MarginTop between radio buttons for Different Screen Densities in Android - android-layout

Question

Im trying to make a layout for a survey question, it works fine on my device but the margin between the radio button text decreases on a better screen resolution device.
I have tried creating different DIMENS it works but I'm not sure how to scale the margin based on different sizes.
Kindly suggests what screen size values-swXXX folder I need to create and what should be the scaling factor of the DIMEN I have defined.
Thanks
enter code here
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<TextView
android:id="#+id/tv_1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="10dp"
android:text="How often do you use it?"
android:textSize="15sp" />
<RadioGroup
android:id="#+id/rg_1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/tv_1"
android:layout_below="#+id/tv_1" >
<RadioButton
android:id="#+id/rb_once"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="5dp"
android:layout_marginTop="15dp"
android:button="#drawable/radio_btn"
android:checked="true"
android:text="Once" />
<RadioButton
android:id="#+id/rb_daily"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/rb_once"
android:layout_marginLeft="5dp"
android:layout_marginTop="5dp"
android:button="#drawable/radio_btn"
android:text="Daily" />
<RadioButton
android:id="#+id/rb_weekly"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/rb_daily"
android:layout_marginLeft="5dp"
android:layout_marginTop="5dp"
android:button="#drawable/radio_btn"
android:text="Weekly" />
<RadioButton
android:id="#+id/rb_monthly"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/rb_weekly"
android:layout_marginLeft="5dp"
android:layout_marginTop="5dp"
android:button="#drawable/radio_btn"
android:text="Monthly" />
</RadioGroup>
<ImageView
android:id="#+id/fb_share"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_margin="10dp"
android:src="#drawable/facebook_share" />
<ImageView
android:id="#+id/history"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignTop="#+id/fb_share"
android:layout_marginLeft="10dp"
android:src="#drawable/history" />
<ImageView
android:id="#+id/info"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignTop="#+id/fb_share"
android:layout_marginRight="10dp"
android:src="#drawable/info" />
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_above="#+id/fb_share"
android:layout_below="#+id/rg_1"
android:layout_centerHorizontal="true" >
<Button
android:id="#+id/send"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:background="#drawable/red_btn"
android:fontFamily="Roboto-Italic"
android:text="SAVE"
android:textColor="#ffffff" />
</RelativeLayout>
</RelativeLayout>

Answer 1

You need to create values-swXXXX folders wrt devices you are targetting for. i.e If you are targetting for a tablet with minimum width of 600, then you need to create values-sw600 and so on.
In layout file, change declaration of RadioButton as below:
<RadioButton
android:id="#+id/rb_once"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="#dimen/left_margin"
android:layout_marginTop="#dimen/top_margin"
android:button="#drawable/radio_btn"
android:checked="true"
android:text="Once" />
And maintain dimen.xml specific to each targeted dimension under values-swXXXX with dimension keys having same name but values corresponding to respective dimension. Ex:
values/
<dimen name="left_margin">5dp</dimen>
<dimen name="left_margin">10dp</dimen>
values-sw600/
<dimen name="left_margin">20dp</dimen>
<dimen name="left_margin">40dp</dimen>