android布局错,android stuio中布局预览错误解决方法

在android studio中预览layout布局时，出现以下错误，原因是gradle 2.1版本导致的。解决方法是更换sdk版本

java.lang.NoClassDefFoundError: com/android/util/PropertiesMap     at com.android.layoutlib.bridge.android.BridgeContext.createStyleBasedTypedArray(BridgeContext.java:940)     at com.android.layoutlib.bridge.android.BridgeContext.obtainStyledAttributes(BridgeContext.java:638)     at android.content.res.Resources_Theme_Delegate.obtainStyledAttributes(Resources_Theme_Delegate.java:71)     at android.content.res.Resources$Theme.obtainStyledAttributes(Resources.java:1436)     at android.widget.TextView.(TextView.java:761)     at android.widget.TextView.(TextView.java:704)     at android.widget.TextView.(TextView.java:700)     at com.android.layoutlib.bridge.MockView.(MockView.java:50)     at com.android.layoutlib.bridge.MockView.(MockView.java:45)     at com.android.layoutlib.bridge.MockView.(MockView.java:41)     at android.view.BridgeInflater.createViewFromTag(BridgeInflater.java:163)     at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:727)     at android.view.LayoutInflater.rInflate_Original(LayoutInflater.java:858)     at android.view.LayoutInflater_Delegate.rInflate(LayoutInflater_Delegate.java:70)     at android.view.LayoutInflater.rInflate(LayoutInflater.java:834)     at android.view.LayoutInflater.inflate(LayoutInflater.java:492)     at com.android.layoutlib.bridge.bars.CustomBar.(CustomBar.java:95)     at com.android.layoutlib.bridge.bars.StatusBar.(StatusBar.java:67)     at com.android.layoutlib.bridge.impl.Layout.createStatusBar(Layout.java:222)     at com.android.layoutlib.bridge.impl.Layout.(Layout.java:144)     at com.android.layoutlib.bridge.impl.RenderSessionImpl.inflate(RenderSessionImpl.java:297)     at com.android.layoutlib.bridge.Bridge.createSession(Bridge.java:429)     at com.android.ide.common.rendering.LayoutLibrary.createSession(LayoutLibrary.java:350)     at com.android.tools.idea.rendering.RenderTask$2.compute(RenderTask.java:520)     at com.android.tools.idea.rendering.RenderTask$2.compute(RenderTask.java:508)     at com.intellij.openapi.application.impl.ApplicationImpl.runReadAction(ApplicationImpl.java:967)     at com.android.tools.idea.rendering.RenderTask.createRenderSession(RenderTask.java:508)     at com.android.tools.idea.rendering.RenderTask.access$600(RenderTask.java:75)     at com.android.tools.idea.rendering.RenderTask$3.call(RenderTask.java:620)     at com.android.tools.idea.rendering.RenderTask$3.call(RenderTask.java:617)     at com.android.tools.idea.rendering.RenderService.runRenderAction(RenderService.java:371)     at com.android.tools.idea.rendering.RenderTask.render(RenderTask.java:617)     at com.android.tools.idea.rendering.RenderTask.render(RenderTask.java:639)     at com.intellij.android.designer.designSurface.AndroidDesignerEditorPanel$7.run(AndroidDesignerEditorPanel.java:519)     at com.intellij.util.ui.update.MergingUpdateQueue.execute(MergingUpdateQueue.java:337)     at com.intellij.util.ui.update.MergingUpdateQueue.execute(MergingUpdateQueue.java:327)     at com.intellij.util.ui.update.MergingUpdateQueue$3.run(MergingUpdateQueue.java:271)     at com.intellij.util.ui.update.MergingUpdateQueue.flush(MergingUpdateQueue.java:286)     at com.intellij.util.ui.update.MergingUpdateQueue.flush(MergingUpdateQueue.java:244)     at com.intellij.util.ui.update.MergingUpdateQueue.run(MergingUpdateQueue.java:234)     at com.intellij.util.concurrency.QueueProcessor.runSafely(QueueProcessor.java:238)     at com.intellij.util.Alarm$Request$1.run(Alarm.java:352)     at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)     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)