1- Create the repository on your Bitbucket account
2- Create your project in Android Studio
3- In Android Studio, Go to VCS
4- Choose 'Enable version control'
5- Choose Git and press OK
6- Right click on your project, choose Git then click Add
7- Open Terminal in Android studio
8- Go to your Bitbucket repository Overview
9- Click on 'I have an existing Project'
10- Copy the 'git remote add origin ... etc' line to your terminal and press enter
11- Click on 'Commit Changes', write your comment then press Commit and push