Difference between R.layout and android.R.layout

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What is the difference between

   setContentView(R.layout.main);

and

ArrayAdapter arrayAdapter = new ArrayAdapter(this,
                android.R.layout.simple_spinner_dropdown_item, sarray);

What is the difference between R.layout and android.R.layout?

android-arrayadapter layout android
4 Answers
android.R.

is used for access predefined classes by android SDK (layouts/drawables)

R

is used for access custom classes(that means its layouts/drawables imported/created by user)

user_37108650
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