If you intend on your application being available on a large range of devices, you should place your application icon into the different res/drawable...
folders provided. In each of these folders, you should include a 48dp sized icon:
drawable-ldpi
(120 dpi, Low density screen) - 36px x 36px
drawable-mdpi
(160 dpi, Medium density screen) - 48px x 48px
drawable-hdpi
(240 dpi, High density screen) - 72px x 72px
drawable-xhdpi
(320 dpi, Extra-high density screen) - 96px x 96px
drawable-xxhdpi
(480 dpi, Extra-extra-high density screen) - 144px x 144px
drawable-xxxhdpi
(640 dpi, Extra-extra-extra-high density screen) - 192px x 192px
You may then define the icon in your AndroidManifest.xml
file as such:
<application android:icon="@drawable/icon_name" android:label="@string/app_name" >
....
</application>
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