Here is how I did it without plugins:
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Create the repository on your Bitbucket account
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Create your project in Android Studio
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In Android Studio, Go to VCS
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Choose ‘Enable version control’
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Choose Git and press OK
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Right click on your project, choose Git then click Add
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Open Terminal in Android Studio
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Go to your Bitbucket repository Overview
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Click on ‘I have an existing Project’
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Copy the ‘git remote add origin … etc.’ line to your terminal and press enter
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Click on ‘Commit Changes’, write your comment then press Commit and push
Also add the ‘git push -u origin master’ in the terminal at part 10 of above