EditText maxLines not working - user can still input more lines than set

The attribute maxLines corresponds to the maximum height of the EditText, it controls the outer boundaries and not inner text lines.

<EditText
    android:id="@+id/edit_text"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:inputType="text"
    android:maxLines="1" 
/>

You just need to make sure you have the attribute "inputType" set. It doesn't work without this line.

android:inputType="text"

@Cedekasem you are right, there isn't a built in "row limiter". But I did built one my self, so if anyone is interested the code is below. Cheers.

et.setOnKeyListener(new View.OnKeyListener() {

        @Override
        public boolean onKey(View v, int keyCode, KeyEvent event) {

            // if enter is pressed start calculating
            if (keyCode == KeyEvent.KEYCODE_ENTER
                    && event.getAction() == KeyEvent.ACTION_UP) {

                // get EditText text
                String text = ((EditText) v).getText().toString();

                // find how many rows it cointains
                int editTextRowCount = text.split("\\n").length;

                // user has input more than limited - lets do something
                // about that
                if (editTextRowCount >= 7) {

                    // find the last break
                    int lastBreakIndex = text.lastIndexOf("\n");

                    // compose new text
                    String newText = text.substring(0, lastBreakIndex);

                    // add new text - delete old one and append new one
                    // (append because I want the cursor to be at the end)
                    ((EditText) v).setText("");
                    ((EditText) v).append(newText);

                }
            }

            return false;
        }
});

This does not solve the general issue of limiting to n lines. If you want to limit your EditText to take just 1 line of text, this can be very easy.
You can set this in the xml file.

android:singleLine="true"

or programmatically

editText.setSingleLine(true);