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The automatic generation of the R class does not work anymore. I have tried Project -> Clean... A warning on all xml files has also showed up: “No grammar constraints (DTD or XML schema) detected for the document.” Maybe that is why the code generation have stoped. Any idea how to get the R class generated again?
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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 .
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 holds reference for all your android resources.. without which you cannot access any resources (drawable, layout, xmls etc) And R. class is Autogenerated. Follow this answer to receive notifications.
Close your app in an Android Studio/Eclipse . Go to your workspace where you have the project. Open that R. jave file in notepad and remove the "/" symbol then save it.
The R file will not be generated unless there are not error in the /res/ folder.
If there are not errors in the /res/ folder, try removing the gen folder and then right click on the project -> android -> fix android settings.
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