Android Basic Syntax

Knowing the meaning of each folder in the Res directory, let's take a look at how to use these resources. Like the Hello world! string we just found in Strings.xml, we have two ways to refer to it:
1. A reference to the string can be obtained by R.string.hello_world in the code;
2. A reference to the string can be obtained through @string/hello_world in the XML.
The basic syntax is the above two ways, where the string part can be replaced, if the reference picture resources can be replaced with drawable, if the referenced layout file can be replaced layout, and so on.

Android Basic Syntax