Refactoring and any Improvement

[ha-yi]

Add any improvement and suggestions for this library.

[subbramanil]

Looks like it's been quite a lot of time since the issue was opened. I would like to take a stab at it. Pls, assign it to me.

1. Update to the latest versions of gradle, android libraries & resolve compilation issues
2. Refactor and Improve the code
3. Update the Sample App and add some new screenshots

[subbramanil]

@ha-yi

I submitted a couple of pull requests(#6, #7) that address the 1 & 2. Please review and merge them in the same order to get clarity of the changes made. I will submit another PR for the sample app, screenshots & readme.