title: requireActivity() and requireContext() in kotlin
body: <p>What is the purpose of  <a href="https://developer.android.com/reference/kotlin/androidx/fragment/app/Fragment#requireActivity()" rel="nofollow noreferrer"><code>requireActivity()</code></a> and <a href="https://developer.android.com/reference/androidx/fragment/app/Fragment#requireContext()" rel="nofollow noreferrer"><code>requireContext()</code></a> in <code>Fragment</code>?</p>