fix bug:issue-37, the wallpaper thumbnail loading image is out of shape.

replace the wallpaper thumbnail loading image.
Merge pull request #160 from lwanghaol/master

wanghao:fix bug issue-36,when adding a widget fails, you can not long click
Merge pull request #163 from whuthm/master

fix bug:issue-37, the wallpaper thumbnail loading image is out of shape.
Merge pull request #82 from heyongjian/master

huangming:merge the main branch to native branch.
fix bug :issue-39, when download a wallpaper, the wallpaper thumbnai applys the preview image.

modify the url of the wallpaper thumbnai image.
Merge pull request #169 from whuthm/master

fix bug :issue-39, when download a wallpaper, the wallpaper thumbnai applys the preview image.
fix bug issue-41, when do not download online wallpaper ,the native wallpaper is null.

add some wallpapers to the native wallpaper.
fix bug issue-42, upload file url changes.

modify the upload file url.
Merge pull request #174 from whuthm/master

fix bug issue-41, when do not download online wallpaper ,the native wallpaper is null.
add logs for debug issue-8
Merge pull request #57 from heyongjian/master

merge pull request