What is R class in android [duplicate]

Question

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Closed 13 years ago.

Possible Duplicate:
Understand the R class in Android

I cant understand why use 'R' Class in android application.

 setContentView(R.layout.main);

Can explain why use R used here.

• Seshu Vinay: There are n number of similar questions
• Callat: As a noob android developer I started searching the same thing and wound up here. Very helpful question and tagging

Answer 1

Your question is duplicate of Understand the R class in Android

When your application is compiled, aapt generates the R class, which contains resource IDs for all the resources in your res/ directory. For each type of resource, there is an R subclass (for example, R.drawable for all drawable resources) and for each resource of that type, there is a static integer (for example, R.drawable.icon). This integer is the resource ID that you can use to retrieve your resource.

I got this detail from the below link ,check this once for more details : http://developer.android.com/guide/topics/resources/accessing-resources.html

Answer 2

R.java which is Automatically System generated file it contains the id of each resources used in Application which is used to make refrence.

Answer 3

R.class contains IDs for all your android resources.

Answer 4

R.class holds reference for all your android resources.. without which you cannot access any resources (drawable, layout, xmls etc) And R.class is Autogenerated.

Answer 5

R is the class that contains all the resource ids for your application.

Answer 6

Its a resource class, contains ID for for all resources. Here you can also use

 setContentView(main);

Answer 7

You can find more info here: http://developer.android.com/reference/android/R.html