使用Android自带的图标
使用方法：android:icon="@android:drawable/ic_menu_save"
可用的资源如下：
Android系统中自带了很多图标，我们的程序可以方便使用。
Android™ 1.5 android.R.drawable Icon Resources
http://since2006.com/android/1.5-drawables.php
Android™ 1.6 android.R.drawable Icon Resources
http://since2006.com/android/1.6-drawables.php
Android™ 2.1 android.R.drawable Icon Resources
http://since2006.com/android/2.1-drawables.php
alert_dark_frame
alert_light_frame
arrow_down_float
arrow_up_float
bottom_bar
btn_default
btn_default_small
btn_dialog
btn_dropdown
btn_minus
btn_plus
btn_radio
btn_star
btn_star_big_off
btn_star_big_on
button_onoff_indicator_off
button_onoff_indicator_on
checkbox_off_background
checkbox_on_background
dark_header
dialog_frame
divider_horizontal_bright
divider_horizontal_dark
divider_horizontal_dim_dark
divider_horizontal_textfield
edit_text
editbox_background
editbox_background_normal
editbox_dropdown_dark_frame
editbox_dropdown_light_frame
gallery_thumb
ic_btn_speak_now
ic_delete
ic_dialog_alert
ic_dialog_dialer
ic_dialog_email
ic_dialog_info
ic_dialog_map
ic_input_add
ic_input_delete
ic_input_get
ic_lock_idle_alarm
ic_lock_idle_charging
ic_lock_idle_lock
ic_lock_idle_low_battery
ic_lock_lock
ic_lock_power_off
ic_lock_silent_mode
ic_lock_silent_mode_off
ic_media_ff
ic_media_next
ic_media_pause
ic_media_play
ic_media_previous
ic_media_rew
ic_menu_add
ic_menu_agenda
ic_menu_always_landscape_portrait
ic_menu_call
ic_menu_camera
ic_menu_close_clear_cancel
ic_menu_compass
ic_menu_crop
ic_menu_day
ic_menu_delete
ic_menu_directions
ic_menu_edit
ic_menu_gallery
ic_menu_help
ic_menu_info_details
ic_menu_manage
ic_menu_mapmode
ic_menu_month
ic_menu_more
ic_menu_my_calendar
ic_menu_mylocation
ic_menu_myplaces
ic_menu_preferences
ic_menu_recent_history
ic_menu_report_image
ic_menu_revert
ic_menu_rotate
ic_menu_save
ic_menu_search
ic_menu_send
ic_menu_set_as
ic_menu_share
ic_menu_slideshow
ic_menu_sort_alphabetically
ic_menu_sort_by_size
ic_menu_today
ic_menu_upload
ic_menu_upload_you_tube
ic_menu_view
ic_menu_week
ic_menu_zoom
ic_notification_clear_all
ic_notification_overlay
ic_partial_secure
ic_popup_disk_full
ic_popup_reminder
ic_popup_sync
ic_search_category_default
ic_secure
menu_frame
menu_full_frame
picture_frame
presence_away
presence_busy
presence_invisible
presence_offline
presence_online
progress_indeterminate_horizontal
radiobutton_off_background
radiobutton_on_background
spinner_background
spinner_dropdown_background
star_big_off
star_big_on
star_off
star_on
stat_notify_call_mute
stat_notify_chat
stat_notify_error
stat_notify_missed_call
stat_notify_more
stat_notify_sdcard
stat_notify_sdcard_prepare
stat_notify_sdcard_usb
stat_notify_sync
stat_notify_sync_noanim
stat_notify_voicemail
stat_sys_data_bluetooth
stat_sys_download
stat_sys_download_done
stat_sys_headset
stat_sys_phone_call
stat_sys_phone_call_forward
stat_sys_phone_call_on_hold
stat_sys_speakerphone
stat_sys_upload
stat_sys_upload_done
stat_sys_vp_phone_call
stat_sys_vp_phone_call_on_hold
stat_sys_warning
status_bar_item_app_background
status_bar_item_background
sym_action_call
sym_action_chat
sym_action_email
sym_call_incoming
sym_call_missed
sym_call_outgoing
sym_contact_card
sym_def_app_icon
title_bar
title_bar_tall
toast_frame
zoom_plate
http://www.eoeandroid.com/thread-35650-1-1.html
