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Android applications have an automatically generated file called "R.java". Please explain its purpose.
E.g.
Duplicate: What is the concept behind R.java?
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Android R. java is an auto-generated file by aapt (Android Asset Packaging Tool) that contains resource IDs for all the resources of res/ directory. If you create any component in the activity_main. xml file, id for the corresponding component is automatically created in this file.
R class is generated by Android tools from your resources before compiling your code. It contains assigned numeric constant for each resource that you can refer in your project. For example, you have XML resource file that contains about_button .
R is the class that contains all the resource ids for your application.
R. java is the generated file by ADT or Android studio. It will be located under app\build\generated\source\r directory.
Every application uses resources such as strings, drawbles, layouts, and styles. Instead of hard coding such resources into an application, one externalizes them and refers to them by ID. The R.java file contains all those resource IDs, whether assigned by the programmer or generated by the sdk.
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