little improvement over too many "def" #252
                
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just added a function which acts like a ternary with fallback option. Hence, less cluttered "def" variables
additionally, changed the SDK values from 23 to 26 as per new changes from react-native and Android
Android Target API Level 26 will be required in August 2018.
https://android-developers.googleblog.com/2017/12/improving-app-security-and-performance.html
And the React Native team is already working on this:
facebook/react-native#18095
facebook/react-native#17741