I defined an EditText-field and I want to be informed when the user edits that fields. So I thought: simple - I add an OnKeyListener and so I did. But even though the text f
You say that you're dealing with an EditText, but your code refers to a TextView. My guess is that you have an EditText in your layout XML files, but you're referring to this newly created TextView in your code, which is in fact not even in the app's UI at all.
If there is already an EditText in your layout XML file, then you need to get a pointer to it in your Java code, probably using the findViewById() method. Then add your OnKeyListener to that EditText.
Defining your layout in XML actually makes a lot more sense (at least in many, if not most, cases) than defining it one component at a time and then adding each those components to the UI, like you do in Swing. But it takes some getting used to, no question.