Hi! I would suggest you an app named "Shrimad Bhagavad Gita and Gita Saar in English" from Google Play Store.
The application has all the chapters that are in Bhagavad Gita book. And all the chapters are in English language. There is Gita saar also. It has beautiful UI.
The application consists of amazing features like:-
1) Bookmark the chapter that you liked.
2) Read Offline
3) Mark As Read Chapter and many more features.
Hope, this will help you out!