Android(安卓)1.5 在eclipse中出现：Internal Error错误解决防范

今天莫名其妙的Android项目在eclipse下就报错了，报错类型为：

ErrorLog中显示：

Internal Error

Java Model Exception: Java Model Status [gen [in HelloAndroid] does not exist]

Problems中显示：

Description    Resource    Path    Location    Type
Project 'HelloAndroid' is missing required source folder: 'gen'    HelloAndroid        Build path    Build Path Problem

clean projected也不行，还是报错，但是gen和R.java都是存在的，这个可能是adt的bug。

后来折腾了半天解决了解决办法为：

1.在eclipse中删除gen文件夹 Delete the R.java file under the gen folder

2.刷新项目，此时一般情况选择了自动编译的会自动生成gen的现在出问题了没有自动生成 Refresh the project

3.选择project-build project 编译项目就可以了最好将project –auto building 勾选上。Build Project, not Clean

出现问题还可能采用的解决办法有

检查java compiler中使用的jdk 可以更换下试试先跟换为1.5，编译一遍然后更换回1.6试试

检查Android Sdk 模拟器版本重新设置试试看，

详细错误内容：

eclipse.buildId=I20090611-1540
java.version=1.6.0_07
java.vendor=Sun Microsystems Inc.
BootLoader constants: OS=win32, ARCH=x86, WS=win32, NL=zh_CN
Framework arguments: -product org.eclipse.epp.package.jee.product -product org.eclipse.epp.package.jee.product
Command-line arguments: -os win32 -ws win32 -arch x86 -product org.eclipse.epp.package.jee.product -data D:\ByreadSourse -product org.eclipse.epp.package.jee.product

Error
Sat Jun 26 13:21:23 CST 2010
Internal Error

Java Model Exception: Java Model Status [gen [in HelloAndroid] does not exist]
    at org.eclipse.jdt.internal.core.JavaElement.newJavaModelException(JavaElement.java:502)
    at org.eclipse.jdt.internal.core.Openable.generateInfos(Openable.java:246)
    at org.eclipse.jdt.internal.core.JavaElement.openWhenClosed(JavaElement.java:515)
    at org.eclipse.jdt.internal.core.JavaElement.getElementInfo(JavaElement.java:252)
    at org.eclipse.jdt.internal.core.JavaElement.getElementInfo(JavaElement.java:238)
    at org.eclipse.jdt.internal.core.PackageFragmentRoot.getKind(PackageFragmentRoot.java:477)
    at org.eclipse.jdt.internal.ui.packageview.PackageExplorerContentProvider.processDelta(PackageExplorerContentProvider.java:645)
    at org.eclipse.jdt.internal.ui.packageview.PackageExplorerContentProvider.handleAffectedChildren(PackageExplorerContentProvider.java:791)
    at org.eclipse.jdt.internal.ui.packageview.PackageExplorerContentProvider.processDelta(PackageExplorerContentProvider.java:734)
    at org.eclipse.jdt.internal.ui.packageview.PackageExplorerContentProvider.handleAffectedChildren(PackageExplorerContentProvider.java:791)
    at org.eclipse.jdt.internal.ui.packageview.PackageExplorerContentProvider.processDelta(PackageExplorerContentProvider.java:734)
    at org.eclipse.jdt.internal.ui.packageview.PackageExplorerContentProvider.elementChanged(PackageExplorerContentProvider.java:124)
    at org.eclipse.jdt.internal.core.DeltaProcessor$3.run(DeltaProcessor.java:1557)
    at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
    at org.eclipse.jdt.internal.core.DeltaProcessor.notifyListeners(DeltaProcessor.java:1547)
    at org.eclipse.jdt.internal.core.DeltaProcessor.firePostChangeDelta(DeltaProcessor.java:1381)
    at org.eclipse.jdt.internal.core.DeltaProcessor.fire(DeltaProcessor.java:1357)
    at org.eclipse.jdt.internal.core.DeltaProcessor.resourceChanged(DeltaProcessor.java:1958)
    at org.eclipse.jdt.internal.core.DeltaProcessingState.resourceChanged(DeltaProcessingState.java:470)
    at org.eclipse.core.internal.events.NotificationManager$2.run(NotificationManager.java:291)
    at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
    at org.eclipse.core.internal.events.NotificationManager.notify(NotificationManager.java:285)
    at org.eclipse.core.internal.events.NotificationManager.broadcastChanges(NotificationManager.java:149)
    at org.eclipse.core.internal.resources.Workspace.broadcastPostChange(Workspace.java:313)
    at org.eclipse.core.internal.resources.Workspace.endOperation(Workspace.java:1022)
    at org.eclipse.core.internal.resources.InternalWorkspaceJob.run(InternalWorkspaceJob.java:45)
    at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)

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