To make some project using Android app developer, the person who has skills in Java, Eclipse IDE for Java and SQL are required by you for completing your project. Java is very essential in making these types of projects. So you must select one who knows Java in a better way so he can make it error free for the users and you can solve different problem during you project easily. The location of the person is not very important as compared to skills and experience in this world because you have do your work will be able to complete the project by hiring different people over the internet. According to the latest surveys for making an average mobile program will be cost you around three thousand to eight thousand dollars and for more complex programs which are required to build can cost you more so the project cost will also increase.