最后，我找到了解决方案：

android.libraryVariants.all {

变体 - >
def name = variant.buildType.name

{pre> if（name.equals（com.android.builder.core.BuilderConstants.DEBUG））{
return; //跳过调试版本。
}
def task = project.tasks.createjar $ {name.capitalize（）}，Jar
task.dependsOn variant.javaCompile
//包含Java类
task.from variant.javaCompile.destinationDir
//包含依赖的jar包含一些异常
task.from configurations.compile.findAll {
it.getName（）！='android。 jar'&& ！it.getName（）。startsWith（'junit'）&& ！it.getName（）。startsWith（'hamcrest'）
} .collect {
it.isDirectory（）？它：zipTree（it）
}
artifacts.add（'archives'，task）;


}

I want to use android studio to make a library project to a jar file which contains many jar files and library projects like this:

dependencies {

compile fileTree(dir: 'libs', include: ['*.jar'])
compile project(':app:libraries:MyLibrary:app')
compile 'com.luckycatlabs:SunriseSunsetCalculator:1.2' 
compile project(':app:libraries:MyLibrary:app:libraries:MySubLibrary:app')

}

How can I make a jar file with all this dependencies and own class files?

Finally, I found the solution:

android.libraryVariants.all {

variant -> def name = variant.buildType.name

if (name.equals(com.android.builder.core.BuilderConstants.DEBUG)) {
    return; // Skip debug builds.
}
def task = project.tasks.create "jar${name.capitalize()}", Jar
task.dependsOn variant.javaCompile
//Include Java classes
task.from variant.javaCompile.destinationDir
//Include dependent jars with some exceptions
task.from configurations.compile.findAll {
    it.getName() != 'android.jar' && !it.getName().startsWith('junit') && !it.getName().startsWith('hamcrest')
}.collect {
    it.isDirectory() ? it : zipTree(it)
}
artifacts.add('archives', task);

}