Question: I know only basic HTML 

I want to put a text box on my website in which if a user enters his order number, it will open the link to that order summary.

The links to those order summary are saved on my web server in the format of ORDERNUMBER-DATE (example: <http://www.mywebsite.com/orders/OD12354-22.02.14.html>)

All I want is 2 text boxes where the user enters order number and a date.
on clicking submit, it should take the user to the link automatically.

Answer: 
Although technically not changing the font size, the size of the text can be changed by changing the scale of the entire NumberPicker View.

```
<NumberPicker
    android:id="@+id/number_picker"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:scaleX=".7"
    android:scaleY=".7"/>

```
Based on **John Starbird** answer.

You add style.

```
<style name="NumberPickerText">
    <item name="android:textSize">11sp</item>
</style> 

```

Add style to your Number Picker in XML.

```
android:theme="@style/NumberPickerText"

```