我的 基 fragment :
abstract class BaseFragment<ViewModel : BaseViewModel, Binding : ViewBinding> : Fragment() {
protected abstract val viewModel: ViewModel
private var _binding: Binding? = null
protected val binding get() = _binding!!
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?
): View? {
_binding = Binding.inflate(inflater, container, false) //This line not working
return binding.root
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
initialize()
setupListeners()
observe()
}
abstract fun initialize()
abstract fun setupListeners()
abstract fun observe()
override fun onDestroyView() {
super.onDestroyView()
_binding = null
}
}
但是这条线不起作用_binding = Binding.inflate(inflater, container, false)
有一个工作代码,但对我来说这是狗屎编码:abstract class BaseFragment<ViewModel : BaseViewModel, T : ViewBinding>() : Fragment() {
private var _binding:T? = null
protected abstract val viewModel: ViewModel
protected val binding get() = _binding!!
override fun onCreateView(
inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?
): View? {
val superclass: Type = javaClass.genericSuperclass!!
val aClass = (superclass as ParameterizedType).actualTypeArguments[1] as Class<*>
try {
val method: Method = aClass.getDeclaredMethod(
"inflate",
LayoutInflater::class.java,
ViewGroup::class.java,
Boolean::class.javaPrimitiveType
)
_binding = method.invoke(null, layoutInflater, container, false) as T
} catch (e: Exception) {
e.printStackTrace()
}
return binding.root
}
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
initialize()
setupListeners()
observe()
}
override fun onDestroyView() {
super.onDestroyView()
_binding = null
}
abstract fun initialize()
abstract fun setupListeners()
abstract fun observe()
}
如何正确地做任何人都有一个干净的解决方案。我知道 数据绑定(bind) 有 DataBindingUtil 但我需要 View 绑定(bind) . 有类似的东西吗? View 绑定(bind) 我希望你的答案
.
编辑
图书馆: https://github.com/kirich1409/ViewBindingPropertyDelegate
基本 fragment :
abstract class BaseFragment<ViewModel : BaseViewModel, Binding : ViewBinding>(
layoutID: Int
) : Fragment(layoutID) {
protected abstract val viewModel: ViewModel
protected abstract val binding: Binding
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
setupViews()
setupListeners()
setupObservers()
}
abstract fun setupViews()
abstract fun setupListeners()
abstract fun setupObservers()
}
class Fragment : BaseFragment<BaseViewModel, FragmentBinding>(
R.layout.fragment
) {
override val viewModel: BaseViewModel by viewModels()
override val binding: FragmentBinding by viewBinding() // this is from library
override fun setupViews() {
}
override fun setupListeners() {
}
override fun setupObservers() {
}
}
最佳答案
BaseFragment.kt
typealias Inflate<T> = (LayoutInflater, ViewGroup?, Boolean) -> T
abstract class BaseFragment<VB: ViewBinding>(
private val inflate: Inflate<VB>
) : Fragment() {
private var _binding: VB? = null
val binding get() = _binding!!
override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
_binding = inflate.invoke(inflater, container, false)
return binding.root
}
override fun onDestroyView() {
super.onDestroyView()
_binding = null
}
HomeFragment.ktclass HomeFragment() : BaseFragment<FragmentHomeBinding>(FragmentHomeBinding::inflate) {
override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
super.onViewCreated(view, savedInstanceState)
binding.homeText.text = "Hello view binding"
}
}
关于android - 如何使用 View 绑定(bind)制作 BaseFragment,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/64819181/