Java 如何在 Android Studio 项目中添加类路径
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How to add classpath in an Android Studio project
提问by Stefano Piovesan
I have an Android project with an Android application that depends on a pure Java library (and the Java library uses some others compiled jars libraries).
I added the dependencies, I can build the project, but at run time I have a ClassNotFoundExceptionerror.
I had to add to theCLASSPATHenvironment variable the path to the jars.
Is there a way to set the classpath locally for the project only, like using the command line option
我有一个带有 Android 应用程序的 Android 项目，该应用程序依赖于纯 Java 库（Java 库使用其他一些编译的 jars 库）。
我添加了依赖项，我可以构建项目，但是在运行时出现ClassNotFoundException错误。
我必须将CLASSPATHjars 的路径添加到环境变量中。
有没有办法只在本地为项目设置类路径，比如使用命令行选项
java –classpath <path to the jars>
in the Android studio Run/Debug Configurations?
在 Android Studio 运行/调试配置中？
回答by Arnold Layne
First off all, be sure there's a "libs" subfolder in the "app" folder of your project. If there's not, create one. Next, in the app/build.gradle file, add this line of code:
首先，确保项目的“app”文件夹中有一个“libs”子文件夹。如果没有，请创建一个。接下来，在 app/build.gradle 文件中，添加这行代码：
dependencies {
...
compile fileTree(dir:'libs', include: ['*.jar'])
...
}
Place all of your .jar files in the "libs" folder, and voila, you're done
将所有 .jar 文件放在“libs”文件夹中，瞧，大功告成
回答by User
Thanks to Arnold Layne, I created a folder named libs.
感谢Arnold Layne，我创建了一个名为 libs 的文件夹。
Then, I went to
然后，我去了
Files -> Project Structure (new menu opens) -> Modules (on the left) -> app -> Dependencies
文件 -> 项目结构（打开新菜单）-> 模块（在左侧）-> 应用程序 -> 依赖项
There, I could add the library with the +Button.
在那里，我可以使用+Button添加库。
This created this entry:
这创建了这个条目：
dependencies {
implementation files('libs/commons-lang3-3.7.jar')
}
回答by Jo?o Scheleder Neto
Add this lines to build.gradleof appmodule.
将此行添加到build.gradleofapp模块。
dependencies {
...
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation files('libs/mysql-connector-java-8.0.16')
...
}
