1.main.xml
   a.Spinner height change
   b.layout switch between currency and quantity
   c.total spend textview id change

 2.AddSpendFragement
   a.on DatabaseAdd BUtton , the listview , arraylist and totalspendtextview is cleared
   b.added lifecycle methods

 3.WholeSpendActivity
   a.in ViewPager , the setOffscreenPageLimit is set to 3
   b.onbackpressed is added to prompt a dialog