Android: Setting Button Margin and Button Width Depending Screen Density -

i have device following features:

resolution: 1080 x 1920
density: 480 dpi (xxhdpi)
screen size: normal
scaled density: 3.0

i've created bitmap has 960x1440 resolution. bitmap has rectangle size 795x150 px , it's positions x:150 px , y:900 px on bitmap.

i put bitmap in drawable-xxhdpi folder.

my xml code in layout folder is:

<?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:orientation="vertical"     android:background="@drawable/loginscreen" >      <button         android:id="@+id/button1"         android:layout_width="265dp"         android:layout_height="50dp"         android:layout_marginleft="@dimen/login_button_left_margin"         android:layout_margintop="@dimen/login_button_top_margin" />  </linearlayout 

my dimes.xml file in values folder this:

<resources>      <!-- default screen margins, per android design guidelines. -->     <dimen name="login_button_top_margin">300dp</dimen>     <dimen name="login_button_left_margin">50dp</dimen>  </resources> 

bacause of device's screen size normal used layout , values folders trial. had hoped button overlap rectangle on bitmap. button stands above rectangle , size of button is'nt equal size of rectangle. dp values supposed multiplyed 3?

create folder under res folder name layout-large , copy layout folder files(.xml) layout-large folder , change code layout-large

android:layout_width="68dp"             android:layout_height="68dp" 

android automatically take large size in largetab small phone it's takevalues layout folder