The problem "Cannot resolve symbol R" may have appeared frequently while you were developing android projects. The R is red when you initially create a new activity or class, and Android Studio informs you that it cannot identify the sign R. To import the necessary files that are missing, simply hover over the R symbol and click Alt + Enter. But doing so does not correct this mistake. The resource is represented by the letter R. The build process' inability to sync Resource files with your projects is the cause of this problem. This typically occurs as a result of the project's faulty construction.
When you move your code to another computer or email the code to another user, you frequently get the problem "Cannot resolve symbol R" in Android Studio. When an application cannot be run, the "R" becomes red and throws an error. The "R cannot be resolved" error most frequently occurs when one or more of your resource files are problematic. You are unable to create your application because of this issue. We must therefore find a solution to this problem because a simple restart or pressing Alt+Enter won't make it go away.
To solve this problem, the easiest way is to Gradle Sync by clicking on File > Sync project with Gradle Files.
After this you can clean and rebuild the project and the error is gone. !!!
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