You are able to use the indicators that are available for the app by default. To view these please navigate to the ‘Chart’ tab. Please tap on this screen and a pop up window will appear. Scroll down for the full list.
How do I download the Android app for MetaTrader 4 (MT4)?
How do I log in to my account using the Android apps for MT4?
How do I place a trade on the Android app for MT4?