Icon dialog android phone system, there are ways to use it?

For example, when prompted to delete, there is a exclamation mark icon, and then prompted to delete text messages.
Write your own dialog, can add this exclamation system? Or must own png file into the res folder?

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Reply:
You want to use this?
android.R.drawable.ic_dialog_alert
Reply:
android-sdk \ platforms \ android-XX \ data \ there is something you want under the res