android - R.java has been generated, still getting 'cannot be resolved to be a variable' -

i'm thinking might have packages, can't find error. there no errors(red marks) in xml files, , drawables , xml files conform naming convention. have tried cleaning project, , there no import r.java anywhere.

the classes cannot find r.java is:

  com.datafetcher.main.menu.java   com.datafetcher.showperson.mainactivity.java   com.datafetcher.showperson.displaymessageactivity.java 

in android manifest have declared:

 <manifest xmlns:android="http://schemas.android.com/apk/res/android"   package="com.datafetcher"   ... 

and activities declared:

<activity         android:name=".main.menu"         android:label="@string/title_activity_display_message">           <intent-filter>             <action android:name="android.intent.action.main" />              <category android:name="android.intent.category.launcher" />         </intent-filter>      </activity>      <activity         android:name=".showperson.mainactivity"         android:label="@string/app_name"          android:parentactivityname="com.datafetcher.main.menu" >       </activity>      <activity         android:name=".showperson.displaymessageactivity"         android:label="@string/title_activity_display_message"         android:parentactivityname="com.datafetcher.main.menu" >      </activity> 

my r.java generated gen/com.datafetcher.r.java. why can't use in code?

this nice 5 second edit. supposed import com.datafetcher.r? tried reason, , works. have never done before, assumed done implicitly somehow.

sometimes happens when import r different package. example, copy text 1 project in eclipse, com.example.foo package, , eclipse inserts import directive package's r. generated r belongs package. in case have delete bad import.

by way, see all resource ids not found or of them? (in same file, in different files?)

one more possibility application package , activity package different. in case need , explicit import statement.

in case, classes com.datafetcher.r , com.datafetcher.main.menu belong different packages, namely, com.datafetcher , com.datafetcher.main. in java, classes see other classes in same package without explicit importing, classes in different packages visible after import them.