android - Dynamic Text size change according to tablet

Question

With all effort,I finally reached to the end of my first app in android. And thanks to all. But after coming to end, I realized one thing that my app text size is common in all tablet sizes. So I will re frame my question.

Problem: I used my own custom text size in entire app. and some what satisfied with 7 inch tablet. But when I am looking the same thing in 8.9 inches and 10.1 inch tablet its containing lots of white spaces and text size are also relatively small. So is there some way that I can change the text size according to my tablet size??? It may look novice question but I am struggling with this because the same app which look wonderful in 7 inches, is loosing its essence in 8.9 and 10.1 inches. Or there is something else which I could do with my app for the same. Probable Solution:- As my topic indicates is there some way to change the text size as tablet size changes. Either dynamically or any other way.

EDITED:: As per Cheeta answer, approach is correct but I can't do it for each layout buttons and textfields and other field. There are hundreds of field like this in single app. Can I do it in some one place and call it required attribute. Is custom tag is approach which I am looking for.Is it possible????

Any help will be appreciated. Thanks in advance.

NOTE I have not reached to a answer but cheetah answer is somewhat leading to correct way. I am marking his answer as correct although there are few alignment issue with his answer. Any other answer is always welcome. Thanks

Answer 1

After checking some resources I finally came up with the following solution: Within the layout-xml I define the size of the button-text with a dimension declaration:

android:textSize="@dimen/campaign_textfontsize"

I created a dimens.xml in the "/values"-subdirectory with the corresponding value

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <dimen name="campaign_textfontsize">18dp</dimen>
</resources>

then I created a second values-folder "/values-sw720dp" and copied the old dimens.xml into it. In this dimens.xml I adapted the fontsize value:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <dimen name="campaign_textfontsize">24dp</dimen>
</resources>

Based on the current screensize android selects the proper dimens-value. So without any code, font is adapted to the display- (and display related button-) size.

Hope this helps...