Android ViewBinding使用流程

// 传统方式 vs ViewBinding
val textView = findViewById<TextView>(R.id.tv_title)  // 传统
binding.tvTitle.text = "Hello ViewBinding"            // ViewBinding

android {
    buildFeatures {
        viewBinding true
    }
}

<LinearLayout>
    <TextView android:id="@+id/tvHeader" />
    <Button android:id="@+id/btnSubmit" />
</LinearLayout>

public final class ActivityMainBinding {
  public final TextView tvHeader;
  public final Button btnSubmit;
  ...
}

class MainActivity : AppCompatActivity() {
    private lateinit var binding: ActivityMainBinding
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding = ActivityMainBinding.inflate(layoutInflater)
        setContentView(binding.root)  // 关键：设置根视图
        // 直接访问视图
        binding.tvHeader.text = "Welcome"
        binding.btnSubmit.setOnClickListener {
            // 处理点击事件
        }
    }
}

class HomeFragment : Fragment() {
    private var _binding: FragmentHomeBinding? = null
    private val binding get() = _binding!! // 安全解包
    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View {
        _binding = FragmentHomeBinding.inflate(inflater, container, false)
        return binding.root
    }
    override fun onDestroyView() {
        super.onDestroyView()
        _binding = null  // 防止内存泄漏
    }
}

class CustomView @JvmOverloads constructor(
    context: Context,
    attrs: AttributeSet? = null
) : LinearLayout(context, attrs) {
    private val binding = CustomViewBinding.inflate(
        LayoutInflater.from(context), 
        this, 
        true
    )
    init {
        binding.tvLabel.text = "Custom Component"
    }
}

private val binding get() = _binding!! 

interface BindableFragment<B : ViewBinding> {
    val binding: B
}

class UserViewHolder(val binding: ItemUserBinding) : 
    RecyclerView.ViewHolder(binding.root) {
    fun bind(user: User) {
        binding.tvName.text = user.name
    }
}

<include 
    android:id="@+id/toolbar"
    layout="@layout/toolbar" />

binding.toolbar.tvTitle.text = "Home"  // 直接访问子视图

<LinearLayout
    tools:viewBindingIgnore="true">  <!-- 在根布局添加 -->

<LinearLayout
    tools:viewBindingIgnore="true">  <!-- 在根布局添加 -->

// 与传统findViewById共存
val oldView = findViewById<TextView>(R.id.legacy_view)
binding.modernView.text = "New Approach"