Merge pull request #26 from whuthm/master

huangming:add the desktop appearance , replacing system icons and adaptation for new joy launcher.
Merge pull request #14 from heyongjian/master

merger
wanghao:add iconlistprefrences,add menu for add widget
modify bug when add widget
Merge pull request #27 from lwanghaol/master

wanghao:add iconlistprefrences,add menu for add widget
Merge pull request #23 from heyongjian/master

huangming:merge the main branch to native branch.