Mi fragmento base :
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 } } Pero esta línea no funciona _binding = Binding.inflate(inflater, container, false)
Hay un código que funciona, pero en cuanto a mí, esto es una codificación de mierda:
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() }Cómo hacerlo bien cualquiera tiene una solución limpia. Sé que DataBinding tiene DataBindingUtil pero necesito ViewBinding . ¿Hay algo similar para ViewBinding?
espero sus respuestas
.
EDITAR
Biblioteca: https://github.com/kirich1409/ViewBindingPropertyDelegate
Fragmento base:
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() { } }Esta es mi baseViewBinding.
import android.content.pm.ActivityInfo import android.os.Bundle import android.view.LayoutInflater import android.view.View import android.view.ViewGroup import androidx.fragment.app.Fragment import androidx.viewbinding.ViewBinding import java.lang.reflect.ParameterizedType /** * author:yxf * time:2021/9/3 * BaseBindingFragment */ abstract class BaseBindingFragment<VB : ViewBinding> : Fragment() { private var _binding : VB? = null val binding :VB get() = _binding!! override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? { val type = javaClass.genericSuperclass val clazz = (type as ParameterizedType).actualTypeArguments[0] as Class<VB> val method = clazz.getMethod("inflate", LayoutInflater::class.java, ViewGroup::class.java, Boolean::class.java) _binding = method.invoke(null, layoutInflater, container, false) as VB return _binding!!.root } override fun onViewCreated(view: View, savedInstanceState: Bundle?) { super.onViewCreated(view, savedInstanceState) init() } abstract fun init() override fun onDestroyView() { _binding = null super.onDestroyView() } }Usar
class HomeFragment : BaseBindingFragment<FragmentHomeBinding>() { override fun init() { //TODO() you can use binding in the whole Fragment } }abstract class BaseFragment<DB : ViewDataBinding> : Fragment(), ViewContract<DB>, BaseConstant { private var isRegistered = false override fun onCreateView( inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle? ): View? { if (getLayoutResourceId() != 0) { val binding: DB = DataBindingUtil.inflate(inflater, getLayoutResourceId(), container, false) binding.setLifecycleOwner { lifecycle} onBindData(binding) return binding.root } else { throw IllegalArgumentException("layout resource cannot be null") } } override fun onResume() { super.onResume() if (!isRegistered) { kotlinBus.register(this) isRegistered = true } } override fun onActivityCreated(savedInstanceState: Bundle?) { super.onActivityCreated(savedInstanceState) onInitLiveData() } override fun onViewCreated(view: View, savedInstanceState: Bundle?) { super.onViewCreated(view, savedInstanceState) initView() initActionView() } open fun initView() { //TODO init view such as adapter, linearLayoutManager } open fun initActionView() { //TODO init action for view such as onClick } open fun onInitLiveData(){ } override fun onDetach() { super.onDetach() if (isRegistered) { kotlinBus.unregister(this) isRegistered = false } } override fun onBindData(binding: DB) { //TODO binding data into layout } }Interfaz simple de ViewContract:
interface ViewContract<DB> { fun getLayoutResourceId(): Int fun onBindData(binding: DB) }y su clase de fragmento podría ser:
class SampleFragment : BaseFragment<FragmentSampleBinding>() { private val viewModel by viewModel<HabitsProgressOverallViewModel>() @ExperimentalCoroutinesApi private val homeViewModel: HomeViewModel by sharedViewModel() override fun getLayoutResourceId(): Int { return R.layout.fragment_sample } override fun onBindData(binding: FragmentOverallHabitsCompletionBinding) { super.onBindData(binding) binding.viewModel = viewModel } }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 }InicioFragmento.kt
class HomeFragment() : BaseFragment<FragmentHomeBinding>(FragmentHomeBinding::inflate) { override fun onViewCreated(view: View, savedInstanceState: Bundle?) { super.onViewCreated(view, savedInstanceState) binding.homeText.text = "Hello view binding" } }