Saving Data on Android

Utils.kt
 under the root package.
Open 
MainActivity.kt
 and add the following property at the top of your class:
private
 
val
 viewModel 
by
 lazy { getViewModel 
{ MainViewModel(Repository()) } }
The above code uses lazy initialization to create your 
MainViewModel
 using 
getViewModel()
 which automatically takes care of the initialization and creation 
logic of the 
ViewModel
s using a 
ViewModelFactory
.
Next, you need to set up menu actions for the user:
private
 
fun
 
prepopulateQuestions
()
 = 
viewModel.prepopulateQuestions() 
// 1
 
 
private
 
fun
 
clearQuestions
()
 = viewModel.clearQuestions() 
// 2
 
 
override
 
fun
 
onOptionsItemSelected
(item: MenuItem)
: 
Boolean
 { 
// 
3
 
  
when
 (item.itemId) { 
    R.id.prepopulate -> prepopulateQuestions() 
    R.id.clear -> clearQuestions() 
    
else
 -> toast(
"error"
) 
  } 
  
return
 
super
.onOptionsItemSelected(item) 
}
Step by step:
1.
prepopulateQuestions()
 uses your 
viewModel
 to prepopulate your Room 
database with sample question and answer records.
2.
clearQuestions()
 uses your 
viewModel
 to clear all the rows in your database.
3. Here, you are adding the appropriate actions to your 
Activity
's action bar. If the 
user taps on the