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I wanna whether I can use Javascript to develop an Android Apps. Besides, what is the differences between using Java and Javascript in order to develop an Android App. Finally, is Java or Javascript easier for a beginner to learn so as to develop an App?
java is to javascript what ham is to hamster (i do really like this analogy), they are completely different languages serving very different purposes, for android apps you need java. The end. Javascript is out of the question (well, you could use js + html + css and phonegap but only for small apps)
Java is the language for android, you should learn it if you purpose is to build android apps. Which is easier? That is a endless argument, i would argue javascript to get started, but you need to learn Java.