Question

I am trying to print a randomly generated integer to the screen. I looked at a couple other people’s questions on how to do it and here is my attempt:

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_program);
        TextView currentNumber = new TextView(this);
        // randNum() generates the random number and returns it (returns int)
        currentNumber.setText(randNum()); 
        this.setContentView(currentNumber);
    }

When I try to open the current activity, however, (emulator) the app stops working. What am I doing wrong? Also, I will be planning on allowing the user to generate a new random number later on and I want the display to update the currentNumber variable (overwriting the first number). Is this the best way of doing it or is there a better way?

Answer 1

randNum() I assume is an int. When you pass an int to setText(), it interprets as a resource, which you don’t want.

Try this:

currentNumber.setText(String.valueOf(randNum()));

Or, if you prefer (less efficient, but maybe more readable):

currentNumber.setText(randNum() + "");

NB: Also, when you get crashes in the future, please post the full red section of the LogCat for us to help you debug.