A free program for Android, by Dragoma.

In addition to being a dictionary, Dragoma is also a learning tool. It allows you to study and improve your vocabulary in different ways: by listening to the pronunciation, reading the translations of the words you have learned, and even practicing writing the words and checking your pronunciation.

How do I use it?

First of all, you need to install the Dragoma dictionary. It is free to use. 

Once you have installed it, you will be able to use it anytime, anywhere, and even while you are offline. To learn vocabulary, you can use the Dragoma dictionary to listen to the pronunciation of the words you have learned, read the translations, and check the pronunciation.

If you want to practice writing, you can use the Dragoma dictionary to write and check your pronunciation.