You can use the system icons using the @android: prefix. The icon is not copied to the drop-down folders, so the application size is smaller
Example: android:icon="@android:drawable/ic_menu_preferences"
List of icons on / platform / android - / data / res / drawable-hdpi
Note 1: If you want to copy the icons to the drop-down files, you can also do this in eclipse using the file / new / other / Anddoid set set / clip button / select button.
Note 2: the icon set may vary among platforms. That is why people offer to copy resources. If the application is under development, you can simply link the platform icons
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