Android Xml Views

---
name: android-xml-views
description: "Standards for ViewBinding, RecyclerView, and XML Layouts. Use when implementing XML layouts, ViewBinding, or RecyclerView adapters in Android. (triggers: layout/*.xml, **/*Binding.java, **/*Binding.kt, ViewBinding, ConstraintLayout, RecyclerView)"
---

# Android XML Views Standards

## **Priority: P1**

## Implementation Guidelines

### ViewBinding

- **Standard**: Use ViewBinding for all XML layouts.
- **Synthetics**: `kotlin-android-extensions` is Dead. Remove it.
- **KAPT**: Avoid DataBinding unless strictly necessary (impacts build speed).

### RecyclerView

- **Adapter**: Always inherit `ListAdapter` (wraps AsyncListDiffer).
- **Updates**: Provide a proper `DiffUtil.ItemCallback`. NEVER call `notifyDataSetChanged()`.

### Layouts

- **ConstraintLayout**: Use for complex flat hierarchies.
- **Performance**: Avoid deep nesting (LinearLayout inside LinearLayout).

## Anti-Patterns

- **No findViewById**: Deprecated. Use ViewBinding for all XML layouts.
- **No kotlin-android-extensions**: Deprecated. Remove all `import kotlinx.android.synthetic.*`.

## References

- [ViewBinding & Adapter](references/implementation.md)