在cocos creator上编译安卓App的时候，在21 level下没问题，但19 level下回报如下错误：

1. xxx/proj.android/../cocos2d/cocos/./platform/CCFileUtils.cpp:277:error:undefinedreferenceto'atof'
2. xxx/proj.android/../cocos2d/cocos/./platform/CCFileUtils.cpp:286:error:undefinedreferenceto'atof'
3. xxx/proj.android/../cocos2d/cocos/./base/CCConsole.cpp:1224:error:undefinedreferenceto'srand'
4. xxx/proj.android/../cocos2d/cocos/./base/CCConsole.cpp:1225:error:undefinedreferenceto'rand'
5. xxx/proj.android/../cocos2d/cocos/./base/CCConsole.cpp:1253:error:undefinedreferenceto'srand'
6. xxx/proj.android/../cocos2d/cocos/./base/CCConsole.cpp:1254:error:undefinedreferenceto'rand'
7. xxx/proj.android/../cocos2d/cocos/./base/ccUtils.cpp:254:error:undefinedreferenceto'atof'
8. xxx/proj.android/../cocos2d/cocos/./base/ccRandom.h:117:error:undefinedreferenceto'rand'
9. xxx/Pickle/proj.android/../cocos2d/cocos/./base/ccRandom.h:117:error:undefinedreferenceto'rand'
10. xxx/proj.android/../cocos2d/cocos/./2d/CCActionTiledGrid.cpp:280:error:undefinedreferenceto'srand'
11. xxx/proj.android/../cocos2d/cocos/./2d/CCActionTiledGrid.cpp:605:error:undefinedreferenceto'srand'

解决办法：

修改proj.android/jni/Application.mk文件，增加如下一行代码：

APP_PLATFORM := android-19

再重新编译就ok了，这样不管是编译x86的，还是arm得，还是armv7的就都不报错了。