Some Android very basic questions

1. I added a new xml file in res=> string folder called [url removed, login to view] and defined a string . Now I want to use this key in layout for button. I can do the same using [url removed, login to view] file. Not sure how to do this with the newly created file.

2. I want to create multiple layouts. How can I navigate from one layout to anuther by keeping the common control on top of every layout

3. How to add items in dropdown on clicking the button. At top or at last place

Is it possible to send the value from one layout to another Layout or from one activity to another

Skills: Android

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