由于缺少Java类，Android Studio 3.1无法呈现xml文件 [英] Android Studio 3.1 does not render xml file due to a java class missing

问题描述

总是告诉我按摩中的错误

Always shows me the error in the massages

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

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

我的项目实际上是一个打招呼的世界，我只是打开android studios，然后单击空白活动，然后等待构建完成，但未渲染该应用程序. 我重新安装了android studios和JDK10.但这是行不通的.该项目在虚拟设备上显示正常，我什至可以将hello world编辑为任何字符串，但是在XML视图中，它仅显示白屏

My project is literally hello world and I just open android studios and click on the empty activity and then wait for the build to finish but it doesn't render the app. I reinstalled android studios and JDK10. but it doesn't work. the project shows fine in virtual device and i can even edit hello world to any string, but in XML view, it just shows a white screen

.

这是堆栈:

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.ActionBarContainer.<init>(ActionBarContainer.java:62)
    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:481)
    at org.jetbrains.android.uipreview.ViewLoader.loadClass(ViewLoader.java:264)
    at org.jetbrains.android.uipreview.ViewLoader.loadView(ViewLoader.java:222)
    at com.android.tools.idea.rendering.LayoutlibCallbackImpl.loadView(LayoutlibCallbackImpl.java:209)
    at android.view.BridgeInflater.loadCustomView(BridgeInflater.java:337)
    at android.view.BridgeInflater.loadCustomView(BridgeInflater.java:348)
    at android.view.BridgeInflater.createViewFromTag(BridgeInflater.java:248)
    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:730)
    at android.view.LayoutInflater.rInflate_Original(LayoutInflater.java:863)
    at android.view.LayoutInflater_Delegate.rInflate(LayoutInflater_Delegate.java:72)
    at android.view.LayoutInflater.rInflate(LayoutInflater.java:837)
    at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:824)
    at android.view.LayoutInflater.inflate(LayoutInflater.java:515)
    at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
    at com.android.layoutlib.bridge.bars.BridgeActionBar.<init>(BridgeActionBar.java:89)
    at com.android.layoutlib.bridge.bars.AppCompatActionBar.<init>(AppCompatActionBar.java:68)
    at com.android.layoutlib.bridge.impl.Layout.createActionBar(Layout.java:277)
    at com.android.layoutlib.bridge.impl.Layout.<init>(Layout.java:161)
    at com.android.layoutlib.bridge.impl.RenderSessionImpl.inflate(RenderSessionImpl.java:288)
    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)

推荐答案

是的，它发生了.您可以轻松修复它.

Yes, it happens. You can fix it easily.

第一种方法: 在Gradle脚本下打开build.gradle(Module:app)并将版本alpha3更改为 alpha1 并立即同步

First Method: Open build.gradle(Module: app) under Gradle Scripts and change version alpha3 to alpha1 and Sync now

实现'com.android.support:appcompat-v7:28.0.0-alpha1'

implementation 'com.android.support:appcompat-v7:28.0.0-alpha1'

第二种方法: 在res-> values-> style.xml下打开style.xml并更改此行

Second Method: Open style.xml under res -> values -> style.xml and change this line

style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">

将Base.放在Theme.AppCompat.Light.DarkActionBar之类的

put Base. before Theme.AppCompat.Light.DarkActionBar like

style name="AppTheme" parent="Base.Theme.AppCompat.Light.DarkActionBar">

希望问题会解决.

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