java - Android Studio - Error cannot find symbol class R while compiling OpenCV -


i'm trying compile project opencv keep getting problem: error:(5, 18) error: cannot find symbol class r

the error occurring in this: import org.opencv.r;

this part of code i'm getting error:

package br.raphael.extended; import java.util.list; import org.opencv.r; import org.opencv.android.utils; import org.opencv.core.mat; import org.opencv.core.size; import org.opencv.highgui.highgui;  import br.raphael.detector.fpsmeterextended; import android.app.activity; import android.app.alertdialog; import android.content.context; import android.content.dialoginterface; import android.content.res.typedarray; import android.graphics.bitmap; import android.graphics.canvas; import android.util.attributeset; import android.util.log; import android.view.surfaceholder; import android.view.surfaceview;  /**  * basic class, implementing interaction camera , opencv library.  * main responsibility of - control when camera can enabled, process frame,  * call external listener make adjustments frame , draw resulting  * frame screen.  * clients shall implement cvcameraviewlistener.  */ public abstract class camerabridgeviewbaseextended extends surfaceview implements surfaceholder.callback {      private static final string tag = "camerabridge";     private static final int max_unspecified = -1;     private static final int stopped = 0;     private static final int started = 1;      private int mstate = stopped;     private bitmap mcachebitmap;     private cvcameraviewlistener2 mlistener;     private boolean msurfaceexist;     private object msyncobject = new object();      protected int mframewidth;     protected int mframeheight;     protected int mmaxheight;     protected int mmaxwidth;     protected int mpreviewformat = highgui.cv_cap_android_color_frame_rgba;     protected int mcameraindex = -1;     protected boolean menabled;     protected fpsmeterextended mfpsmeter = null;      public camerabridgeviewbaseextended(context context, int cameraid) {         super(context);         mcameraindex = cameraid;     }      public camerabridgeviewbaseextended(context context, attributeset attrs) {         super(context, attrs);          int count = attrs.getattributecount();         log.d(tag, "attr count: " + integer.valueof(count));          typedarray styledattrs = getcontext().obtainstyledattributes(attrs, r.styleable.camerabridgeviewbase);         if (styledattrs.getboolean(r.styleable.camerabridgeviewbase_show_fps, false))             enablefpsmeter();          mcameraindex = styledattrs.getint(r.styleable.camerabridgeviewbase_camera_id, -1);          getholder().addcallback(this);         mmaxwidth = max_unspecified;         mmaxheight = max_unspecified;     }

if getting error mentioning import org.opencv.r , means there error in of xml view page. recheck xml page


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