我最近安装的Eclipse IDE for Java Developers的（版本：3.6.1）的Andr​​oid SDK平台2.1update1 - 在Windows 7

I have recently installed Eclipse IDE for Java Developers (Version: 3.6.1) with the Android SDK Platform 2.1update1 - on Windows 7.

我可以添加，编辑和运行code的项目，但是，在工作台区域布局的XML文件的图形布局视图始终显示一个丢失的主题，在右下角的导航area.The消息左侧面板导航仪面积是确定的，剩下的区域是空白。

I can add, edit and run code for projects, however, in the Workbench area the Graphical Layout view of the layout xml files always shows a "missing theme" message in bottom right navigation area.The left Palette navigator area is ok and the remaining area is blank.

该错误消息如下：选择页'0'AndroidXmlEditor失败

The error message reads: "Selecting page '0' in AndroidXmlEditor failed"

The first and last 10 lines from the Exception Stack Trace reads:
java.lang.NullPointerException
at com.android.ide.eclipse.adt.internal.editors.layout.gle2.Gra phicalEditorPart.renderWithBridge(Unknown Source)
at com.android.ide.eclipse.adt.internal.editors.layout.gle2.Gra phicalEditorPart.recomputeLayout(Unknown Source)
at com.android.ide.eclipse.adt.internal.editors.layout.gle2.Gra phicalEditorPart.activated(Unknown Source)
at com.android.ide.eclipse.adt.internal.editors.layout.LayoutEd itor.pageChange(Unknown Source)
at org.eclipse.ui.part.MultiPageEditorPart.setActivePage(MultiP ageEditorPart.java:1067)
at org.eclipse.ui.forms.editor.FormEditor.setActivePage(FormEdi tor.java:607)
at com.android.ide.eclipse.adt.internal.editors.AndroidXmlEdito r.selectDefaultPage(Unknown Source)
at com.android.ide.eclipse.adt.internal.editors.AndroidXmlEdito r.addPages(Unknown Source)
at org.eclipse.ui.forms.editor.FormEditor.createPages(FormEdito r.java:138)
at org.eclipse.ui.part.MultiPageEditorPart.createPartControl(Mu ltiPageEditorPart.java:348)

at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher .start(EclipseAppLauncher.java:79)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseS tarter.java:369)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseS tarter.java:179)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java: 619)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:574)
at org.eclipse.equinox.launcher.Main.run(Main.java:1407)

感谢您的帮助提前。

Thanks for your help in advance.

推荐答案

在布局编辑器的图形布局选项卡中有一个下拉选择Android版本使用。在你的情况可能是空白的，所以选择一个版本，你可能好到哪里去。

In the "Graphical Layout" tab of the layout editor there is a dropdown for selecting the Android version to use. In your case it is probably blank, so select a version and you're probably good to go.