NullPointerException on render android layout

Question

Any layout in my android project, generate a render exception:

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

Switching the preview rendering target from 22 to 21 made the error go away for me on Android Studio 1.2 Stable.

Answer 2

I got this error on the latest version of AS as of today, but for a different reason.

I renamed one of my app themes, then in all of the activity layout files that I had manually selected that theme for (in the theme drop down menu on the preview window), I was getting this error.

Once I realized this was the problem, I easily fixed it by just changing the theme to a valid/existing theme. Again I'm not talking about changing the defined theme for the activity, I'm talking about changing the PREVIEW theme.

Answer 3

This is a bug in Android Studio Beta 1.2. After upgrading to 1.3, this does not occur