Saving Data on Android

ResultActivity.kt
 file under the 
view
 package. Add the following code 
inside 
onCreate()
, importing the 
scoreTextView
 from 
activity_result
 XML:
val
 score = intent.extras?.getInt(QuestionActivity.SCORE) 
val
 numberOfQuestions = 
intent.extras?.getInt(QuestionActivity.NUMBER_OF_QUESTIONS) 
scoreTextView.text = 
String.format(getString(R.string.score_message), score, 
numberOfQuestions)
Saving Data on Android Chapter 9: Using Room with Google's Architecture Components
raywenderlich.com
166

---

That's it! 
build and run
 your app to see it in action:
Now, try clicking the 
START
 button and you should see the empty screen layout:
Saving Data on Android Chapter 9: Using Room with Google's Architecture Components
raywenderlich.com
167

---

Now, go back to the main screen and click the 
prepopulate
 button in your action 
bar:
Click 
START
 and you should now see your question and answers displayed:
Saving Data on Android Chapter 9: Using Room with Google's Architecture Components
raywenderlich.com
168

---

Answer the questions and take a look at the final screen to see your score!
Sweet! Your app is now working and displaying your Question and Answers!
Key points
•
LiveData
 is a data holder class, like a 
List
, that can be observed for changes by an 
Observer
.
•
LiveData
 is lifecycle-aware, meaning it can observe the lifecycle of Android 
components like the 
Activity
 or 
Fragment
. It will only keep updating observers if 
its component is still active.
• The 
ViewModel
 is part of the