It is possible to mine Bitcoin on Android, but it is not as profitable as it used to be. In the early days of Bitcoin, it was possible to mine the cryptocurrency on a regular desktop computer. However, as more and more people began mining Bitcoin, the difficulty level of the mining process increased, making it necessary to use specialised hardware known as ASICs. ASICs are far more expensive than regular computers, and they consume a lot of electricity.
For these reasons, mining Bitcoin on Android is no longer profitable. There are still a few people who do it, but they are not likely to make much money from it.