What are the default font characteristics in Android ?
You can check the default style of the widgets here: android/res/values/styles.xml
Then, looking for Textview you reach
<style name="Widget.TextView"> <item name="android:textAppearance">?android:attr/textAppearanceSmall</item> </style>and after researching a little bit, you find out that this appearance is defined in the same styles.xml file
<style name="TextAppearance.Small"> <item name="android:textSize">14sp</item> <item name="android:textStyle">normal</item> <item name="android:textColor">?textColorSecondary</item> </style>where
<item name="textColorSecondary">@android:color/secondary_text_dark</item>these colors are defined in /res/color/, check /res/color/secondary_text_dark.xml
Bookmarking the android/res/values folder is a must!
Update: my old links are broken, check Android core resources folder on Github. Thanks to kreker for the link.
For the newer 4.0 ICS etc there's the Android design pages which shows a list of font sizes:
http://developer.android.com/design/style/typography.html
All specified as 'sp' units
HTH