What are the skills required for Android app developer?

What skills are required to become an Android developer?

40 leading Android developers to follow on Twitter

Over 18% of android app developers earn over $5,000 per month , and the same amount is earned by 25% of iOS app developers. Video game apps are making money in millions.

Android was created by the Open Handset Alliance, which is led by Google . The early feedback on developing applications for the Android platform was mixed.