Merge
Merge branch 'development' of https://github.com/DIdiHL/plugin_android_library into zhaoyue

Merge
Merge pull request #31 from DIdiHL/hanlin

Fix project settings.
Using the library, all code delted
Merge pull request #32 from DIdiHL/zhaoyue

Zhaoyue
Change API level from 20(4.4W) to 19(4.4)
Merge branch 'development' of https://github.com/DIdiHL/plugin_android_library into hanlin