我正在尝试使用新的Android Studio,但我似乎不能让它正常工作。

我正在使用Gson库来序列化/反序列化json对象。但是这个库不知何故没有包含在构建中。

我用MainActivity创建了一个新项目。 复制gson-2.2.3.jar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它。

当我尝试运行项目时,它无法编译,所以我添加:

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

到de .gradle文件中的依赖项。之后,它正确编译,但当运行应用程序时,我得到一个ClassDefNotFoundException。

有人知道我哪里做错了吗?


当前回答

我的答案基本上是收集了上面提供的一些正确但不完整的答案。

Open build.gradle Add the following: dependencies { compile 'com.android.support:appcompat-v7:19.+' compile fileTree(dir: 'libs', include: ['*.jar']) compile 'com.google.code.gson:gson:2.3' } This will allow support for two different ways of adding dependencies. The compile fileTree(dir: 'libs', include: ['*.jar']) (as @Binod mentioned) tells the compiler to look under the folder libs for ANY jar. It is a good practice to create such a folder 'libs' which will contain the jar packages that our application needs to use.

但这也将允许对Maven依赖项的支持。编译'com.google.code.gson:gson:2.3'(正如@saneryee所提到的)是另一种推荐的方法,可以在中央远程存储库中添加依赖项,而不是在我们的/libs“本地存储库”中。它基本上是告诉gradle寻找该包的版本,并告诉编译器在编译项目时考虑它(在类路径中)

PS:我两者都用

其他回答

编译fileTree(dir: 'libs',包括:'*.jar')工作正常,但编译文件(…)已在Studio Beta 0.8.1测试

1. 将jar(在我的例子中是gson-2.2.4.jar)放入libs文件夹。 2. 确保构建中有编译文件(libs/gson-2.2.4.jar)。gradle文件。 3.现在点击“同步项目与Gradle文件”(顶部栏左侧到AVD管理器按钮)。

在我完成以上三项之后,它开始正常工作。

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

menu File -> project struct -> module select "app" -> dependencies tab -> + button 
-> File dependency -> PATH/myfile.jar

1)在Project/app/src文件夹中创建一个your_libs文件夹。

2)复制jar文件到your_libs文件夹

3)在Android Studio中,点击文件->项目结构->依赖项->添加->文件依赖项,然后导航到你的jar文件,它应该在src/your_libs下

3)选择jar文件,点击“确定”

然后你可以看到你的构建。Gradle是这样的:编译 文件(src / your_libs / your.jar)