Pursuing the skills of core Java which leads to android development would require 3-4 months. Mastering the same is expected to take 1 to 1.5 years . Thus, in brief, if you are a beginner, it is estimated to take you around two years to have a good understanding and to start with android development projects.
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Course 1 of 5 in the Android App Development Specialization. This MOOC teaches you how to program core features and classes from the Java programming language that are used in Android , which is the dominant platform for developing and deploying mobile device apps.
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