As per 2017, we can say that also in 2018 some mobile app development techniques will be trending. Some of them are as:

1. IoT

2. Artificial Intelligence (AI)

3. AMP (Accelerated Mobile Pages)

4. Augmented Reality  & Virtual Reality (AR & VR)  

Know More at http://www.devtechnosys.com/2017/11/top-mobile-app-development-trends-for-2018-that-everyone-wants-to-watch/