To become an app developer where you can learn different programming languages, usage of algorithms and application of coding in various fields, you need to do B.Tech in Computer Science Engineering then only you will be able to learn all the things needed and with lots of hard work and determination you can become a successful app developer. To enhance your skills after graduation you can do masters i.e. M.Tech degree in computer science field with the specialization related to Android that will help you to come closer to your interest.

Feel free to ask if you have any more queries. All the best!!