我正在尝试查看包含一些自定义视图的xml布局的预览（没有复杂的...主要是包装器）。我收到以下错误：
The following classes could not be instantiated:
- com.app.view.widget.SlidingSwipeRefreshLayout (Open Class, Show Exception, Clear Cache)
- com.app.view.widget.BetterViewAnimator (Open Class, Show Exception, Clear Cache)
java.lang.ClassFormatError: This JVM does not support constant tag 15 in class file <Unknown>
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(ClassLoader.java:637)
at java.lang.ClassLoader.defineClass(ClassLoader.java:621)
at java.lang.ClassLoader.defineClass(ClassLoader.java:471)
at com.android.tools.idea.rendering.RenderClassLoader.loadClass(RenderClassLoader.java:150)
at com.android.tools.idea.rendering.RenderClassLoader.loadClassFile(RenderClassLoader.java:125)
at org.jetbrains.android.uipreview.ModuleClassLoader.loadClassFile(ModuleClassLoader.java:287)
at com.android.tools.idea.rendering.RenderClassLoader.loadClassFromClassPath(RenderClassLoader.java:118)
at org.jetbrains.android.uipreview.ModuleClassLoader.loadClassFromModule(ModuleClassLoader.java:202)
at org.jetbrains.android.uipreview.ModuleClassLoader.loadClassFromModuleOrDependency(ModuleClassLoader.java:136)
at org.jetbrains.android.uipreview.ModuleClassLoader.load(ModuleClassLoader.java:122)
at com.android.tools.idea.rendering.RenderClassLoader.findClass(RenderClassLoader.java:53)
at org.jetbrains.android.uipreview.ModuleClassLoader.findClass(ModuleClassLoader.java:84)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at org.jetbrains.android.uipreview.ViewLoader.loadClass(ViewLoader.java:182)
at org.jetbrains.android.uipreview.ViewLoader.loadView(ViewLoader.java:101)
at com.android.tools.idea.rendering.LayoutlibCallback.loadView(LayoutlibCallback.java:177)
at android.view.BridgeInflater.loadCustomView(BridgeInflater.java:207)
at android.view.BridgeInflater.createViewFromTag(BridgeInflater.java:132)
at android.view.LayoutInflater.inflate(LayoutInflater.java:482)
at android.view.LayoutInflater.inflate(LayoutInflater.java:385)
at com.android.layoutlib.bridge.impl.RenderSessionImpl.inflate(RenderSessionImpl.java:400)
at com.android.layoutlib.bridge.Bridge.createSession(Bridge.java:332)
at com.android.ide.common.rendering.LayoutLibrary.createSession(LayoutLibrary.java:350)
at com.android.tools.idea.rendering.RenderTask$2.compute(RenderTask.java:497)
at com.android.tools.idea.rendering.RenderTask$2.compute(RenderTask.java:485)
at com.intellij.openapi.application.impl.ApplicationImpl.runReadAction(ApplicationImpl.java:894)
at com.android.tools.idea.rendering.RenderTask.createRenderSession(RenderTask.java:485)
at com.android.tools.idea.rendering.RenderTask.render(RenderTask.java:590)
at org.jetbrains.android.uipreview.AndroidLayoutPreviewToolWindowManager.doRender(AndroidLayoutPreviewToolWindowManager.java:644)
at org.jetbrains.android.uipreview.AndroidLayoutPreviewToolWindowManager.access$1700(AndroidLayoutPreviewToolWindowManager.java:79)
at org.jetbrains.android.uipreview.AndroidLayoutPreviewToolWindowManager$7$1.run(AndroidLayoutPreviewToolWindowManager.java:586)
at com.intellij.openapi.progress.impl.CoreProgressManager$2.run(CoreProgressManager.java:152)
at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:452)
at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:402)
at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:54)
at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:137)
at org.jetbrains.android.uipreview.AndroidLayoutPreviewToolWindowManager$7.run(AndroidLayoutPreviewToolWindowManager.java:581)
at com.intellij.util.ui.update.MergingUpdateQueue.execute(MergingUpdateQueue.java:320)
at com.intellij.util.ui.update.MergingUpdateQueue.execute(MergingUpdateQueue.java:310)
at com.intellij.util.ui.update.MergingUpdateQueue$2.run(MergingUpdateQueue.java:254)
at com.intellij.util.ui.update.MergingUpdateQueue.flush(MergingUpdateQueue.java:269)
at com.intellij.util.ui.update.MergingUpdateQueue.flush(MergingUpdateQueue.java:227)
at com.intellij.util.ui.update.MergingUpdateQueue.run(MergingUpdateQueue.java:217)
at com.intellij.util.concurrency.QueueProcessor.runSafely(QueueProcessor.java:238)
at com.intellij.util.Alarm$Request$1.run(Alarm.java:351)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:439)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
at java.lang.Thread.run(Thread.java:695)
是否有建议的修复程序？我尝试过典型的清洁/重建和重新启动Android Studio。
答案 0 :(得分：13)
如果你的自定义视图类中有lambda，那么你需要在Java 8下运行Android Studio。根据tools.android.com，你可以通过设置STUDIO_JDK环境变量来实现。
如果您使用的是Mac，则可以设置此环境变量，以便Android Studio通过运行以下内容始终使用它：
launchctl setenv STUDIO_JDK /Library/Java/JavaVirtualMachines/jdk1.8.0_45.jdk
（根据您的实际JDK位置进行调整。）