UnknownHostException popup occurs when typing in custom server name

[CryptoGrampy]

Description

If you type in the custom server name by hand, wait a few seconds between characters, an UnknownHostException occurs.

• [X] Can you reproduce the issue?

Steps to reproduce

Delete the server url, start typing, wait a few seconds. If I type in say, a large string of letters, I see 'Please enter a valid URL authority....', but if I type in a string of letters followed by a period or non-text character i.e. api. then it throws the error popup.

Expected behavior:

I expect to be able to type in the url, press save and point MyMonero at my custom url

Actual behavior:

I begin typing the custom URL, it attempts to connect if i pause as I'm tying, and it throws an UnknownHostException popup.

The copied error looks like: ```An unexpected application error occurred. The following error message was encountered:

UnknownHostExceptionMozilla/5.0```

Versions

MyMonero 1.2.8 Android/Calyx OS latest