neoseurae12/GeoQuiz

GeoQuiz tests the user's knowledge of geography. The user presses TRUE or FALSE to answer the question onscreen, and GeoQuiz provides instant feedback.

GeoQuiz

Interactive User Interfaces

View Binding

binding = ActivityMainBinding.inflate(layoutInflater)
setContentView(binding.root)

• binding = ActivityMainBinding.inflate(layoutInflater)
  • ① obtain a reference to the layout
  • ② inflate the layout
• setContentView() 메서드
  • setContentView(@LayoutRes int layoutResID)
    • XML 레이아웃 파일의 리소스 ID을 받아 해당 XML 레이아웃을 inflate하고 Activity의 ContentView로 설정
      • Activity가 '내부적으로(internally)' 그것의 layoutInflater을 사용함
    • UI를 정적으로 정의할 때 주로 사용
  • setContentView(View view)
    • 이미 inflate 되어 인스턴스화된 View 객체를 사용하여 Activity의 ContentView로 설정
    • 동적으로 View를 생성하거나 다른 레이아웃 파일에서 inflate한 View를 사용할 때 유용

Vector Drawable

The Activity Lifecycle

Persisting UI State

ViewModel

ViewModel

Saved Instance State

SavedStateHandle

Android Jetpack Components (= Jetpack; Androidx)

Instance State

Debugging Android Apps

Logcat

Debugger

Conditional Breakpoints

Android Lint

번외: Layout Inspector, Profiler

Testing

• Unit Testing
• source sets
  • main
  • androidTest
  • test (unitTest)
• JUnit
• assertion
  • @Before
  • @After
  • @Test

JVM Tests

• on my development machine

• for ViewModel

• given, when, then

  • given => set-up
  • when => test
  • then => verify

Instrumented Tests

• on an Android device

• for Android components

  • ex. Activity

• Espresso

  • fluent interface
  • Espresso assertion
    • view matcher
    • view assertion

• ActivityScenario