i would like to make an mobile app who can write "texts" to a txt file on a server.
it is possible?
You want to use a TextBox for them to enter a block of text and then submit it to a server via HTTP POST. Then you can have PHP (or Python or whatever your server programming language is) turn this into a file on your server.
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do you have somE capx
I can. Most of the work is on the server, so this will be of limited use.
So here you go: https://drive.google.com/open?id=0B-xiq ... 01uMTdoY0k