Merge pull request #229 from lwanghaol/master

fix bug:issue-75,crash when click the contact widget
Merge pull request #98 from heyongjian/master

huangming:merge the main branch to native branch.
fix bug JOYL-63, the background turns white when click the preview button.

the images that server provides is too large.
Merge pull request #231 from whuthm/master

fix bug JOYL-63, the background turns white when click the preview button.
Merge pull request #70 from heyongjian/master

pull