Android build.xml库项目

Question

I have a mainproject that references an android library project. My mainproject should be builded, optimized and obfuscated using Proguard. Therefore I used the buildscript described here . It's about 260 lines. Too much to post it here.

Now I've added a reference to a library project. My default.properties got changed with android.library.reference.1=../RefProject . Since I've added this my buildscript fails with the error:

java.io.IOException: The output jar is empty. Did you specify the proper '-keep' options? [java] at proguard.shrink.Shrinker.execute(Shrinker.java:148) [java] at proguard.ProGuard.shrink(ProGuard.java:275) [java] at proguard.ProGuard.execute(ProGuard.java:101) [java] at proguard.ProGuard.main(ProGuard.java:492) [java] Note: there were 1 references to unknown classes. [java] You should check your configuration for typos. [java] Ignoring unused library classes... [java] Original number of library classes: 2680 [java] Final number of library classes: 9

Furthermore it would be cool if my library project will be optimized and obfuscated first and than used by the main project.

Is there a way to first build the library project (it has actually no build.xml) first and than use the builded apk (or is it a jar than?) in my mainproject?

Answer 1

Since ADT 14 all library projects should have their own build.xml files, as stated here . All your library project will be build before your main project, in order specified in your project.properties file. More details about library project you can find in official documentation .