How would I automate repetitive tasks in Android?

There are many tasks I do repetitively, like connect a Bluetooth headset or connect to a hotspot. How do I typically "code" this? How do I execute? Is there a consistent library or package manager, or do I have to collect from everywhere? Any community projects? Anything that works consistently over several platforms? Is there some framework to execute over several devices? (In the Bluetooth example I might want to disconnect other devices at the same time)