Android मा layouts र views कसरी काम गर्छन्? · IT अन्तर्वार्ता अभ्यास

Android मा layouts र views कसरी काम गर्छन्?

Android UIs Views (UI widgets जस्तै बटन, टेक्स्ट) बाट बनाइन्छ जुन ViewGroups/layouts (LinearLayout, ConstraintLayout जस्तै कन्टेनरहरू) द्वारा व्यवस्थित गरिन्छ। परम्परागत रूपमा XML layouts मा परिभाषित, आधुनिक Android ले क्रमशः Jetpack Compose (घोषणात्मक) प्रयोग गर्दैछ। view system को बुझाई UIs निर्माण गर्नको लागि आधारभूत हो।

Views र ViewGroups

text

VIEW → a single UI element (TextView, Button, ImageView, EditText, etc.)
VIEWGROUP → a container that holds/arranges child views (LinearLayout, ConstraintLayout,
  FrameLayout, RecyclerView, etc.) — layouts ARE ViewGroups
→ UIs are a TREE of views inside view groups (composition).

text

LinearLayout → arrange children in a row OR column
ConstraintLayout → flexible, flat layouts via constraints between views (modern, efficient,
  the recommended layout for complex UIs)
FrameLayout → stack/overlay children
RecyclerView → efficient scrolling lists (recycles views for performance — key for lists)

xml

<!-- define the UI declaratively in an XML layout file -->
<LinearLayout android:orientation="vertical" ...>
  <TextView android:text="Hello" .../>
  <Button android:id="@+id/myButton" android:text="Click" .../>
</LinearLayout>

text

JETPACK COMPOSE → modern DECLARATIVE UI toolkit (Kotlin code, no XML):
  → describe UI as composable functions; reactive (UI updates with state)
  → Google's recommended modern approach (similar idea to Flutter/React)
→ New apps increasingly use Compose; XML layouts still common in existing apps.

Android मा layouts र views कसरी काम गर्छन्?

Views र ViewGroups

सामान्य layouts (ViewGroups)

XML layouts (परम्परागत)

आधुनिक: Jetpack Compose

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