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Again and again I have the case that during development, the Android SDK suddenly doesn't regenerate the "R" file. Usually this is due to some error in one of the many .xml files, but that darn thing doesn't give the slighted indication, as to WHY it suddenly refuses to regenerate that file.
There is no error or warning listed for any of my .xml files and manually checking all those (meanwhile almost hundred!) XML files for errors is no real fun, either!
Is there some option or log or something that would allow to locate the problem quicker and more direct? Last time I had to do a lengthy binary search (i.e. copying and removing files to/from a second test project) trying to locate the offending file. That's really a nightmare and not how it should be in any decent SDK that deserves that name!
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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.
Resources are the additional files and static content that your code uses, such as bitmaps, layout definitions, user interface strings, animation instructions, and more.
Most often “R cannot be resolved” error appears if there is an issue with some of your resource files. Due to this error, you are unable to build your application. That's why we need to solve this error as it not getting away by just doing a simple restart or hitting Alt+Enter.
The resources locates inside res directory of your app. The Android resource compiler processes resources arcording to which subforder they are in and the format of the file, for example: res/drawable : Contains all resources file that can be drawable, such as (. png, .
sometimes this could happen if "invalid" file found under res folder or its subfolders. do you see any error message in console window?
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