如何调用android内置图片，比如menu->add的加号图片，search的放大镜图片
可以在android源代码里找? \frameworks\base\core\res\res\drawable\
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http://developer.android.com/guide/practices/ui_guidelines/icon_design.html
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Shown below are standard menu icons that are included in the Android platform (as of Android 1.5). You can reference any of these icon resources from your application as needed, but make sure that the action you assign to the icon is consistent with that listed. Note that this is not a complete list of icons and that the actual appearance of standard icons may change across platform versions.
To reference one of the icons from your code, use?android.R.drawable.<icon_resource_identifier>. For example, you can call a menu item's?setIcon()?method and pass the resource name:
.setIcon(android.R.drawable.ic_menu_more);.
You could reference the same icon from a layout file using?android:icon="@android:drawable/ic_menu_more">.
To determine the resource ID for an icon listed below, hover over the icon or simply look at image filenames, which use the format "<icon_resource_identifier>.png".
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