What kind of tool can be used to design an Android application?

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I'm wondering what kind of tool can be used to design a Android app? I mean I can write down my ideas on a paper list but I'm pretty sure there is a more efficient and moderne way to design my (futures!) android activities :-) Basically, what kind of tool beginners usually used to write down all their ideas, android activities,database,..and so on.

Thank you


http://proto.io/

http://www.justinmind.com/prototyper/free-edition

https://mockingbot.com/

https://www.fluidui.com/

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