The general way we deal with events is we 1)Create an instance of the OnEventListener object and provide implementations for all abstract methods 2)Use setOnEventListener function to add the OnEventListener you created True False Match the event handler with the description of what it is {view: View ->(view as TextView).text="I've been clicked ${++i} times"} :v object myOnClick:View.OnLongClickListener{ override fun onLongClick(v: View?): Boolean { if(v is TextView) { V.setTextColor(Color.GREEN) v.text="I've been long clicked!" return true } return false } topEditText. addTextChangedListener(object:TextWatcher{ A. lambda function override fun afterTextChanged(s: Editable?) { A named singleton or object in B. Kotlin which is like a class that override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) { only has 1 instance an anonymous object in Kotlin, override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) { that, in the way it's written, cannot be used as an event } handler for another component }) an inner class that has access D. to the outer classe's private variables in kotlin inner class myClass:TextWatcher { override fun afterTextChanged(s: Editable?) { } override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) { } override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) { } } It is possible to create an OnEventListener without you writing a whole class that implements an interface True False What is all true about an interface An interface is a set of abstract public functions Interfaces have private variables If a class implements an interface, the class gives the abstract methods defined in the interface a body You can make an onClick listener in code using the onClickListener interface without ever having to touch XML What is true about Landscape and portrait mode for an app Even if you don't define a landscape layout, android will try to create this view on the fly and your app will still work in landscape mode if you flip the phone A landscape version of the layout can be a completely different XML file than the portrait version Flipping to landscape mode runs onCreate again and will be lost unless we do something to transfer it between portrait and landscape If you look at the project view you will find that landscape xml file is in the landscape folder within layout