android - Emulator don't jobs correctly with dps -

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i have simple layout, have 1 button. 

<button     android:id="@+id/button1"     android:layout_width="200dp"     android:layout_height="80dp"     android:text="button"/>

i want see button scale correctly in different densities. created 3 emulators, different abstracted lcd density (120,160 , 240).

when run application in tree emulators, button size bigger in each emulator. if read hight , width of button in pixels can see size right.

is there problem density in emulator?

the version of android ics.

thank much.

edit.

i upload images problem. first images in 160 densities , seconds have 240.

screen_with_160_screen_home
screen_with_240_screen_home

you can see elements ara bigger in 240, home screen.

//according density differ when use dp or dip

if 200dp in 120 dpi=200×120÷160=150px if 200dp in 160 dpi=200×160÷160=200px if 200dp in 240 dpi=200×240÷160=300px

this dp/dip auto scale

if want fixed size mean need use px

best practices:


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