Record android external jack sound [closed]

Good morning everyone.

First forgive me because I thought that this question should be in English, not Spanish.

Now, I'll rectify and I'll put it in that language:

I would like to record the sound that comes through the jack input of my Android phone.

I've been looking for the different kinds of android and I've found in the audio capture different preferences, but I can not find where you can define if you use the phone's mic or the external one connected by jack.

I would like to use only the micro / whatever is connected from the jack.

Is there an example? How should I do it?

• info that I found = > link

Thanks