Android में View Binding और Data Binding क्या हैं?

View Binding और Data Binding Android features हैं जो पुराने findViewById की तुलना में code को XML layouts में views से अधिक सुरक्षित और सुविधाजनक रूप से जोड़ते हैं। View Binding type-safe view references प्रदान करता है; Data Binding अतिरिक्त रूप से data को सीधे layouts से bind करता है।

समस्या: 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).

Android में View Binding और Data Binding क्या हैं?

समस्या: findViewById

View Binding — type-safe view references

Data Binding — XML में सीधे data bind करना

यह क्यों महत्वपूर्ण है