blocks|key|241038|text|看起来你缺少JDK+(java.lang.Object来自于JDK)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|241039|问题是你在不同的PC上使用相同的Android+API。Eclipse会丢失，路径名不同，但具有相同的API。|241040|要解决这个问题，首先重新选择Android+API版本(设置为另一个有效版本，然后恢复您想要的，并验证它的->它将强制Eclipse重新加载API)。然后进入project->properties->+java+build+path。然后删除"Unable+to+get+system+library+for+the+project“，再删除"Add+library”，并选择"Android+Classpath+container“。|241041|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

It seems that you lack JDK (java.lang.Object comes from there )

The problem is that you used the same Android API on different PC. Eclipse is lost with path names that are differents but with same API.

To solve it, first re-select Android API version (set to another one and valid, then restore the on you want and validate it -> it will force Eclipse to reload API).
Then go into project->properties-> java build path. Then remove "Unable to get system library for the project" then "Add library" and select "Android Classpath container".

blocks|key|3119593|text|右键单击项目->属性->+Java构建路径(从左侧列表开始)+->库(选项卡)+->添加库(右侧按钮)+->+JRE系统库->+Next+->工作区默认JRE+->完成|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3119594|这至少可以解决你的一个错误。任何其他库都可能需要您添加更多的库。|3119595|希望这能有所帮助。|3119596|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

Right click on project -> Properties -> Java Build Path (From Left List) -> Libraries (Tab) -> Add Library (Button on right) -> JRE System Library -> Next -> Workspace default JRE -> Finish

This should solve at least one of your errors. Any others might require you to add further libraries.

Hope this helps.

blocks|key|241138|text|关闭eclipse并重新打开对我来说很有效。您可能需要这样做两三次。每次给它一分钟让自动构建启动过程(检查右下角)完成，因为这些错误在这个时候通常会消失。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|241139|或者尝试清理受影响的项目。|241140|“关机再开机”|241141|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|H|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|I|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|J|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|G|$]]

Close eclipse and re-open worked for me. You may have to do this two or three times. Each time give it a minute for the auto build startup process (check bottom right hand corner) to complete, as these errors often disappear at this time. 

Or try to clean the affected projects.

'Turn it off and on again'

blocks|key|235789|text|最初，我试图从github导入一个android项目，遇到了上面的问题|type|unstyled|depth|inlineStyleRanges|entityRanges|data|235790|235791|无法配置生成路径|unordered-list-item|235792|unable+to+get+system+libraries|235793|235794|235795|235796|包资源管理器->右键单击项目->“属性”->+"Android“->”项目构建目标“=+2.3.3|blockquote|235797|235798|235799|注意:也可以尝试清理(在Window上:+Project+->清理)，然后随机刷新(F5)。这很有可能会神奇地解决你所有的问题。|235800|235801|礼节：KYLE+CLEGG|offset|length|235802|reference+link|235803|entityMap|0|LINK|mutability|MUTABLE|url|http://kyleclegg.com/|1|http://kyleclegg.com/android-requires-compiler-compliance-level-5-0/^0|0|0|0|0|0|0|0|0|0|0|0|0|3|A|0|0|0|E|1|0^^$0|@$1|2|3|4|5|6|7|18|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|19|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|1A|8|@]|9|@]|A|$]]|$1|F|3|G|5|E|7|1B|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|1C|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|1D|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|1E|8|@]|9|@]|A|$]]|$1|K|3|L|5|M|7|1F|8|@]|9|@]|A|$]]|$1|N|3|-4|5|6|7|1G|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|1H|8|@]|9|@]|A|$]]|$1|P|3|Q|5|6|7|1I|8|@]|9|@]|A|$]]|$1|R|3|-4|5|6|7|1J|8|@]|9|@]|A|$]]|$1|S|3|T|5|6|7|1K|8|@]|9|@$U|1L|V|1M|1|1N]]|A|$]]|$1|W|3|X|5|6|7|1O|8|@]|9|@$U|1P|V|1Q|1|1R]]|A|$]]|$1|Y|3|-4|5|6|7|1S|8|@]|9|@]|A|$]]]|Z|$10|$5|11|12|13|A|$14|15]]|16|$5|11|12|13|A|$14|17]]]]

Initially I was trying to import an android project from github and encountered the above problem 

<ul>
<li>cannot configure build path</li>
<li>unable to get system libraries</li>
</ul>

<hr>

<blockquote>
 Package Explorer -> Right click the project -> “Properties” ->
 "Android" -> "Project Build Target" = 2.3.3
</blockquote>

Note: Also try Clean (On Windows: Project -> Clean) then Refresh (F5) at random. There's a good chance this will magically solve all your problems.

<hr>

courtesy: <a href="http://kyleclegg.com/" rel="nofollow">KYLE CLEGG</a> 
 <a href="http://kyleclegg.com/android-requires-compiler-compliance-level-5-0/" rel="nofollow">reference link</a>

blocks|key|239401|text|转到eclipse→→构建路径。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|239402|您是否看到那里配置了JRE_LIB？如果不是，请从JDK/jre+lib位置添加JRE_LIB。可以在每个项目中覆盖这些属性。您的eclipse似乎并不了解Java库。|offset|length|style|CODE|239403|entityMap^0|0|A|7|P|7|X|3|14|7|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@$D|L|E|M|F|G]|$D|N|E|O|F|G]|$D|P|E|Q|F|G]|$D|R|E|S|F|G]]|9|@]|A|$]]|$1|H|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|I|$]]

Goto eclipse → Preferences → Java → Build path.

Do you see a <code>JRE_LIB</code> configured there? If not, add <code>JRE_LIB</code> from <code>JDK/jre</code> <code>lib</code> location. These can be overridden per project. It seems your eclipse isn't aware of Java libraries.

blocks|key|241113|text|这些对我来说都不管用。我为项目创建了一个新的工作区。这对我很有效！切换到新的工作空间通常会奇迹般地解决许多这样的配置问题。只需在您希望的新工作区中创建一个新文件夹，然后使用“从现有代码导入项目”即可。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|241114|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

None of this worked for me. I created a new workspace for the projects. That worked for me! Switching to a new workspace usually miraculously solves a lot of these configuration problems. Simply create a new folder where you would want your new workspace to be and then use 'import project from existing code'.

blocks|key|239506|text|我曾经在eclipse中导入项目时看到过这样的错误。解决方案是进入属性->Android并选择合适的项目构建目标(Android+x.x.x或Google+API)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|239507|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I have seen such errors in past while importing projects in eclipse. The solution to that is to go to properties->Android and select project build target appropriately (Android x.x.x or Google APIs)

blocks|key|3119954|text|我遇到了类似的问题……请确保|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3119955|3119956|您可以在工作区中创建项目。如果您的项目不是默认工作区中的，其中将存在其他插件文件夹等.metadata文件夹，则会要求您配置生成路径，因为由于生成路径不完整，所以不会生成项目。|ordered-list-item|offset|length|style|BOLD|3119957|3119958|如果第一步是明确的，那么就去做这件事……|3119959|3119960|右键单击项目->生成路径->配置生成路径->库->添加库->+JRE系统库->+Apply+->close。|3119961|3119962|entityMap^0|0|0|H|B|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|T|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|U|8|@$F|V|G|W|H|I]]|9|@]|A|$]]|$1|J|3|-4|5|6|7|X|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|Y|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]|$1|N|3|O|5|E|7|10|8|@]|9|@]|A|$]]|$1|P|3|-4|5|6|7|11|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|R|$]]

I encountered with the similar problem.....
Make sure that
<ol>
<li>You create your project within your workspace. If your project is not in the default workspace where .metadata folder within which other plugin folders, and etc. will be present, then it will ask you to configure build path as the project is not build because of incomplete build path.</li>
</ol>
If the first step is clear, then go for this.....
<ol start="2">
<li>Right click on your project -&gt; build path -&gt; configure build path -&gt; libraries -&gt; Add libraries -&gt; JRE system libraries -&gt; Apply and close.</li>
</ol>

blocks|key|2905343|text|我必须删除gen文件夹中的R.java，然后进行一次干净的构建。这解决了我的问题。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2905344|entityMap^0|5|3|D|6|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

I had to delete <code>R.java</code> in the <code>gen</code> folder, then do a clean build. This solved my issue.

blocks|key|3119622|text|Steve的回答确实对一些项目有帮助，但对于一些项目来说，它仍然是一样的。我猜项目以前是在早期的JDK+1.5中构建的(在我的例子中)。但我为他们找到了一个变通方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3119623|3119624|找到导致问题的类(在import块之后继续展开项目包中的类内容。|ordered-list-item|offset|length|style|CODE|3119625|删除整个类。|3119626|右键单击项目，然后使用Android+Tools+>>+Fix+project+Properties|BOLD|3119627|Create在删除的类之前的同一包下具有相同名称的类。(如果项目是导入的，并且删除的类是Activity/Service/Provider/Reciever，，我猜该类已经包含在AndroidManifest.xml).|3119628|Paste中，然后导入packages.|3119629|Clean项目。|3119630|3119631|entityMap^0|0|0|A|6|0|0|B|13|0|18|Y|2H|J|0|0|0|0^^$0|@$1|2|3|4|5|6|7|X|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|Z|8|@$F|10|G|11|H|I]]|9|@]|A|$]]|$1|J|3|K|5|E|7|12|8|@]|9|@]|A|$]]|$1|L|3|M|5|E|7|13|8|@$F|14|G|15|H|N]]|9|@]|A|$]]|$1|O|3|P|5|E|7|16|8|@$F|17|G|18|H|N]|$F|19|G|1A|H|I]]|9|@]|A|$]]|$1|Q|3|R|5|E|7|1B|8|@]|9|@]|A|$]]|$1|S|3|T|5|E|7|1C|8|@]|9|@]|A|$]]|$1|U|3|-4|5|6|7|1D|8|@]|9|@]|A|$]]|$1|V|3|-4|5|6|7|1E|8|@]|9|@]|A|$]]]|W|$]]

Steve's answer does help for some projects, but still, for some projects, it remains the same. I guess that projects were previously build-in early JDK 1.5 (in my case). But I found a workaround for them:

<ol>
<li>Find the class that causes the problem (Keep expanding the project in the Package Explorer).</li>
<li>Copy the class's contents after the <code>import</code> block.</li>
<li>Delete the whole class.</li>
<li>Right Click on the project then Android Tools >> Fix Project Properties</li>
<li>Create a class with the same name under the same package the deleted class was before. (If the project is imported and the deleted class was an Activity/Service/Provider/Reciever, I guess the class is already included in the <code>AndroidManifest.xml</code>).</li>
<li>Paste the content of the class and import packages.</li>
<li>Clean the project.</li>
</ol>

blocks|key|239481|text|我也遇到过类似的问题。完全相同的错误，但在Ubuntu中，当我在Windows的dropbox文件夹中处理项目后。我刚刚将android.jar添加到项目中。不知何故，它从构建路径中消失了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|239482|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I've had similar problem. Exact same error, but in Ubuntu after I worked on project in dropbox folder from Windows.
I've just added android.jar to project. Somehow it disappeared from build path.

blocks|key|2905481|text|对我来说，这个问题与Ubuntu上的OpenJDK+6有关。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2905482|更新您的JRE或安装Sun的专有JRE，然后重新启动Eclipse。|2905483|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

For me this problem was related to OpenJDK 6 on Ubuntu.

Update your JRE or install Sun's proprietary JRE instead and restart Eclipse.

blocks|key|241205|text|我知道这太迟了。但我也面临着这个问题，我通过以下步骤来解决这个问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|241206|241207|这个问题只有当项目在不同的机器之间共享时才会发生。|ordered-list-item|241208|我发现java+JDK才是问题所在。我的同事|241209|用的是mac系统，用的是jdk1.7。但在我的系统中，我使用的是JDK1.6.|241210|，我猜这可能是问题所在。所以我选择项目并打开属性，并将我的jdk更改为1.7+|241211|Change+target=Google+Inc.:Google+APIs:19|241212|Clean+&+Build|241213|241214|问题终于解决了。我认为这是因为如果你用更高的JDK版本构建你的项目，之后你应该用相同的版本构建。|241215|注意:在我的同事使用JDK+1.7构建之前，我们不会遇到这个问题。在他开始使用JDK+1.7之后，只出现了这个问题。|241216|希望它能为某些人工作。而且不需要安装新的eclipse。|241217|entityMap^0|0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|10|8|@]|9|@]|A|$]]|$1|F|3|G|5|E|7|11|8|@]|9|@]|A|$]]|$1|H|3|I|5|E|7|12|8|@]|9|@]|A|$]]|$1|J|3|K|5|E|7|13|8|@]|9|@]|A|$]]|$1|L|3|M|5|E|7|14|8|@]|9|@]|A|$]]|$1|N|3|O|5|E|7|15|8|@]|9|@]|A|$]]|$1|P|3|-4|5|6|7|16|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|17|8|@]|9|@]|A|$]]|$1|S|3|T|5|6|7|18|8|@]|9|@]|A|$]]|$1|U|3|V|5|6|7|19|8|@]|9|@]|A|$]]|$1|W|3|-4|5|6|7|1A|8|@]|9|@]|A|$]]]|X|$]]

I know this is too late. but I am also facing this issue and I fix this by following below steps.

<ol>
<li>This issue is occurred only if the project shared between different machines.</li>
<li>For me I found java JDK is the problem. </li>
<li>My colleague used mac system and using jdk 1.7. but in my system I used jdk 1.6.</li>
<li>I guess that may be the issue. So I select project and open properties and change my jdk to 1.7 </li>
<li>Change target=Google Inc.:Google APIs:19</li>
<li>Clean &amp; Build</li>
</ol>

Finally issue is fixed. I think this is because of If you build your project with higher JDK version thereafter you should build with same version. 

NOTE : we are not facing this issue before until my colleague build with JDK 1.7. After he started to using JDK 1.7 only this issue occur. 

Hope it will work for some one. And no need for install new eclipse.

blocks|key|241222|text|我在“项目”中关闭了“自动构建”。我关闭了它，因为由于各种未知的原因，Eclipse没有正确地加载项目。打开它，解决了我的问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|241223|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I had my "Build Automatically" turned off in "Project". I turned it off, because the Eclipse was not loading the projects correctly, for various unknown reasons. Turning this on, solved my problem.

blocks|key|2905544|text|如果项目不是很大，您可以复制包并将其粘贴到新项目中，您不会在新项目中看到错误。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2905545|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

if the project is not very big, you can copy the packages and paste it into a new project, you won't see the errors in the new project.

blocks|key|235846|text|我的project.properties里有target-18。但我没有android-18+sdk。所以我把18改成了我的SDK管理器中的其他版本，它解决了这个问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|235847|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

I was having target-18 in my project.properties. But I wasn't having android-18 sdk. So I changed 18 to some other version which I had in my SDK manager, and it fixed the issue.

blocks|key|239585|text|您只需退出eclipse一两次即可重新加载。这对我很管用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|239586|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

You just exit eclipse once or twice to reload. It works for me.

Every time I try to import a project downloaded from googlecode into Eclipse but I get some errors:

<blockquote>
 The project was not built since its build path is incomplete. Cannot
 find the class file for java.lang.Object. Fix the build path then try
 building this project 
 
 Unable to resolve target 'android-10' (this changes from 1 to 15)
</blockquote>

I've already checked the other answers on the site but no solution worked. 

In 

<blockquote>
 Properties -> Java Build Path -> Libraries
</blockquote>

there's 1 item:

<blockquote>
 Unable to get system libraries for the project
</blockquote>

The project was not built since its build path is incomplete

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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功能1上新10个字符

功能2描述100个字符功能2描述100个字符功能2描述100个字符功能2描述100个字符功能2描述100个字符功能2描述100个字符功能2描述100个字符功能2描述100个字符功能2描述100个字符。

功能2上新100个字符功能2上新100个字符功能2上新100个字符功能2上新100个字符功能2上新100个字符功能2上新100个字符功能2上新100个字符功能2上新100个字符功能2上新100个字符。

功能5描述100个字符功能5描述100个字符功能5描述100个字符功能5描述100个字符功能5描述100个字符功能5描述100个字符

功能5上新100个字符功能5上新100个字符功能5上新100个字符功能5上新100个字符功能5上新100个字符功能5上新100个字符功能5上新100个字符功能5上新100个字符功能5上新100个字符功能5上新100个字符

功能4上新

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每次我尝试将从googlecode下载的项目导入到Eclipse中时，都会遇到一些错误：未生成项目，因为其生成路径不完整。找不到java.lang.Object的类文件。修复构建路径，然后尝试构建此项目无法解析目标'android-10‘(从1更改为15)我已经检查了网站上的其他答案，但没有解决方案。在……里面Java属性-> 生成路径->库有一项：无法获取项目的系统库

问未生成该项目，因为其生成路径不完整
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回答 17

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回答 17

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问未生成该项目，因为其生成路径不完整
EN