Merge pull request #86 from heyongjian/master

huangming:merge the main branch to native branch.
fix bug issue-46, when show the online wallpaper , need a long time to load wallpaper.

restory the online wallpaper list json to the sd card.
Merge pull request #186 from whuthm/master

fix bug issue-46, when show the online wallpaper , need a long time to load wallpaper.