This is using the R class that the Android SDK generates for us to represent resources, such as the arrays.xml file.

这是使用 Android SDK 生成的 R 类表示资源，例如 arrays.xml 文件。

youdao

In most cases--including John Hancock--here's what the R class means: The firm each year will take 50 basis points---one-half of 1%--in expenses off the assets under management in the form of a so-called 12b(1) charge, authorized for marketing expenses.

FORBES: Magazine Article

Sales of the R-Class have been sluggish ever since its introduction for the 2006 model year.

FORBES: 2012 Mercedes-Benz R350 Bluetec 4Matic

Besides the usual hatchback, sedan and SUV, car shoppers today can consider yet-to-be-categorized cars such as the Mazda5, a micro-minivan, or Mercedes-Benz's R-Class, a maxi-station wagon.

CNN: Car shopping 2006: The inside track