What is the main cause for a reference error?

Question

i am trying to run my program but facing an error problem.it is indicating an error sign under the R of my reference statement. what are the facts that can create this kind of errors ?

Please share with us your code, and where the error occurred. — , Dec 07 '13 at 19:13

score 1 · Accepted Answer · edited May 23 '17 at 11:49

R is an auto generate file.Problems occur if it does not generate or you did not reference to it correctly:

It may be caused if a file name in your /res folder be invalid;so R does not generate.
It may raised if you try to reference to R in a package that is not main package.
In your imports of your class,you may see import android.R; change it to import your.package.name.R;
It may be caused by an error in your resources.For example an error in XML layout or strings file.
You can do closing and reopening your project or going to >Project > Build all (and selecting "Build Automatically").It may be fix the problem.

It is recommended to see R cannot be resolved - Android error.

yeah i have made some mistakes inside the string.xml file.thank you :) — MS Tabrez, Dec 08 '13 at 06:09

What is the main cause for a reference error?

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