first test to do:ste
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Click a button and programatically launch a new fragment
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Show a list of data in a fragment using a RecyclerView (list view)
3 a) Click a cell in the recycler view and display a Toast message
3 b) Click a cell in the recycler view and programatically launch another fragment
3 c) Click a cell in the recycler view and programatically launch another fragment - displaying the data that was in the cells