Android Studio-Vorschau: Diese JVM unterstützt keine Konstanten Tag 15

Question

Ich versuche, eine Vorschau eines XML-Layouts zu sehen, das ein paar benutzerdefinierte Ansichten enthält (nichts Kompliziertes ... meist Wrapper). Ich erhalte den folgenden Fehler:

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) 

Gibt es eine vorgeschlagene Lösung dafür? Ich habe versucht, Android Studio zu säubern/neu aufzubauen und neu zu starten.

Answer 1

Wenn Sie Lambdas in Ihrer benutzerdefinierten Ansichtsklasse haben, müssen Sie Android Studio unter Java 8 ausführen. Gemäß tools.android.com können Sie dazu die Umgebungsvariable STUDIO_JDK festlegen.

Wenn Sie auf einem Mac sind, können Sie diese Umgebungsvariable gesetzt, so dass es immer von Android Studio, indem Sie die verwendet wird, folgende:

launchctl setenv STUDIO_JDK /Library/Java/JavaVirtualMachines/jdk1.8.0_45.jdk

(. Passen Sie entsprechend Ihrer tatsächlichen JDK Standort)