Android XML adapted for all scree sizes - size

Question

I am currently developing an android application and am facing a problem.
I am aware that the most common thing to adapt your application to most of the devices is to create different folder named "layout-small", "layout-normal", etc. in order to handle this issue.
However, this does not solve everything : both Samsung S2 and Samsung S3 and considered "normal" screen size, but the given result is very different, even though I also use "dp" to set height and with of most of my views.
How can I adapt my xml for EVERY device PERFECTLY ? I don't mind having the same xml file for every different device, but how do I do that ?
Here is an example of an XML file that renders welle on S3, but is cut down on S2 (the last button appears partially)
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/white"
android:useDefaultMargins="false">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:layout_marginBottom="10dp"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Me"
android:id="#+id/textView"
style="#style/title_parameters"
android:layout_alignParentTop="true"
/>
<Button
android:id="#+id/btUpdateProfile"
android:layout_width="fill_parent"
android:layout_height="50dp"
android:text="Update profile"
android:textColor="#drawable/text_color_selected_parameters"
style="#style/button_text"
android:background="#drawable/solo_button_parameters"
android:drawableRight="#drawable/table_view_cell_accessory_disclosure_indicator"
android:layout_below="#+id/textView"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:layout_marginBottom="10dp"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Friends"
android:id="#+id/textView2"
style="#style/title_parameters"
android:layout_below="#+id/btUpdateProfile"/>
<Button
android:id="#+id/btFindFriends"
android:layout_width="fill_parent"
android:layout_height="50dp"
android:text="Find friends"
android:textColor="#drawable/text_color_selected_parameters"
style="#style/button_text"
android:background="#drawable/solo_button_parameters"
android:drawableRight="#drawable/table_view_cell_accessory_disclosure_indicator"
android:layout_below="#+id/textView2"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
android:layout_marginBottom="10dp"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Setting"
android:id="#+id/textView3"
style="#style/title_parameters"
android:layout_below="#+id/btFindFriends"/>
<Button
android:id="#+id/btSharing"
android:layout_width="fill_parent"
android:layout_height="50dp"
android:text="Sharing"
android:gravity="top"
android:textColor="#drawable/text_color_selected_parameters"
style="#style/button_text"
android:background="#drawable/top_corner_button_parameters"
android:drawableRight="#drawable/table_view_cell_accessory_disclosure_indicator"
android:layout_below="#+id/textView3"/>
<Button
android:id="#+id/btPushNotification"
android:layout_width="fill_parent"
android:layout_height="50dp"
style="#style/button_text"
android:textColor="#drawable/text_color_selected_parameters"
android:text="Push notification"
android:layout_marginTop="-2dp"
android:background="#drawable/rectangle_button_parameters"
android:drawableRight="#drawable/table_view_cell_accessory_disclosure_indicator"
android:layout_below="#+id/btSharing"/>
<Button
android:id="#+id/btAutomation"
android:layout_width="fill_parent"
android:layout_height="50dp"
android:gravity="bottom"
android:text="Automation"
style="#style/button_text"
android:background="#drawable/bottom_corner_button_parameters"
android:drawableRight="#drawable/table_view_cell_accessory_disclosure_indicator"
android:layout_below="#+id/btPushNotification"
android:textColor="#drawable/text_color_selected_parameters"
android:layout_marginTop="-2dp"/>
<Button
android:id="#+id/btDisconnect"
android:layout_width="fill_parent"
android:layout_height="50dp"
android:text="Disconect"
android:layout_marginTop="20dp"
android:textColor="#drawable/text_color_selected_parameters"
style="#style/button_text"
android:background="#drawable/solo_button_parameters"
android:drawableLeft="#drawable/disconnect"
android:layout_below="#+id/btAutomation"
android:layout_marginBottom="30dp"/>
</RelativeLayout>
I will upload screen shots as soon as I can.
Once again, my question is : how can I have an XML file for every existing device ?

Answer 1

Can you please post some code. It will be better.
Without define fixed size relative layout and use its positional attributes properly. (This is a comment )