android - java.lang.ClassNotFoundException : android. View .View$OnUnhandledKeyEventListener

Question

当我尝试将 ImageView 添加到 Android Studio 的布局编辑器时，它没有显示，而且还显示了一些错误

Java

java.lang.ClassNotFoundException: android.view.View$OnUnhandledKeyEventListener
    at org.jetbrains.android.uipreview.ModuleClassLoader.load(ModuleClassLoader.java:180)
    at com.android.tools.idea.rendering.RenderClassLoader.findClass(RenderClassLoader.java:61)
    at org.jetbrains.android.uipreview.ModuleClassLoader.findClass(ModuleClassLoader.java:118)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    at org.jetbrains.android.uipreview.ModuleClassLoader.loadClass(ModuleClassLoader.java:213)
    at android.support.v7.widget.GridLayout.isLayoutRtlCompat(GridLayout.java:679)
    at android.support.v7.widget.GridLayout.onLayout_Original(GridLayout.java:1082)
    at android.support.v7.widget.GridLayout.onLayout(GridLayout.java)
    at android.view.View.layout_Original(View.java:19659)
    at android.view.View_Delegate.layout(View_Delegate.java:91)
    at android.view.View.layout(View.java:19645)
    at android.view.ViewGroup.layout(ViewGroup.java:6075)
    at android.support.constraint.ConstraintLayout.onLayout_Original(ConstraintLayout.java:1858)
    at android.support.constraint.ConstraintLayout.onLayout(ConstraintLayout.java)
    at android.view.View.layout_Original(View.java:19659)
    at android.view.View_Delegate.layout(View_Delegate.java:91)
    at android.view.View.layout(View.java:19645)
    at android.view.ViewGroup.layout(ViewGroup.java:6075)
    at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
    at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
    at android.view.View.layout_Original(View.java:19659)
    at android.view.View_Delegate.layout(View_Delegate.java:91)
    at android.view.View.layout(View.java:19645)
    at android.view.ViewGroup.layout(ViewGroup.java:6075)
    at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1083)
    at android.view.View.layout_Original(View.java:19659)
    at android.view.View_Delegate.layout(View_Delegate.java:91)
    at android.view.View.layout(View.java:19645)
    at android.view.ViewGroup.layout(ViewGroup.java:6075)
    at com.android.layoutlib.bridge.impl.RenderSessionImpl.inflate(RenderSessionImpl.java:346)
    at com.android.layoutlib.bridge.Bridge.createSession(Bridge.java:384)
    at com.android.tools.idea.layoutlib.LayoutLibrary.createSession(LayoutLibrary.java:193)
    at com.android.tools.idea.rendering.RenderTask.createRenderSession(RenderTask.java:544)
    at com.android.tools.idea.rendering.RenderTask.lambda$inflate$3(RenderTask.java:678)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)

显示 UnhandledKeyEventListener 错误

Answer 1

在您的 build.gradle(应用级别) 中进行更改以降级到版本 27，如下所示。然后同步并构建项目。希望它能解决这个问题..

compileSdkVersion 27

targetSdkVersion 27

实现 'com.android.support:appcompat-v7:27.1.1'