The syntax to refer to another resource in the XML file is
"@[package:]type/name"
Where :
package
The package is optional and is not required when access the resources in your owner package.
The package we often used is android.
type
color #color resources; saved in res/color
drawable #bitmap, png graphics and frame animation ; saved in res/drawable
layout #layout ; saved in res/layout
menu #contents of your menus; saved in res/menu
string #string, stri...
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