How do you display a 2 digit NumberPicker in android?

问题

I want to create a timer and since I couldn't create a digital interface that is editable for the user to set the time I want to use the NumberPicker. However the NumberPicker only displays 1 digit for the numbers between 0-9. How do you format the picker so that it will display two digits such as 01 02 03 and so forth.

回答1:

    numberPicker.setMaxValue(10);
    numberPicker.setMinValue(0);
    numberPicker.setFormatter(new NumberPicker.Formatter() {
        @Override
        public String format(int i) {
            return String.format("%02d", i);
        }
    });

This will do the trick!

回答2:

Implement a custom NumberPicker.Formatter that implements your value display padding and call setFormatter.

回答3:

 NumberPicker monthPicker = (NumberPicker) view.findViewById(R.id.np_month);
        monthPicker.setMinValue(1);
        monthPicker.setMaxValue(12);
        monthPicker.setFormatter(new NumberPicker.Formatter() {
            @Override
            public String format(int i) {
                return String.format("%02d", i);
            }
        });

来源：https://stackoverflow.com/questions/19737755/how-do-you-display-a-2-digit-numberpicker-in-android