渲染android布局的NullPointerException

Question

我的android项目中的任何布局都会生成渲染异常:

Android Studio 1.2 Beta

java.lang.NullPointerException
    at com.android.layoutlib.bridge.impl.RenderSessionImpl.isThemeAppCompat(RenderSessionImpl.java:1203)
    at com.android.layoutlib.bridge.impl.RenderSessionImpl.findStatusBar(RenderSessionImpl.java:1066)
    at com.android.layoutlib.bridge.impl.RenderSessionImpl.init(RenderSessionImpl.java:209)
    at com.android.layoutlib.bridge.Bridge.createSession(Bridge.java:319)
    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 com.intellij.android.designer.designSurface.AndroidDesignerEditorPanel$6.run(AndroidDesignerEditorPanel.java:480)
    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:471)
    at java.util.concurrent.FutureTask.run(FutureTask.java:262)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:745)

Answer 1

将预览渲染目标从22切换到21使得Android Studio 1.2 Stable上的错误消失了.

Answer 2

我在今天的AS的最新版本上遇到此错误,但原因不同.

我重命名了我的一个应用主题,然后在我手动选择该主题的所有活动布局文件中(在预览窗口的主题下拉菜单中),我收到了此错误.

一旦我意识到这是问题,我只需将主题更改为有效/现有主题即可轻松修复它.我不是在谈论为活动更改已定义的主题,而是在谈论更改PREVIEW主题.