如果你想让你的应用程序在大量设备上可用，你应该把你的应用程序图标放在提供的res/drawable...个不同文件夹中.在每个文件夹中，您都应该包含一个48dp大小的图标:
drawable-ldpi (120 dpi, Low density screen)-36px x 36pxdrawable-mdpi (160 dpi, Medium density screen)-48px x 48pxdrawable-hdpi (240 dpi, High density screen)-72px x 72pxdrawable-xhdpi (320 dpi, Extra-high density screen)-96px x 96pxdrawable-xxhdpi (480 dpi, Extra-extra-high density screen)-144px x 144pxdrawable-xxxhdpi (640 dpi, Extra-extra-extra-high density screen)-192px x 192px然后，您可以在AndroidManifest.xml文件中定义图标，如下所示:
<application android:icon="@drawable/icon_name" android:label="@string/app_name" >
....
</application>