random number generator java

I'm trying to create a basic app in android to get a feel for android studio. I want it to produce a random number between 2 given inputs (high and low) and display that number in a list of the last 5. This is the code I have now, and as it currently works, it's setting 'low' to the high limit, I've racked my mind around this issue for a while and can't come up with an answer.

public class MainActivity extends AppCompatActivity implements View.OnClickListener{


    /**
     * Create all instance variables
     */
    int high, low, r;
    ArrayList<Integer> numList = new ArrayList<>(5);
    boolean firstNum = true;
    Random random = new Random();

    /**
     * Bind the IDs made in the xml with the objects being used in main
     * using butterknife
     */
    @BindView(R.id.lowestNum) EditText min;
    @BindView(R.id.highestNum) EditText max;
    @BindView(R.id.currentRando) TextView rando;
    @BindView(R.id.randoList) TextView randoList;
    @OnClick (R.id.genBtn)


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    /**
     * Adds a given number to the list of numbers on the screen.
     * If the list size gets over 5, it also gets rid of the oldest
     * number in the list after adding the new number to it
     *
     * @param x - number to be added to the list
     * @return the completed list after x is added
     */
    private ArrayList<Integer> updateList(int x){
        if(numList.size() <= 4) {
            numList.add(x);
        } else {
            numList.remove(0);
            numList.add(x);
        }
        return numList;
    }

    /**
     * Takes in a list of numbers and formats them to be easily read
     * by the user on the main screen
     *
     * @param myNums The list of numbers to be formatted
     * @return The list in a formatted string to display on screen
     */
    private String listHelper(ArrayList<Integer> myNums){
        String l = "";
        if(firstNum) {
            l = "" + myNums.get(0);
            firstNum = false;
        } else {
            for (int i = 0; i < myNums.size(); i++) {
                if(i != myNums.size()-1)
                    l = l  + myNums.get(i) + ", ";
                else
                    l = l + myNums.get(i);
            }
        }
        return l;
    }

    /**
     * Generates the random number for the user
     * @param view
     */
    @OnClick(R.id.genBtn)
    public void onClick(View view) {
        high = Integer.parseInt(max.getText().toString());
        low = Integer.parseInt(min.getText().toString());
        r = random.nextInt(high - low + 1) + low;
        rando.setText("" + random);
        updateList(r);
        randoList.setText("" + listHelper(numList));
    }
}

Thanks in advance!