android - 从 Eclipse 创建 android 发布版本时出错

Question

我正在尝试使用 生成 apk Android tools > Export Signed apllication project，但出现此错误：

Proguard return with error code 1. See console

控制台说：

[2013-08-21 17:03:56 - DisplayMetrics] Warning: there were 23 unresolved references to classes or interfaces.
[2013-08-21 17:03:56 - DisplayMetrics]          You may need to specify additional library jars (using '-libraryjars').
[2013-08-21 17:03:56 - DisplayMetrics] java.io.IOException: Please correct the above warnings first.
[2013-08-21 17:03:56 - DisplayMetrics]  at proguard.Initializer.execute(Initializer.java:321)
[2013-08-21 17:03:56 - DisplayMetrics]  at proguard.ProGuard.initialize(ProGuard.java:211)
[2013-08-21 17:03:56 - DisplayMetrics]  at proguard.ProGuard.execute(ProGuard.java:86)
[2013-08-21 17:03:56 - DisplayMetrics]  at proguard.ProGuard.main(ProGuard.java:492)

这是从我在文件夹中添加 3 个 jar 文件时发生的libs。我怎样才能解决这个问题？