Android Studio渲染xml布局时的空指针异常

昨天我正在对我的应用程序进行一些更改，具体是ActionBar颜色，我工作得很完美，我能够毫无问题地在android studio上预览并在我的设备上运行完美，但今天早上当我打开机器人工作室，它不会预览和被扔这个异常：Android Studio渲染xml布局时的空指针异常

java.lang.NullPointerException 
    at android.graphics.Bitmap_Delegate.createBitmap(Bitmap_Delegate.java:599) 
    at android.graphics.Bitmap_Delegate.createBitmap(Bitmap_Delegate.java:120) 
    at android.graphics.Bitmap_Delegate.createBitmap(Bitmap_Delegate.java:102) 
    at com.android.layoutlib.bridge.impl.ResourceHelper.getDrawable(ResourceHelper.java:236) 
    at com.android.layoutlib.bridge.bars.ActionBarLayout.getDrawable(ActionBarLayout.java:222) 
    at com.android.layoutlib.bridge.bars.ActionBarLayout.setupActionBar(ActionBarLayout.java:160) 
    at com.android.layoutlib.bridge.bars.ActionBarLayout.<init>(ActionBarLayout.java:127) 
    at com.android.layoutlib.bridge.impl.RenderSessionImpl.createActionBar(RenderSessionImpl.java:1627) 
    at com.android.layoutlib.bridge.impl.RenderSessionImpl.inflate(RenderSessionImpl.java:355) 
    at com.android.layoutlib.bridge.Bridge.createSession(Bridge.java:329) 
    at com.android.ide.common.rendering.LayoutLibrary.createSession(LayoutLibrary.java:332) 
    at com.android.tools.idea.rendering.RenderService$3.compute(RenderService.java:575) 
    at com.android.tools.idea.rendering.RenderService$3.compute(RenderService.java:564) 
    at com.intellij.openapi.application.impl.ApplicationImpl.runReadAction(ApplicationImpl.java:932) 
    at com.android.tools.idea.rendering.RenderService.createRenderSession(RenderService.java:564) 
    at com.android.tools.idea.rendering.RenderService.render(RenderService.java:691) 
    at org.jetbrains.android.uipreview.AndroidLayoutPreviewToolWindowManager.doRender(AndroidLayoutPreviewToolWindowManager.java:604) 
    at org.jetbrains.android.uipreview.AndroidLayoutPreviewToolWindowManager.access$1900(AndroidLayoutPreviewToolWindowManager.java:80) 
    at org.jetbrains.android.uipreview.AndroidLayoutPreviewToolWindowManager$7$1.run(AndroidLayoutPreviewToolWindowManager.java:546) 
    at com.intellij.openapi.progress.impl.ProgressManagerImpl$2.run(ProgressManagerImpl.java:178) 
    at com.intellij.openapi.progress.ProgressManager.executeProcessUnderProgress(ProgressManager.java:209) 
    at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:212) 
    at com.intellij.openapi.progress.impl.ProgressManagerImpl.runProcess(ProgressManagerImpl.java:171) 
    at org.jetbrains.android.uipreview.AndroidLayoutPreviewToolWindowManager$7.run(AndroidLayoutPreviewToolWindowManager.java:541) 
    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$1.run(Alarm.java:327) 
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) 
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334) 
    at java.util.concurrent.FutureTask.run(FutureTask.java:166) 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) 
    at java.lang.Thread.run(Thread.java:722)

所有的活动甚至是空的原因，这个问题

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:tools="http://schemas.android.com/tools" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
android:paddingLeft="@dimen/activity_horizontal_margin" 
android:paddingRight="@dimen/activity_horizontal_margin" 
android:paddingTop="@dimen/activity_vertical_margin" 
android:paddingBottom="@dimen/activity_vertical_margin" 
tools:context="com.andujardev.money.AccountCreator"> 
</RelativeLayout>

渲染预览

012时抛出异常

有帮助吗？

询问是否需要更多的信息

编辑：出于某种原因，错误必须做的动作吧，因为我有一个布局，这并不表明操作栏，它可以正常渲染，我只是不能找到问题出在哪里，因为程序可以随时编译和运行。

来源

2014-09-10 Daniel Andujar

没有XML和没有Java代码我怎么知道.....哪里是空指针异常.......张贴代码将是伟大的想法 – KOTIOS 2014-09-10 17:11:40

你做了什么调试呢？ – Shawn 2014-09-10 17:12:38

它显示在xml预览屏幕上，重点在于，即使是空的空白布局（基本 ...）也会抛出此异常。但它编译运行在我的手机 – 2014-09-10 17:26:20