blocks|key|310050|text|不能将Android库导出为jar文件。但是，也可以将其导出为aar文件。Aar文件是Android库的新的二进制格式。在谷歌I/O，New+Build+System+video上有关于他们的信息。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|310051|首先，在Android+Studio中构建库，或者通过命令行从库的根目录发出gradle+build。|310052|这将产生<yourlibroot>/libs/build/yourlib.aar文件。|310053|此aar文件是库的二进制表示，可以将其添加到项目中，而不是作为依赖项目添加到库中。|310054|要将aar文件作为依赖项添加，必须将其发布到maven中心或本地maven存储库，然后在项目的gradle.build文件中引用aar文件。|310055|然而，这一步有点复杂。我在这里找到了一个很好的解释：|310056|http://www.flexlabs.org/2013/06/using-local-aar-android-library-packages-in-gradle-builds|310057|entityMap|0|LINK|mutability|MUTABLE|url|http://tools.android.com/tech-docs/new-build-system|1^0|V|3|11|3|1V|M|0|0|12|C|0|4|10|0|0|1B|C|0|0|0|2H|1|0^^$0|@$1|2|3|4|5|6|7|10|8|@$9|11|A|12|B|C]|$9|13|A|14|B|C]]|D|@$9|15|A|16|1|17]]|E|$]]|$1|F|3|G|5|6|7|18|8|@$9|19|A|1A|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|1B|8|@$9|1C|A|1D|B|C]]|D|@]|E|$]]|$1|J|3|K|5|6|7|1E|8|@]|D|@]|E|$]]|$1|L|3|M|5|6|7|1F|8|@$9|1G|A|1H|B|C]]|D|@]|E|$]]|$1|N|3|O|5|6|7|1I|8|@]|D|@]|E|$]]|$1|P|3|Q|5|6|7|1J|8|@]|D|@$9|1K|A|1L|1|1M]]|E|$]]|$1|R|3|-4|5|6|7|1N|8|@]|D|@]|E|$]]]|S|$T|$5|U|V|W|E|$X|Y]]|Z|$5|U|V|W|E|$X|Q]]]]

It is not possible to export an Android library as a jar file. It is possible, however, to export it as <code>aar</code> file. <code>Aar</code> files being the new binary format for Android libraries. There's info about them in Google I/O, the <a href="http://tools.android.com/tech-docs/new-build-system">New Build System video</a>.

First, build the library in Android Studio or from command line issuing <code>gradle build</code> from your library's root directory. 

This will result in <code>&lt;yourlibroot&gt;/libs/build/yourlib.aar</code> file.

This aar file is a binary representation of your library and can be added to your project instead of the library as a dependency project. 

To add aar file as a dependency you have to publish it to the maven central or to your local maven repository, and then refer the aar file in your project's <code>gradle.build</code> file.

However, this step is a bit convoluted. I've found a good explanation how to do so here: 

<a href="http://www.flexlabs.org/2013/06/using-local-aar-android-library-packages-in-gradle-builds">http://www.flexlabs.org/2013/06/using-local-aar-android-library-packages-in-gradle-builds</a>

blocks|key|93099|text|这是另一个稍有不同的答案，但有一些增强。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|93100|这段代码直接从.aar中取出.jar。就我个人而言，这让我更有信心，通过.jar发货的bit与通过.aar发货的bit是一样的。这也意味着，如果您使用的是ProGuard，那么输出jar将根据需要进行模糊处理。|93101|我还添加了一个超级"makeJar“任务，它为所有构建变体制作jars。|93102|task(makeJar)+<<+{
++++//+Empty.+We'll+add+dependencies+for+this+task+below
}

//+Generate+jar+creation+tasks+for+all+build+variants
android.libraryVariants.all+{+variant+->
++++String+taskName+=+"makeJar${variant.name.capitalize()}"

++++//+Create+a+jar+by+extracting+it+from+the+assembled+.aar
++++//+This+ensures+that+products+distributed+via+.aar+and+.jar+exactly+the+same+bits
++++task+(taskName,+type:+Copy)+{
++++++++String+archiveName+=+"${project.name}-${variant.name}"
++++++++String+outputDir+=+"${buildDir.getPath()}/outputs"

++++++++dependsOn+"assemble${variant.name.capitalize()}"
++++++++from(zipTree("${outputDir}/aar/${archiveName}.aar"))
++++++++into("${outputDir}/jar/")
++++++++include('classes.jar')
++++++++rename+('classes.jar',+"${archiveName}-${variant.mergedFlavor.versionName}.jar")
++++}

++++makeJar.dependsOn+tasks[taskName]
}|code-block|syntax|javascript|93103|对于好奇的读者，我努力确定com.android.library插件用来命名.aar文件的正确变量和参数。我最终在安卓开源项目here中找到了它们。|offset|length|93104|entityMap|0|LINK|mutability|MUTABLE|url|https://android.googlesource.com/platform/tools/base/%2B/master/build-system/gradle/src/main/groovy/com/android/build/gradle/internal/variant/LibraryVariantFactory.groovy#347^0|0|0|0|0|1R|4|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|Y|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|Z|8|@]|9|@]|A|$I|J]]|$1|K|3|L|5|6|7|10|8|@]|9|@$M|11|N|12|1|13]]|A|$]]|$1|O|3|-4|5|6|7|14|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|V]]]]

Here's yet another, slightly different answer with a few enhancements.

This code takes the .jar right out of the .aar. Personally, that gives me a bit more confidence that the bits being shipped via .jar are the same as the ones shipped via .aar. This also means that if you're using ProGuard, the output jar will be obfuscated as desired.

I also added a super "makeJar" task, that makes jars for all build variants.

<pre><code>task(makeJar) &lt;&lt; {
 // Empty. We'll add dependencies for this task below
}

// Generate jar creation tasks for all build variants
android.libraryVariants.all { variant -&gt;
 String taskName = "makeJar${variant.name.capitalize()}"

 // Create a jar by extracting it from the assembled .aar
 // This ensures that products distributed via .aar and .jar exactly the same bits
 task (taskName, type: Copy) {
 String archiveName = "${project.name}-${variant.name}"
 String outputDir = "${buildDir.getPath()}/outputs"

 dependsOn "assemble${variant.name.capitalize()}"
 from(zipTree("${outputDir}/aar/${archiveName}.aar"))
 into("${outputDir}/jar/")
 include('classes.jar')
 rename ('classes.jar', "${archiveName}-${variant.mergedFlavor.versionName}.jar")
 }

 makeJar.dependsOn tasks[taskName]
}
</code></pre>

For the curious reader, I struggled to determine the correct variables and parameters that the com.android.library plugin uses to name .aar files. I finally found them in the Android Open Source Project <a href="https://android.googlesource.com/platform/tools/base/+/master/build-system/gradle/src/main/groovy/com/android/build/gradle/internal/variant/LibraryVariantFactory.groovy#347" rel="noreferrer">here</a>.

I have downloaded some library sources and would like to export it as a Jar file using
Android Studio. Is there a way to export to jar file using Android studio ?

edit: 

The library I want to export as jar is an Android library.
It's called "StandOut" and can be downloaded from GitHub. 
<a href="https://github.com/pingpongboss/StandOut">https://github.com/pingpongboss/StandOut</a>

How to export library to Jar in Android Studio?

Android Studio

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GitHub

我已经下载了一些库源代码，并希望使用Android Studio将其导出为Jar文件。有没有办法使用Android studio导出到jar文件？编辑：我想导出为jar的库是一个Android库。它被称为"StandOut“，可以从GitHub下载。

问如何在Android Studio中导出库到Jar？
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