将.jar文件放到Android项目的libs文件夹中。

然后在应用程序的gradle文件中添加这行代码:

    compile fileTree(dir: 'libs', include: ['*.jar'])

对于Android gradle插件3.0及以后版本，最好使用这个:

    implementation fileTree(dir: 'libs', include: ['*.jar'])

下面是将本地jar文件作为库添加到模块的说明:

Create a 'libs' folder in the top level of the module directory (the same directory that contains the 'src' directory) In the build.gradle file add the following so that your dependencies closure has: dependencies { // ... other dependencies compile files('libs/<your jar's name here>') } Android Studio should have already setup a gradlew wrapper. From the command line, navigate to the top level of your project (the directory that has a gradlew file). Run ./gradlew assemble. This should compile the project with the library. You may need to fix errors in your build.gradle file as necessary. In order to have Android Studio recognize the local jar files as libraries for support while coding in the IDE, you need to take a few more steps: 4.1. Right click on the module in the left hand panel and choose Open Library Settings. 4.2. On the left panel of the dialog, choose Libraries. 4.3. Click the + sign above the panel second from the left -> Java 4.4. Select your local jar and add it to the project. You may need to run the above ./gradlew command one more time

第一步:现在在你的app文件夹下，你应该看到libs，如果你没有看到它，然后创建它。

第二步:在这里拖放。jar文件，你可能会得到一个提示“这个文件不属于项目”，只需点击确定按钮。

步骤3:现在你应该在libs文件夹下看到jar文件，右键单击jar文件并选择“添加为库”，点击确定提示“创建库”

步骤4:现在已经添加了这个罐子。

在Mac OS X上:

将jar添加为库(将jar拖到libs，右键单击添加为库) 在build.grade中添加compile语句 安装gradle v1.6(使用自制软件) Brew install gradle gradle - v 如果不是v1.6，升级homebrew Gradle清洁(重建android不工作)

这让我理清了思路。

我已经阅读了这里所有的答案，它们似乎都涵盖了旧版本的Android Studio!

用Android Studio 2.2.3创建一个项目，我只需要在app下创建一个libs目录，并将我的jar放在那里。 我是用我的文件管理器完成的，不需要在Android Studio中点击或编辑任何东西。

为什么有效?打开构建/编辑库和依赖项，你会看到:

{include=[*.jar], dir=libs}

在Kotlin DSL (build.gradle.kts)中，有多种方法可以做到这一点。 我们假设库文件在project/app/libs/目录下。

Method 1 implementation( files( "libs/library-1.jar", "libs/library-2.jar", "$rootDir/foo/my-common-library.jar" ) ) Method 2 implementation( fileTree("libs/") { // You can add as many include or exclude calls as you want include("*.jar") include("another-library.aar") // aar is similar to jar exclude("bad-library.jar") } ) Method 3 implementation( fileTree( // Here, instead of repeating include or exclude, assign a list "dir" to "libs/", "include" to "*.jar", "exclude" to listOf("bad-library-1.jar", "bad-library-2.jar") ) ) Method 4 repositories { flatDir { dirs("libs/", "lib/") } } dependencies { // Could also write implementation(":jsoup:1.4.13") implementation("org.jsoup:jsoup:1.4.13") // NOTE: Add @aar suffix for AAR files implementation("ir.mahozad.android:pie-chart:0.7.0@aar") }

您可以在包含和排除调用中使用Ant模式，如上所示。

有关这方面的更多信息，请参阅Gradle文档。

感谢这篇文章和这篇文章提供了有用的答案。