Blackberry RichTextField validation

I have created a RichTextField and I want to have it allo开发者_如何学Cw only integer values. How can I make that happen?

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You can try something like this:

public class MyRichTextField extends RichTextField {

    public MyRichTextField() {
        super();
    }

    public void setText(String text) {
        try {
            int x = Integer.parseInt(text);
            super.setText("" + x);
        } catch (NumberFormatException e) {
            // the text is not a number
            super.setText("");
        }
    }
}