java - cannot resolve symbol R, setContentView() android studio -

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i have found numerous posts issue , read through them. have tried rebuilding project, project clean , gradle-clean still didn't help.

perhaps there's wrong codes?

the error lies in "setcontentview(r.layout.read_comments)" cannot resolve symbol r

here code:

package com.example.mysqltest;  import android.app.activity; import android.os.bundle;  public class readcomments extends activity{      @override     protected void oncreate(bundle savedinstancestate) {         // todo auto-generated method stub         super.oncreate(savedinstancestate);         setcontentview(r.layout.read_comments);     } }

this error happened if there error in 1 of xml layout files. in case, project failed generate r file. check other errors appears know error , in xml layout file caused this. if project working before , not working now, check project history know modification caused error.


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