Apk扩展文件：当我尝试运行应用程序时出错

Question

我正在开发apk文件扩展，我已经从sdk下载了示例项目

它包含以下文件：

1) downloader_lib proj
2) zip_file proj
3) SampleDownloaderActivity proj

Now when i run the SampleDownloaderActivity it says :

could not find zip.apk not found
could not find downloader_library.apk!