Merge pull request #58 from heyongjian/master

pull request
fix bug,issue-47,unified format for the download apk name
fix bug,issue-48,after the download is complete, the progress bar does not disappear
wanghao:optimized code,is printed log for download
Merge pull request #60 from heyongjian/master

pull request
Merge pull request #190 from lwanghaol/master

fix bug,issue-48,after the download is complete, the progress bar does not disappear