title: How to create Options for activity
body: <p>i have a couple of questions about activity's</p>
  
  <p>i have a activity which i want to create some options for it. for eg. i want the user to be able to change the font size of text views.</p>
  
  <p>i am a noob in java and eclipse. first i thought i can change the xml values via java but then i found out that i can't and they are read only.</p>
  
  <p>so what is the best solution for creating options which are visual like changing colors and font sizes and picture through entire project?</p>
  
  <p>for eg. i have 10 activities and inside each activity i have some text views. i want to change all of the font sizes. in xml you can create a dimen and all of the text views with <code>android:fontSize:"@dimen/example</code> will have the same size. but in java it takes more code and time.</p>
  
  <p>what should i do ? couple of examples would be nice</p>
  
  <p>thanks in advance</p>