What is R class in android

Question

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.

As a noob android developer I started searching the same thing and wound up here. Very helpful question and tagging — Callat, Oct 31 '18 at 15:25

score 16 · Accepted Answer · edited May 23 '17 at 10:31

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

score 3 · Answer 2 · answered Feb 23 '12 at 07:15

3

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

answered Feb 23 '12 at 07:15

Ronak Mehta

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score 2 · Answer 3 · edited Feb 23 '12 at 07:08

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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.

edited Feb 23 '12 at 07:08

Parag Chauhan

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answered Feb 23 '12 at 07:04

ngesh

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score 2 · Answer 4 · answered Feb 23 '12 at 07:06

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R.class contains IDs for all your android resources.

answered Feb 23 '12 at 07:06

Igor Popov

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score 1 · Answer 5 · answered Feb 23 '12 at 07:08

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

answered Feb 23 '12 at 07:08

Philip Sheard

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score 1 · Answer 6 · edited Feb 23 '12 at 07:43

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

 setContentView(main);

edited Feb 23 '12 at 07:43

Andro Selva

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answered Feb 23 '12 at 07:09

Programmer

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score 0 · Answer 7 · answered Feb 23 '12 at 07:07

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

answered Feb 23 '12 at 07:07

PhatHV

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What is R class in android

7 Answers7