding for a back to a previous screen button?
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Ohh thanks a lot. It lets you view the previous screen right?
If you have not closed that previous screen previously (makes sense?), it should.
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Yes. The concept here is simple:
When the app is opened, think of it as putting a to-do list on your desk. When you open a new screen, you add another paper on top of the to-do list - instead of switching to the new screen, you add it on top of the current one. To go back, you must remove one "paper" at a time to reveal the last opened screen. You should not open a previously open screen - opening too many will quickly fill up the Android memory and may cause your app to crash.
Yes, these are the examples my brain thinks of. 
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