How can I use resources in different folders to support multiple screens

See more:

Android

I am new to andriod. I am designing layouts for one app that supports maximum number of android devices. I crated xml files for all my activities. By default these files are in layout folder. These layouts are ok for nexus 4. Now I want to use these layouts for nexus 9 tablet. So, I made another folder layout-sw1536dp and copied all my xml files in this directory. I also created folder values-sw1536dp and created one dimens.xml and defined all integer values here. The problem is when I run my app using nexus 9, it uses values from default values folder instead of using values-sw1536dp. How can I solve this?

Here is my code of values/dimens.xml :

<pre lang="xml">
<resources>
    <!-- Default screen margins, per the Android Design guidelines. -->
    <dimen name="activity_horizontal_margin">16dp</dimen>
    <dimen name="activity_vertical_margin">16dp</dimen>
    <dimen name="fab_margin">16dp</dimen>

    <dimen name="activity_title_textview_textsize">12dp</dimen>
    <dimen name="activity_title_height">40dp</dimen>
    <dimen name="activity_nextbutton_textsize">12dp</dimen>
    <dimen name="activity_nextbutton_height">40dp</dimen>
    <dimen name="all_edittextsize">10dp</dimen>
    <dimen name="internal_RL_item_height">40dp</dimen>
    <dimen name="internal_RL_item_margin">20dp</dimen>
    <dimen name="imagesize">20dp</dimen>
    <dimen name="toolbar_height">40dp</dimen>
    <dimen name="toolbar_textsize">12dp</dimen>
    <dimen name="big_of_three_img">60dp</dimen>
    <dimen name="three_img">40dp</dimen>
    <dimen name="dots_height">10dp</dimen>
    <dimen name="dots_width">30dp</dimen>
</resources>

this is the code for values-sw1536dp/dimens.xml

<resources>
    <!-- Default screen margins, per the Android Design guidelines. -->
    <dimen name="activity_horizontal_margin">16dp</dimen>
    <dimen name="activity_vertical_margin">16dp</dimen>
    <dimen name="fab_margin">16dp</dimen>

    <dimen name="activity_title_textview_textsize">20dp</dimen>
    <dimen name="activity_title_height">60dp</dimen>
    <dimen name="activity_nextbutton_textsize">20dp</dimen>
    <dimen name="activity_nextbutton_height">60dp</dimen>
    <dimen name="all_edittextsize">15dp</dimen>
    <dimen name="internal_RL_item_height">60dp</dimen>
    <dimen name="internal_RL_item_margin">30dp</dimen>
    <dimen name="imagesize">40dp</dimen>
    <dimen name="toolbar_height">60dp</dimen>
    <dimen name="toolbar_textsize">15dp</dimen>
    <dimen name="big_of_three_img">80dp</dimen>
    <dimen name="three_img">60dp</dimen>
    <dimen name="dots_height">20dp</dimen>
    <dimen name="dots_width">40dp</dimen>
</resources>