There is no certain answer to this question. This can be somewhere very low and somewhere very high depending upon the experience of the developer and the skills they have.
The other factor that makes up for the cost is what is required by the company that wants the application. In this article, we will go through all the points that make up for the total cost to hire an android app developer.
Android developers these days are not hard to find. But, someone who can understand your project and works according to your needs, is a bit tough.
For the same, you need to do some research and ask questions that will give you answers that will help you identify if that developer is worth your hard money or not.