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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?
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.