Well, first and foremost, i cannot help correcting your sentence before giving any answer. "Do you think TO learn English well is to DO listening comprehension WELL" I believe English grammar has the beauty of balance and keep in mind don't ruin it. I do think there is a link between listening and speaking, so is reading and writing, WHICH MEANS YOU CAN MAKE ONE UP BY PRACTICING ANOTHER AND OUTPUT IT! AND SPEAK OUT THE WORD, IDIOM, GRAMMAR, SENTENCE YOU HAVE LEARNRED IN REPEATED LISTENING. So, yes and no.

No, I don't think so. Oral English is about speaking skills. Listening comprehension is about listening skills. The skills are very different. Many learners can comprehend well but speak relatively badly. Learners who can speak very well, on the other hand, all seem to possess reasonable listening skills.