Apa itu View Binding lan Data Binding ing Android? · Latihan Wawancara IT

Apa itu View Binding lan Data Binding ing Android?

View Binding lan Data Binding minangka fitur Android kanggo nyambung kode menyang views ing XML layouts kanthi luwih aman lan gampang tinimbang cara lawas findViewById. View Binding nyediyakake referensi views sing type-safe; Data Binding menambahi kemampuan kanggo ngikat data langsung menyang layouts.

Masalah: findViewById

text

The old way: findViewById to get view references:
  val button = findViewById<Button>(R.id.myButton)
  ✗ verbose; NOT type-safe (cast errors); NOT null-safe (wrong id → null → crash at runtime)
→ View/Data Binding solve these.

kotlin

// View Binding generates a binding class per layout with typed references to its views
val binding = ActivityMainBinding.inflate(layoutInflater)
setContentView(binding.root)
binding.myButton.setOnClickListener { /* ... */ }   // typed, null-safe, no findViewById
binding.titleText.text = "Hello"
// → type-safe (compile-checked), null-safe, concise — the recommended replacement for findViewById

xml

<!-- Data Binding lets you bind data/expressions directly in the layout XML -->
<TextView android:text="@{user.name}" />        <!-- binds to a user object's name -->
<Button android:onClick="@{() -> viewModel.submit()}" />

text

DATA BINDING (more powerful than View Binding):
  → bind layout views directly to data/ViewModels in XML (expressions, two-way binding)
  → can reduce UI-update boilerplate; supports observable data → UI auto-updates
  → more complex; View Binding is simpler and often sufficient
→ Modern apps increasingly use Jetpack COMPOSE instead (no XML binding needed).

Apa itu View Binding lan Data Binding ing Android?

Masalah: findViewById

View Binding — referensi views sing type-safe

Data Binding — ikat data langsung ing XML

Apa sing penting