创建一个File对象，该对象表示相对于.jar文件根目录的目录

Question

I'm trying to run Robolectric tests that are kicked off inside of an executable .jar file. Robolectric requires you to pass a File to its constructor with the directory which contains the AndroidManifest.xml file. My AndroidManifest.xml file sits at the root of my .jar file, and the test runner lives in a package something like com.some.package. How can I achieve this?

I tried the following:

public class CustomTestRunner extends RobolectricTestRunner {
    public CustomTestRunner(Class testClass) throws InitializationError, URISyntaxException {
        super(testClass, new File(CustomTestRunner.class.getResource("/AndroidManifest.xml").getPath().replace("AndroidManifest.xml", "")));
    }
}

Which doesn't work, when it runs Robolectric complains, and I get this FileNotFoundException:

java.io.FileNotFoundException: /Users/christopherperry/Desktop/file:/Users/christopherperry/Desktop/my-executable-jar.jar!/AndroidManifest.xml not found or not a file; it should point to your project's AndroidManifest.xml at com.xtremelabs.robolectric.RobolectricConfig.validate(RobolectricConfig.java:73) at com.xtremelabs.robolectric.RobolectricTestRunner.createResourceLoader(RobolectricTestRunner.java:602)

I don't understand because the AndroidManifest.xml file IS in the root of the jar file, and from the error message this appears to be where it is looking.

Answer 1

Items in JAR files are not themselves files, so the answer is "you can't".

You can access them via URLs obtained from Class.getResource(), or streams obtained from Class.getResourceAsStream().