CustomNumberPicker.java

package com.chamoapp.haegu;

...

public class CustomNumberPicker extends NumberPicker {
	public CustomNumberPicker(Context context, AttributeSet attrs) {
		super(context, attrs);

		NumberPicker numberpicker = null;
		
		try {
			numberpicker = (NumberPicker) findViewById(R.id.home_exchange_picker);
		} catch (IllegalArgumentException e) {
			e.printStackTrace();
		}

		Class<?> numberPickerClass = null;
		try {
			numberPickerClass = Class.forName("android.widget.NumberPicker");
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		}

		Field selectionDivider = null, selectionDividersDistance = null;
		
		try {
			selectionDivider = numberPickerClass.getDeclaredField("mSelectionDivider");
			selectionDividersDistance = numberPickerClass
			        .getDeclaredField("mSelectionDividersDistance");
		} catch (NoSuchFieldException e) {
			e.printStackTrace();
		}

		selectionDividersDistance.setAccessible(true);
		selectionDivider.setAccessible(true);

		Resources r = context.getResources();
		float px = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 
		        16, r.getDisplayMetrics());

		try {
			selectionDividersDistance.set(numberpicker, (int) px);
			selectionDivider.set(numberpicker, getResources()
			         .getDrawable(R.color.numberpicker_divider_color));
		} catch (IllegalAccessException e) {
			e.printStackTrace();
		} catch (IllegalArgumentException e) {
			e.printStackTrace();
		} catch (NotFoundException e) {
			e.printStackTrace();
		}
	}

	@Override
	public void addView(View child) {
		super.addView(child);
		updateView(child);
	}

	@Override
	public void addView(View child, int index, android.view.ViewGroup.LayoutParams params) {
		super.addView(child, index, params);
		updateView(child);
	}

	@Override
	public void addView(View child, android.view.ViewGroup.LayoutParams params) {
		super.addView(child, params);
		updateView(child);
	}

	private void updateView(View view) {
		if (view instanceof EditText) {
			((EditText) view).setTextSize(12);
			((EditText) view).setTextColor(Color.parseColor("#FFFFFF"));
			((EditText) view).setEnabled(false);
		}

	}
}