"cannot resolve symbol R" in Android Studio

"cannot resolve symbol R" in Android Studio

android android-studio r.java-file

android

Developing for Android in Eclipse: R.java not regenerating

android eclipse r.java-file

android

Eclipse giving error, missing R.java file after recent update

android eclipse eclipse-plugin r.java-file eclipse-adt

android

How do I add selectableItemBackground to an ImageButton programmatically?

android attr r.java-file

android

Renaming the package that R.java is generated in

java android eclipse r.java-file

android

No generated R.java file in my project [duplicate]

android eclipse adt generated-code r.java-file

android

How to play the audio files directly from res/raw folder?

android media-player r.java-file

android

What is the concept behind R.java?

android architecture android-resources r.java-file

android

Error: Unable to open class file R.java [duplicate]

java android eclipse r.java-file

android

Android compiled resources - resources.arsc

android resources r.java-file

android

In Android applications what is the role of "R.java"? [closed]

android r.java-file

android

Android ADT version 22, R.java files not generated

android eclipse eclipse-plugin adt r.java-file

android

error: androidmanifest.xml file missing --> What am i missing?

java android r.java-file

android

Magic behind R.java file

android eclipse eclipse-plugin r.java-file

android

Android, string resource not found

android string resources r.java-file

android