多布局的样式是继承的BaseItemProvider,重写的方法是onCreateViewHolder， 也可以直接这样写吗？ override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): BaseViewHolder { return super.onCreateViewHolder(parent, viewType).withBinding { ItemFooBinding.bind(it) } }

作者有遇到如下问题吗？ 打release包打开app就闪退， 报错内容是java.lang.ClassCastException: libcore.reflect.WildcardTypeImpl cannot be cast to java.lang.Class 代码很简单：

abstract class BaseActivity<VB : ViewBinding> : AppCompatActivity() {
  protected lateinit var binding: VB

  abstract fun initView()

  override fun onCreate(savedInstanceState: Bundle?) {
      super.onCreate(savedInstanceState)

      val type = javaClass.genericSuperclass as ParameterizedType
      val aClass = type.actualTypeArguments[0] as Class<*>
      val method = aClass.getDeclaredMethod("inflate", LayoutInflater::class.java)
      val cls = method.invoke(null, layoutInflater)
      binding = cls as VB

      setContentView(binding.root)

      initView()
  }
}

class MainActivity : BaseActivity<ActivityMainBinding>() {
  override fun initView() {
  }
}

加了混淆规则还是无效：

-keepclassmembers class * implements androidx.viewbinding.ViewBinding {
  public static * inflate(android.view.LayoutInflater);
  public static * inflate(android.view.LayoutInflater, android.view.ViewGroup, boolean);
  public static * bind(android.view.View);
}

作者有什么解决方法嘛？

版本号：2.0.5

Fragment绑定失败？原始代码为：

<!-- activity_main.xml -->
<androidx.fragment.app.FragmentContainerView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/fragment_container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:name="**.main.MainFragment"
    android:fitsSystemWindows="true"/>

<!-- MainFragment -->
class MainFragment : Fragment() {
    private val binding:FragmentMainBinding by binding()

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        binding.content.text = "123456"
    }
}

但是在页面中，MainFragment的布局无法加载出来。

查看源码，发现并没有将View绑定至Fragment的相关代码：

class FragmentBindingProperty<VB : ViewBinding>(private val clazz: Class<VB>) : ReadOnlyProperty<Fragment, VB> {

  override fun getValue(thisRef: Fragment, property: KProperty<*>): VB =
    requireNotNull(thisRef.view) { "The property of ${property.name} has been destroyed." }
      .getBinding(clazz).also { binding ->
        if (binding is ViewDataBinding) binding.lifecycleOwner = thisRef.viewLifecycleOwner
      }
}

是否和这个有关系？

fun <T, VB : ViewBinding> RecyclerView.onBindAdapter(itemBind: (BaseBindingQuickAdapter.BaseBindingHolder, T) -> Unit){ val bindingAdapter by lazy { object :BaseBindingQuickAdapter<T, VB >(){ override fun convert(holder: BaseBindingHolder, item: T) { itemBind.invoke(holder,item) } } } this.adapter=bindingAdapter }

layout file:

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    >

  <com.github.piasy.biv.view.BigImageView
      android:id="@+id/ivImg"
      android:layout_width="match_parent"
      android:layout_height="match_parent"/>

</FrameLayout>

配合Multitype的基类封装,BigImageView换成其他View都正常..但是就是com.github.piasy.biv.view.BigImageView会出这个错 但是在配合fragment封装的基类使用也没有问题

我在使用的时候出现这个问题，它提示我以下错误信息： Cannot inline bytecode built with JVM target 1.8 into bytecode that is being built with JVM target 1.6. Please specify proper '-jvm-target' option 但是我运行的时候他没有任何问题。 而且在app -> build.gradle 中添加了以下代码，并没有什么用。

下划线后备属性本意是为了 延迟初始化。但是这里by委托类 getValue本身就近似达到了延迟初始化的要求

且binding的get()方法并无特殊功用，没有体现后备属性的用法，

看起来使用后备属性仅仅是不想多写!!而已

看我的图。我实在不知道不知道为什么会多写两行，虽然对 后备属性私有访问，编译器是可以不调用getter方法，无函数调用损耗，但是多写这个我认为无用的代码，我实在看着别扭，往大佬打脸指教下。

为了这个细小问题，我搜索看了好多文章对于后备字段，后备属性，支持属性，延迟初始化，惰性初始化的讲解，最后汇总还是感觉图上的委托类，getvalue方法中对后备属性的使用时多余的很，这个问题我在 很多地方见到过，比如

张鸿阳kotlin-android-extensions 插件也被废弃了？扶我起来一文中 对viewbing在fragment中的初始化也是用的后备属性，我对此写法的看法是优点在于后面在使用viewbing字段的时候不用每次都写!!毕竟fragment中对viewbing的调用可能有很多次，省下!!也是值得的，

所以大佬你的委托类不对外开放，却使用了后备属性节约了一点点 对!!的书写，实在感觉怪怪的。

这个问题困扰我好久了，大佬抽出时间解答探讨下，就不胜感激了！！

不建议这么使用 thisRef.viewLifecycleOwner.lifecycle.addObserver(object : LifecycleObserver { @OnLifecycleEvent(Lifecycle.Event.ON_DESTROY) fun onDestroyView() { Log.e("taggg", "onDestroyView viewLifecycleOwner$this") _binding = null } }) 因为这会导致比fragment更快的执行onDestroyView方法

E/AndroidRuntime: FATAL EXCEPTION: main Process: com.android.sms, PID: 4568 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.android.sms/com.android.sms.ui.splash.SplashActivity}: java.lang.IllegalArgumentException: There is no generic of ViewBinding. at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3752) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3920) at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:85) at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135) at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2345) at android.os.Handler.dispatchMessage(Handler.java:106) at android.os.Looper.loop(Looper.java:264) at android.app.ActivityThread.main(ActivityThread.java:8268) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:632) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1049) Caused by: java.lang.IllegalArgumentException: There is no generic of ViewBinding. at p1.a.b(ViewBindingUtil.kt:90) at p1.a.a(ViewBindingUtil.kt:35) at cc.jianke.mvvmmodule.viewbinding.BaseViewBindingActivity.onCreate(BaseViewBindingActivity.kt:20) at android.app.Activity.performCreate(Activity.java:8151) at android.app.Activity.performCreate(Activity.java:8135) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1309) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3721) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3920)  at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:85)  at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)  at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2345)  at android.os.Handler.dispatchMessage(Handler.java:106)  at android.os.Looper.loop(Looper.java:264)  at android.app.ActivityThread.main(ActivityThread.java:8268)  at java.lang.reflect.Method.invoke(Native Method)  at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:632)  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1049) 

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.vis.ls/com.wzg.watermarkCamera.CameraActivity}: java.lang.reflect.InvocationTargetException at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3308) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3457) at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83) at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135) at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2044) at android.os.Handler.dispatchMessage(Handler.java:107) at android.os.Looper.loop(Looper.java:224) at android.app.ActivityThread.main(ActivityThread.java:7560) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:950) Caused by: java.lang.reflect.InvocationTargetException at java.lang.reflect.Method.invoke(Native Method) at com.dylanc.viewbinding.base.ViewBindingUtil$inflateBindingWithGeneric$1.invoke(ViewBindingUtil.kt:36) at com.dylanc.viewbinding.base.ViewBindingUtil$inflateBindingWithGeneric$1.invoke(ViewBindingUtil.kt:35) at com.dylanc.viewbinding.base.ViewBindingUtil.withGenericBindingClass(ViewBindingUtil.kt:71) at com.dylanc.viewbinding.base.ViewBindingUtil.inflateWithGeneric(ViewBindingUtil.kt:35) at com.wzg.watermarkCamera.BindingActivity.onCreate(BindingActivity.java:24) at com.wzg.watermarkCamera.CameraActivity.onCreate(CameraActivity.java:69) at android.app.Activity.performCreate(Activity.java:7899) at android.app.Activity.performCreate(Activity.java:7886)