Merge pull request #24 from heyongjian/master

huangming:merge the main branch to native branch.
Merge pull request #25 from heyongjian/master

huangming:merge the main branch to native branch.
huangming: fix launcher crash caused by repeatedly loaded image.
Merge pull request #32 from whuthm/master

huangming:fix launcher crash caused by repeatedly loaded image.