blocks|key|3222394|text|上面写着“Android库项目无法启动”，因为Android库项目无法启动。就这么简单。您不能运行库。如果您想测试库，请创建一个使用该库的Android项目，并执行它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3222395|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|$]]

It says “Android library projects cannot be launched” because Android library projects cannot be launched. That simple. You cannot run a library. If you want to test a library, create an Android project that uses the library, and execute it.

blocks|key|3008252|text|来自Android开发人员关于使用ADT从Eclipse管理项目的文档：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3008253|Setting+up+a+Library+Project|offset|length|3008254|3008255|接下来，设置项目的属性以指示它是库项目：|blockquote|3008256|3008257|3008258|在Android包资源管理器中，右键单击库项目并选择Android属性窗口，选择左侧的"Android“属性组，并在"is+”复选框中找到Properties.|style|BOLD|3008259|In库属性，然后单击Apply.|unordered-list-item|3008260|
|3008261|Click+OK<|3008262|>e222>以关闭“属性”窗口。|ordered-list-item|3008263|3008264|3008265|所以，打开你的项目属性，取消选中"Is+Library“复选框，然后点击Apply，让你的项目成为一个普通的Android项目(而不是库项目)。|3008266|entityMap|0|LINK|mutability|MUTABLE|url|http://developer.android.com/tools/projects/projects-eclipse.html#SettingUpLibraryProject^0|0|0|S|0|0|0|0|0|0|1Q|I|0|0|3|A|5|0|0|0|0|0|0|10|5|0^^$0|@$1|2|3|4|5|6|7|1B|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1C|8|@]|9|@$D|1D|E|1E|1|1F]]|A|$]]|$1|F|3|-4|5|6|7|1G|8|@]|9|@]|A|$]]|$1|G|3|H|5|I|7|1H|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|1I|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|1J|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|1K|8|@$D|1L|E|1M|N|O]]|9|@]|A|$]]|$1|P|3|Q|5|R|7|1N|8|@$D|1O|E|1P|N|O]|$D|1Q|E|1R|N|O]]|9|@]|A|$]]|$1|S|3|T|5|6|7|1S|8|@]|9|@]|A|$]]|$1|U|3|V|5|R|7|1T|8|@]|9|@]|A|$]]|$1|W|3|X|5|Y|7|1U|8|@]|9|@]|A|$]]|$1|Z|3|-4|5|6|7|1V|8|@]|9|@]|A|$]]|$1|10|3|-4|5|6|7|1W|8|@]|9|@]|A|$]]|$1|11|3|12|5|6|7|1X|8|@$D|1Y|E|1Z|N|O]]|9|@]|A|$]]|$1|13|3|-4|5|6|7|20|8|@]|9|@]|A|$]]]|14|$15|$5|16|17|18|A|$19|1A]]]]

From Android's Developer Documentation on Managing Projects from Eclipse with ADT: 

<a href="http://developer.android.com/tools/projects/projects-eclipse.html#SettingUpLibraryProject" rel="noreferrer">Setting up a Library Project</a>

<blockquote>
 Next, set the project's Properties to indicate that it is a library project:
 
 <ol>
 <li>In the Package Explorer, right-click the library project and select Properties.</li>
 <li>In the Properties window, select the "Android" properties group at left and locate the Library properties at right.</li>
 <li>Select the "is Library" checkbox and click Apply.</li>
 <li>Click OK to close the Properties window.</li>
 </ol>
</blockquote>

So, open your project properties, un-select the "Is Library" checkbox, and click Apply to make your project a normal Android project (not a library project).

blocks|key|3222414|text|在Eclipse+Project+->中，像这样干净地修改project.properties：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3222415|target=android-10
android.library.reference.1=F:/svn/WiEngine_library|code-block|syntax|javascript|3222416|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

In Eclipse Project -> Clean 
Modify project.properties like this :

<pre><code>target=android-10
android.library.reference.1=F:/svn/WiEngine_library
</code></pre>

blocks|key|289751|text|对于我来说，我在Eclipse>Project+Properties>Android下面勾选了这个库，我刚才做的是取消勾选这个被勾选的库。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|289752|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|$]]

With Me I had the library ticked under Eclipse>Project Properties>Android what I just did was uncheck the ticked library.

blocks|key|3222449|text|通过此步骤，您可以。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3222450|3222451|在Eclipse中，右键单击+on++from+Package+Explorer.|ordered-list-item|offset|length|style|BOLD|3222452|Select+属性，.|3222453|从属性E219弹出窗口中选择E217，|3222454|请参阅“E122是库”复选框，|3222455|如果是选中然后取消选中“是库”复选框。|3222456|如果是E227然后取消选中+"Is+Library“复选框。|3222457|如果它是E227然后取消选中”is库“复选框。|3222458|E227然后”Is“复选框。|3222459|单击E233+132|3222460|3222461|entityMap^0|0|0|1|7|O|G|0|7|2|0|1|I|0|0|F|0|0|J|0|0|U|0|0|N|0|0|E|0|0|A|0|0^^$0|@$1|2|3|4|5|6|7|12|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|13|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|14|8|@$F|15|G|16|H|I]|$F|17|G|18|H|I]]|9|@]|A|$]]|$1|J|3|K|5|E|7|19|8|@$F|1A|G|1B|H|I]]|9|@]|A|$]]|$1|L|3|M|5|E|7|1C|8|@$F|1D|G|1E|H|I]]|9|@]|A|$]]|$1|N|3|O|5|E|7|1F|8|@$F|1G|G|1H|H|I]]|9|@]|A|$]]|$1|P|3|Q|5|E|7|1I|8|@$F|1J|G|1K|H|I]]|9|@]|A|$]]|$1|R|3|S|5|E|7|1L|8|@$F|1M|G|1N|H|I]]|9|@]|A|$]]|$1|T|3|U|5|E|7|1O|8|@$F|1P|G|1Q|H|I]]|9|@]|A|$]]|$1|V|3|W|5|E|7|1R|8|@$F|1S|G|1T|H|I]]|9|@]|A|$]]|$1|X|3|Y|5|E|7|1U|8|@$F|1V|G|1W|H|I]]|9|@]|A|$]]|$1|Z|3|-4|5|6|7|1X|8|@]|9|@]|A|$]]|$1|10|3|-4|5|6|7|1Y|8|@]|9|@]|A|$]]]|11|$]]

Through the this steps you can .

<ol>
<li>In Eclipse , Right Click on Project from Package Explorer.</li>
<li>Select Properties,.</li>
<li>Select Android from Properties pop up window,</li>
<li>See "Is Library" check box,</li>
<li>If it is checked then Unchecked "Is Library" check box.</li>
<li>Click Apply and than OK.</li>
</ol>

blocks|key|3008392|text|我们的项目肯定被配置为“库”，这就是为什么你会得到这样的信息："Android库项目不能启动。“|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3008393|在项目中单击鼠标右键，然后选择属性。在"Android“->的”Properties“窗口中，取消选中"is+Library”选项并应用->单击"ok“关闭属性窗口。|3008394|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|$]]

our project surely is configured as "library" thats why you get the message : "Android library projects cannot be launched."

right-click in your project and select Properties. In the Properties window -> "Android" -> uncheck the option "is Library" and apply -> Click "ok" to close the properties window.

blocks|key|3222575|text|通过以下步骤，您可以做到这一点。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3222576|在Eclipse窗口中，右键单击Package+Explorer中的项目。1.选择Properties，2.在Properties中选择Android，3.选中"Is+Library“复选框，4.如果选中，则取消选中"Is+Library”复选框。5.单击应用，然后单击确定。|3222577|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|$]]

Through the following steps you can do it .

In Eclipse window , Right Click on your Project from Package Explorer.
1. Select Properties,
2. Select Android from Properties,
3. Check "Is Library" check box,
4. If it is checked then Unchecked "Is Library" check box.
5. Click Apply and than OK.

blocks|key|3222623|text|在项目中单击鼠标右键，然后选择属性。在"Android“->的”Properties“窗口中，取消选中"is+Library”选项并应用->单击"ok“关闭属性窗口。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3222624|这是解决这个问题的最佳答案。|3222625|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|$]]

right-click in your project and select Properties. In the Properties window -> "Android" -> uncheck the option "is Library" and apply -> Click "ok" to close the properties window.

This is the best answer to solve the problem

Now I am totally confused by this error message: Android library projects cannot be launched. 

I carefully checked the build path and library, everything seems "OK", and there is no error on Problems view, however, when I tried to run my application as an Android project, it failed and showed that message.

Any explanation for why it's happening is appreciated!

"Android library projects cannot be launched"?

Android

Eclipse

现在我完全被这个错误信息搞糊涂了：安卓库项目无法启动。我仔细检查了构建路径和库，一切似乎都“正常”，Problems视图上也没有错误，但是，当我尝试将我的应用程序作为Android项目运行时，它失败了，并显示了该消息。对为什么会发生这种情况的任何解释都是值得感谢的！

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