Android: Why the layout changes when I delete the drawable-hdpi folder -

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i developing layout 320dp devices. have layout-sw320dp have following code displaying 6 imagebuttons. 

<android.support.v4.widget.drawerlayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/drawer_layout" android:layout_width="match_parent" android:layout_height="match_parent" android:elevation="4dp" >  <!-- main content view --> <framelayout     android:id="@+id/content_frame"     android:layout_width="match_parent"     android:layout_height="match_parent" >      <gridlayout         android:layout_width="match_parent"         android:layout_height="match_parent"         android:rowcount="3"         android:columncount="2"         android:paddingtop="10dp"         android:paddingleft="@dimen/activity_horizontal_margin">          <imagebutton             android:layout_row="0"             android:layout_column="0"             android:padding="10dp"             android:src="@drawable/info_image_button_90_90"             android:id="@+id/info_image_button" />          <imagebutton             android:layout_row="0"             android:layout_column="1"             android:padding="10dp"             android:src="@drawable/matri_image_button_90_90"             android:id="@+id/event_imgae_button" />          <imagebutton             android:layout_row="1"             android:layout_column="0"             android:padding="10dp"             android:src="@drawable/events_image_button_90_90"             android:id="@+id/image_button_10" />          <imagebutton             android:layout_row="1"             android:layout_column="1"             android:padding="10dp"             android:src="@drawable/ann_image_button_90_90"             android:id="@+id/image_button_11" />          <imagebutton             android:layout_row="2"             android:layout_column="0"             android:padding="10dp"             android:src="@drawable/events_image_button_90_90"             android:id="@+id/image_button_20" />          <imagebutton             android:layout_row="2"             android:layout_column="1"             android:padding="10dp"             android:src="@drawable/events_image_button_90_90"             android:id="@+id/image_button_21" />      </gridlayout> </framelayout>  <!-- navigation drawer  --> <listview     android:layout_width="240dp"     android:layout_height="match_parent"     android:id="@+id/drawer_list_view"     android:layout_gravity="start"     android:background="@color/white"     android:fitssystemwindows="true"      />  </android.support.v4.widget.drawerlayout>

i have images (90x90) imagebutton in drawable-ldpi. till layout looks this

enter image description here

but when add folder drawable-hdpi have same images in drawable-ldpi, layout changes this

enter image description here

why layout changed? while having same device (nexus one) , same images (90x90)

if developing 320dpi, should xhdpi.

from developer.android.com:

a set of 6 generalized densities:

ldpi (low) ~120dpi mdpi (medium) ~160dpi hdpi (high) ~240dpi xhdpi (extra-high) ~320dpi xxhdpi (extra-extra-high) ~480dpi xxxhdpi (extra-extra-extra-high) ~640dpi

basically system tries find best match drawables. when had them in ldpi folder, well, choice - took them , scaled them xhdpi/ldpi = 320/120. when added same images in hdpi folder, became best match, scaled xhdpi/hdpi = 320/240, hence smaller size.

generally, if find size images , want consistent size across different densities, need keep ratio between them.

traditionally, mdpi considered standard, ratio of 1:1, , rest follows:

ldpi =    1 : 0.75 mdpi =    1 : 1 hdpi =    1 : 1.5 xhdpi =   1 : 2 xxhdpi =  1 : 3 xxxhdpi = 1 : 4

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