Android R cannot be resolved to variable

Question

I just had a working app turn into a broken one. When I call any findViewById, the app cannot browse R properly and says R cannot be resovled to variable. So none of my drawables and code can be read. It says to import R but then it gets even further into the rabbit hole of fustration.

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
 }

edit: I had an error within my strings.xml. IT now works. Thanks to the helpful comments.

Are you using Eclipse or Android Studio? What package is your activity class in? What is the package for your project? — Code-Apprentice, Jul 25 '14 at 22:59
Have you ever visited Microsoft's support forums? First answer is always the same: "Have you tried turning it off and on again"? Same here, what happens when you clean project? Check your layout files, maybe you added a comment, which breaks xml? — Marius, Jul 25 '14 at 23:03
Im using Eclipse ADT. My package is in com.jakegosskuehn.couchto5k. — Jayizzle, Jul 25 '14 at 23:04
possible duplicate of [R cannot be resolved - Android error](http://stackoverflow.com/questions/885009/r-cannot-be-resolved-android-error) — ben75, Jul 25 '14 at 23:05

score 1 · Answer 1 · answered Jul 25 '14 at 23:13

1

You should fix any syntax errors in your main layout first.

answered Jul 25 '14 at 23:13

user3219446

117
1
11

score 1 · Accepted Answer · answered Jul 25 '14 at 23:15

Most probable cause is an error in one of your layouts. If the resource compiler can't compile the resources, it doesn't generate the file defining R, so suddenly R becomes unresolvable.

Look through your layouts for something wrong. It will probably be the change you made just before it all went wrong.

Android R cannot be resolved to variable

2 Answers2