用apache的ant.jar在安卓上解zip压缩，pc运行没问题，但安卓上就报错，请帮忙！

[Nazism]

PC运行正常，安卓运行就报错，请各位帮忙。
源码：
public static void unzip2(String sourceZip,String destDir) throws Exception{
try{
Project p = new Project();
Expand e = new Expand();
e.setProject(p);
e.setSrc(new File(sourceZip));
e.setOverwrite(false);
e.setDest(new File(destDir));
e.setEncoding("UTF-8"); //根据linux系统的实际编码设置
e.execute();
}catch(Exception e){
throw e;
}
}

报错如下：

GC freed 640 objects / 50336 bytes in 38ms
Could not find class 'org.apache.tools.ant.Project', referenced from method cn.cmmb.zip2.Decompression.unzip2
VFY: unable to resolve new-instance 93 (Lorg/apache/tools/ant/Project;) in Lcn/cmmb/zip2/Decompression;
VFY: replacing opcode 0x22 at 0x0000
Making a copy of Lcn/cmmb/zip2/Decompression;.unzip2 code (116 bytes)
VFY: unable to find class referenced in signature (Lorg/apache/tools/zip/ZipOutputStream;)
Could not find class 'org.apache.tools.zip.ZipEntry', referenced from method cn.cmmb.zip2.Decompression.zip
VFY: unable to resolve new-instance 95 (Lorg/apache/tools/zip/ZipEntry;) in Lcn/cmmb/zip2/Decompression;
VFY: replacing opcode 0x22 at 0x000b
Making a copy of Lcn/cmmb/zip2/Decompression;.zip code (425 bytes)
Could not find class 'org.apache.tools.zip.ZipEntry', referenced from method cn.cmmb.zip2.Decompression.zip
VFY: unable to resolve new-instance 95 (Lorg/apache/tools/zip/ZipEntry;) in Lcn/cmmb/zip2/Decompression;
VFY: replacing opcode 0x22 at 0x006d
Could not find class 'org.apache.tools.zip.ZipEntry', referenced from method cn.cmmb.zip2.Decompression.zip
VFY: unable to resolve new-instance 95 (Lorg/apache/tools/zip/ZipEntry;) in Lcn/cmmb/zip2/Decompression;
VFY: replacing opcode 0x22 at 0x008c
Could not find class 'org.apache.tools.zip.ZipFile', referenced from method cn.cmmb.zip2.Decompression.unzip
VFY: unable to resolve new-instance 96 (Lorg/apache/tools/zip/ZipFile;) in Lcn/cmmb/zip2/Decompression;
VFY: replacing opcode 0x22 at 0x0014
Making a copy of Lcn/cmmb/zip2/Decompression;.unzip code (635 bytes)
Could not find class 'org.apache.tools.zip.ZipFile', referenced from method cn.cmmb.zip2.Decompression.unzip
VFY: unable to resolve new-instance 96 (Lorg/apache/tools/zip/ZipFile;) in Lcn/cmmb/zip2/Decompression;
VFY: replacing opcode 0x22 at 0x0014
Making a copy of Lcn/cmmb/zip2/Decompression;.unzip code (635 bytes)
Could not find class 'org.apache.tools.zip.ZipOutputStream', referenced from method cn.cmmb.zip2.Decompression.zip
VFY: unable to resolve new-instance 97 (Lorg/apache/tools/zip/ZipOutputStream;) in Lcn/cmmb/zip2/Decompression;
VFY: replacing opcode 0x22 at 0x0001
Making a copy of Lcn/cmmb/zip2/Decompression;.zip code (137 bytes)
Shutting down VM

[Nazism]

ant版本：ant-1.7.1.jar

[AMinfo]

没找到Could not find class 'org.apache.tools.ant.Project'这个类，jar调用不成功。
在项目中建立lib目录，将jar文件拷入。

[Nazism]

建立了，也将jar引入项目了，可还是找不到