What's the right way to extend EditText to give it additional “default” functionality

Question

I\'m wondering if it\'s possible to add functionality to EditText such that when I include my newly extended field in the layout xml, I don\'t have to then add any code to the A

Answer 1

Actually there is nothing complicated about that. Usually you would apply a InputFilter to your EditText in your code and this would do the job. But if you see a pattern in that and want a EditText which always behaves that way you could create a custom widget that way:

public class PhoneEditText extends EditText {

    public PhoneEditText(Context context) {
        super(context);
        init();
    }

    public PhoneEditText(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public PhoneEditText(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init();
    }

    private void init() {
            // set your input filter here
    }
}

In XML layout you would simply use the full path to your custom class instead EditText:

<my.package.path.to.PhoneEditText
   attribute="value (all EditText attributes will work as they did before)" />