NumberPicker numberPicker = (NumberPicker) findViewById(R.id.number_picker);

// Set divider color
numberPicker.setDividerColor(ContextCompat.getColor(this, R.color.colorPrimary));
numberPicker.setDividerColorResource(R.color.colorPrimary);

// Set formatter
numberPicker.setFormatter(getString(R.string.number_picker_formatter));
numberPicker.setFormatter(R.string.number_picker_formatter);

// Set selected text color
numberPicker.setSelectedTextColor(ContextCompat.getColor(this, R.color.colorPrimary));
numberPicker.setSelectedTextColorResource(R.color.colorPrimary);

// Set selected text size
numberPicker.setSelectedTextSize(getResources().getDimension(R.dimen.selected_text_size));
numberPicker.setSelectedTextSize(R.dimen.selected_text_size);

// Set selected typeface
numberPicker.setSelectedTypeface(Typeface.create(getString(R.string.roboto_light), Typeface.NORMAL));
numberPicker.setSelectedTypeface(getString(R.string.roboto_light), Typeface.NORMAL);
numberPicker.setSelectedTypeface(getString(R.string.roboto_light));
numberPicker.setSelectedTypeface(R.string.roboto_light, Typeface.NORMAL);
numberPicker.setSelectedTypeface(R.string.roboto_light);

// Set text color
numberPicker.setTextColor(ContextCompat.getColor(this, R.color.dark_grey));
numberPicker.setTextColorResource(R.color.dark_grey);

// Set text size
numberPicker.setTextSize(getResources().getDimension(R.dimen.text_size));
numberPicker.setTextSize(R.dimen.text_size);

// Set typeface
numberPicker.setTypeface(Typeface.create(getString(R.string.roboto_light), Typeface.NORMAL));
numberPicker.setTypeface(getString(R.string.roboto_light), Typeface.NORMAL);
numberPicker.setTypeface(getString(R.string.roboto_light));
numberPicker.setTypeface(R.string.roboto_light, Typeface.NORMAL);
numberPicker.setTypeface(R.string.roboto_light);

// Set value
numberPicker.setMaxValue(59);
numberPicker.setMinValue(0);
numberPicker.setValue(3);

// Using string values
// IMPORTANT! setMinValue to 1 and call setDisplayedValues after setMinValue and setMaxValue
String[] data = {"A", "B", "C", "D", "E", "F", "G", "H", "I"};
numberPicker.setMinValue(1);
numberPicker.setMaxValue(data.length);
numberPicker.setDisplayedValues(data);
numberPicker.setValue(7);

// Set fading edge enabled
numberPicker.setFadingEdgeEnabled(true);

// Set scroller enabled
numberPicker.setScrollerEnabled(true);

// Set wrap selector wheel
numberPicker.setWrapSelectorWheel(true);

// Set accessibility description enabled
numberPicker.setAccessibilityDescriptionEnabled(true);
        
// OnClickListener
numberPicker.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        Log.d(TAG, "Click on current value");
    }
});

// OnValueChangeListener
numberPicker.setOnValueChangedListener(new NumberPicker.OnValueChangeListener() {
    @Override
    public void onValueChange(NumberPicker picker, int oldVal, int newVal) {
        Log.d(TAG, String.format(Locale.US, "oldVal: %d, newVal: %d", oldVal, newVal));
    }
});

// OnScrollListener
numberPicker.setOnScrollListener(new NumberPicker.OnScrollListener() {
    @Override
    public void onScrollStateChange(NumberPicker picker, int scrollState) {
        if (scrollState == SCROLL_STATE_IDLE) {
            Log.d(TAG, String.format(Locale.US, "newVal: %d", picker.getValue()));
        }
    }
});