Android Studio:将 jar 添加为库? [英] Android Studio: Add jar as library?

问题描述

我正在尝试使用新的 Android Studio，但似乎无法正常工作.

I'm trying to use the new Android Studio but I can't seem to get it working correctly.

我正在使用 Gson 库来序列化/反序列化 JSON 对象.但是该库不知何故未包含在构建中.

I'm using the Gson library to serialize/deserialize JSON-objects. But the library somehow isn't included in the build.

我创建了一个只有 MainActivity 的新项目.将 gson-2.2.3.jar 复制到/libs 文件夹中并将其添加为库依赖项(右键单击 -> 添加为库).这包括 android studio 中的 jar，因此可以从源文件中引用.

I had created a new project with just a MainActivity. Copied gson-2.2.3.jar in the /libs folder and added it as a library dependancy(right click->Add as library). This includes the jar in android studio so it can be referenced from the source files.

当我尝试运行该项目时，它无法编译，所以我添加了:

When I try to run the project it cannot compile so I added:

compile files('libs/gson-2.2.3.jar')

到 de .gradle 文件中的依赖项.之后它可以正确编译，但在运行应用程序时，我得到一个 ClassDefNotFoundException.

to the dependencies in de .gradle file. After that it compiles correctly but when running the application I get a ClassDefNotFoundException.

有人知道我做错了什么吗?

Does anyone know what I'm doing wrong?

推荐答案

我已经为同一件事苦苦挣扎了好几个小时，试图让 Gson jar 继续工作.我终于破解了——这是我采取的步骤:

I've been struggling with the same thing for many hours, trying to get the Gson jar to work no less. I finally cracked it – here are the steps I took:

1. 将 Gson jar(在我的例子中是 gson-2.2.4.jar)放入 libs 文件夹
2. 右键单击它并点击添加为库"

3. 确保 compile files('libs/gson-2.2.4.jar') 在您的 build.gradle 文件(或 compilefileTree(dir: 'libs', include: '*.jar') 如果你使用了很多 jar 文件)

1. Put the Gson jar (in my case, gson-2.2.4.jar) into the libs folder
2. Right click it and hit 'Add as library'

3. Ensure that compile files('libs/gson-2.2.4.jar') is in your build.gradle file (or compile fileTree(dir: 'libs', include: '*.jar') if you are using many jar files)

Edit : Use implementation files('libs/gson-2.2.4.jar') (或 implementation fileTree(dir: 'libs', include: '*.jar')) 在 Android Studio 3.0+ 中

Edit : Use implementation files('libs/gson-2.2.4.jar') (or implementation fileTree(dir: 'libs', include: '*.jar')) in Android Studio 3.0+

做一个干净的构建(你可能可以在 Android Studio 中做到这一点，但为了确保我在终端中导航到我的应用程序的根文件夹并输入 gradlew clean.我'm 在 Mac OS X 上，命令可能与您的系统不同

Do a clean build (you can probably do this fine in Android Studio, but to make sure I navigated in a terminal to the root folder of my app and typed gradlew clean. I'm on Mac OS X, the command might be different on your system

在我完成上述四个之后，它开始工作正常.我认为添加为库"步骤是我以前错过的步骤，直到我清理它才起作用.

After I did the above four, it started working fine. I think the 'Add as library' step was the one I'd previously missed, and it didn't work until I cleaned it either.

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