我创建了一个自定义属性,专门用于保存需要为我的一个项目调用 invalidate() 的视图属性:
class InvalidatingProperty<T>(private var _value: T) {
operator fun getValue(thisRef: View, property: KProperty<*>): T {
return _value
}
operator fun setValue(thisRef: View, property: KProperty<*>, value: T) {
_value = value
thisRef.invalidate()
}
}
Run Code Online (Sandbox Code Playgroud)
在另一个项目中,我想重用我以前的一些工作,所以我将视图及其依赖项(包括 InvalidatingProperty)复制到一个新项目中。但在新项目中,使用 InvalidatingProperty 会导致预览渲染失败,并出现以下异常:
java.lang.NoSuchMethodError: kotlin.jvm.internal.MutablePropertyReference1Impl.<init>(Ljava/lang/Class;Ljava/lang/String;Ljava/lang/String;I)V
at com.gradesimulator.views.SummaryView.<clinit>(SummaryView.kt)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at org.jetbrains.android.uipreview.ViewLoader.createNewInstance(ViewLoader.java:403)
at org.jetbrains.android.uipreview.ViewLoader.loadClass(ViewLoader.java:186)
at org.jetbrains.android.uipreview.ViewLoader.loadView(ViewLoader.java:144)
at com.android.tools.idea.rendering.LayoutlibCallbackImpl.loadView(LayoutlibCallbackImpl.java:309)
at android.view.BridgeInflater.loadCustomView(BridgeInflater.java:416)
at android.view.BridgeInflater.loadCustomView(BridgeInflater.java:427)
at android.view.BridgeInflater.createViewFromTag(BridgeInflater.java:331)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:961)
at android.view.LayoutInflater.rInflate_Original(LayoutInflater.java:1123)
at android.view.LayoutInflater_Delegate.rInflate(LayoutInflater_Delegate.java:72)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:1097)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:1084)
at android.view.LayoutInflater.inflate(LayoutInflater.java:682)
at android.view.LayoutInflater.inflate(LayoutInflater.java:501) …Run Code Online (Sandbox Code Playgroud)