I do not know English so I don't know very specific nouns for things. My question is how's the highlighted message box called. I want to implement similar message in my application, but I can't without even knowing its name. In case this is not the correct website for a question like this, I'm sorry, but I have no idea where to ask this.
It's a Toast.
A toast provides simple feedback about an operation in a small popup. It only fills the amount of space required for the message and the current activity remains visible and interactive. Toasts automatically disappear after a timeout.
It's called a Toast message and you can use one in your application very easily with the below codes
Using a String in /values/strings
Toast.makeText(this, String.format(this.getString(R.string.Toast), dst), Toast.LENGTH_SHORT).show();
Using a String in code