I would need to advise an effective Android application for learning German. Especially for vocabulary. It would be ideal for Czech speeking user but for English speeking user it would be good too. I already know some German grammar from school and some basic things too, I can verbalize. I tried several apps (3 commertial of it). All have fine pictures to click (e.g. choose the correct choice 1 from 6), there is also recorded speaker, sometimes also sentences and sometimes also recapitulation. "choice 1 from 6" looks probably pleasingly but it is too soft criterion of mastery. There is also limited lexicon (up to 500 words) which is rather suitable for beeing able to speak at a touristic trip in a foreign country. However it is not suitable for living and working there. I am annoyed by always looking to dictionary for beeing able to read or write something in German. Normally I don't remember the words for the first (or second or third) time so I must watch to the vocabulary next time again and again... I have not still found any application which would teach anybody more and thoroughly and would be eventually also extendable by the new custom words which I realy need. Anyone know about such a thing?