Apa itu View Binding dan Data Binding di Android? · Latihan Wawancara IT

Apa itu View Binding dan Data Binding di Android?

View Binding dan Data Binding adalah fitur Android untuk menghubungkan kode ke views dalam layout XML dengan cara yang lebih aman dan nyaman dibandingkan dengan findViewById yang lama. View Binding menyediakan referensi views yang type-safe; Data Binding selain itu juga mengikat data secara langsung ke 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 dan Data Binding di Android?

Masalah: findViewById

View Binding — referensi views yang type-safe

Data Binding — mengikat data langsung di XML

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