Kana Master is all you need to master Japanese Kana with your Android phone.
There are 2 modes,
In reference mode you can view all hiragana and katakana and study each one, including pronunciation and stroke orders.
In quiz mode you can test your knowledge. The more quiz you have done, the harder the quiz will be. You are scored smartly but the score is not shown to you.
The goal is to learn something without pressure. Study it for a while while you are on a bus, waiting for your dishes, etc. You will master Kana before you notice it!
You can get Kana Master from Google Play. It is also available in SamsungApps.