在构建android项目时出现我不理解的错误消息

Question

我已经搜索了论坛，但没有一个解决方案可以解决我的问题。我无法编译我的项目。我得到了这个错误，然后是：

Description Resource Path Location Type
Project 'videothumb' is missing required source folder: 'gen' videothumb Build path
Build Path Problem
The project cannot be built until build path errors are resolved videothumb Unknown    
Java Problem
Unable to resolve target 'android-5' until the SDK is loaded. MojoGBAMulti Unknown    
Android Target Problem
Unable to resolve target 'android-5' until the SDK is loaded. MojoGBAMulti Unknown
Android Target Problem
R cannot be resolved image.java /ImageThumbnailsActivity/src/image/Thumbnailsline27    
Java Problem
R cannot be resolved image.java /ImageThumbnailsActivity/src/image/Thumbnailsline36
Java Problem
R cannot be resolved MediaPlayerDemo.java /Media/src/media/media line49 Java Problem
R cannot be resolved MediaPlayerDemo.java /Media/src/media/media line50 Java Problem
R cannot be resolved MediaPlayerDemo.java /Media/src/media/media line52 Java Problem
R cannot be resolved MediaPlayerDemo.java /Media/src/media/media line56 Java Problem
R cannot be resolved MediaPlayerDemo_Audio.java /Media/src/media/media line80    
Java Problem
R cannot be resolved MediaPlayerDemo_Video.java /Media/src/media/media line106    
Java Problem
R cannot be resolved MediaPlayerDemo_Video.java /Media/src/media/media line107    
Java Problem
R cannot be resolved MediaPlayerDemo_Video.java /Media/src/media/media line112    
Java Problem
R cannot be resolved MediaPlayerDemo_Video.java /Media/src/media/media line114    
Java Problem
R cannot be resolved MediaPlayerDemo_Video.java /Media/src/media/media line116    
Java Problem
R cannot be resolved MediaPlayerDemo_Video.java /Media/src/media/media line118 
Java Problem
R cannot be resolved MediaPlayerDemo_Video.java /Media/src/media/media line120 
Java Problem
R cannot be resolved videothumb.java /Media/src/media/media    line 26    Java Problem
R cannot be resolved videothumb.java /Media/src/media/media    line 41    Java Problem

这里肯定出了问题。

你能帮帮我吗?我被卡住了..。

android应用程序的新特性...

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Answer 1

在左侧的eclipse中，在包资源管理器中右键单击项目，然后转到Build Path，然后选择configure build path。

PojectName--> BuildPath -->配置构建路径

您将看到一个带有ProjectName标题属性的窗口

在此窗口中，将在白色面板中绘制列表树，在此树中选择Java Build Path...之后，您将看到一个选项卡式窗格，其中包含4个选项卡，依次选择Order和Export选项卡。

您将看到一个带有您的目标sdk名称的复选框项，选中此选项并刷新...

这应该行得通..如果不是，那么清理项目并重新构建...

要进行清理，请转到eclipse的project菜单，选择清理，然后继续。