Rendering Problems The following classes could not be instantiated: xml布局文件无法加载问题

最新推荐文章于 2023-01-11 13:41:28 发布

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本文详细解析了在Android开发中遇到的布局预览问题，特别是关于WindowDecorActionBar的实例化错误，提供了具体的错误信息及解决方案，即修改styles.xml文件中的主题继承方式。

Rendering Problems The following classes could not be instantiated:
- android.support.v7.app.WindowDecorActionBar (Open Class, Show Exception, Clear Cache)
 Tip: Use View.isInEditMode() in your custom views to skip code or show sample data when shown in the IDE.  If this is an unexpected error you can also try to build the project, then manually refresh the layout.

java.lang.NullPointerException
	at android.support.v7.app.WindowDecorActionBar.getDecorToolbar(WindowDecorActionBar.java:241)
	at android.support.v7.app.WindowDecorActionBar.init(WindowDecorActionBar.java:197)
	at android.support.v7.app.WindowDecorActionBar.<init>(WindowDecorActionBar.java:189)
	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:465)
	at org.jetbrains.android.uipreview.ViewLoader.loadClass(ViewLoader.java:172)
	at org.jetbrains.android.uipreview.ViewLoader.loadView(ViewLoader.java:105)
	at com.android.tools.idea.rendering.LayoutlibCallbackImpl.loadView(LayoutlibCallbackImpl.java:186)
	at com.android.layoutlib.bridge.bars.AppCompatActionBar.<init>(AppCompatActionBar.java:89)
	at com.android.layoutlib.bridge.impl.Layout.createActionBar(Layout.java:238)
	at com.android.layoutlib.bridge.impl.Layout.<init>(Layout.java:150)
	at com.android.layoutlib.bridge.impl.RenderSessionImpl.inflate(RenderSessionImpl.java:301)
	at com.android.layoutlib.bridge.Bridge.createSession(Bridge.java:429)
	at com.android.ide.common.rendering.LayoutLibrary.createSession(LayoutLibrary.java:389)
	at com.android.tools.idea.rendering.RenderTask$2.compute(RenderTask.java:548)
	at com.android.tools.idea.rendering.RenderTask$2.compute(RenderTask.java:533)
	at com.intellij.openapi.application.impl.ApplicationImpl.runReadAction(ApplicationImpl.java:966)
	at com.android.tools.idea.rendering.RenderTask.createRenderSession(RenderTask.java:533)
	at com.android.tools.idea.rendering.RenderTask.lambda$inflate$72(RenderTask.java:659)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)

修改 res/values/styles.xml目录下：

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

为：

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