android - Communicating between fragments - accessing class inside fragment? -

i attempting communicate between 2 fragments in android program. i've been following guide communicating other fragments , going far. have 1 fragment sending data host activity, , activity correctly acknowledges data through log statements. have referenced second fragment within activity, , set send information fragment, therein lies problem; method in second fragment, need call host activity, inside of class inside of fragment, , what's more, method relies on data defined inside of fragment. i've tried call method directly, cannot seem it. there way of getting past these limitations?

host activity:

package com.example.chris.drawingtest;  import android.app.activity; import android.os.bundle; import android.util.log;   public class drawingactivity extends activity     implements toolbarfragment.toolselectionlistener {      public void sendnewvalue(int newvalue) {         log.d("data received toolbar fragment: ", "the id of button pressed " + newvalue);         drawingfragment drawfrag = (drawingfragment)getfragmentmanager().findfragmentbyid(r.id.drawing);          if (drawfrag != null) {             //changetool (part of drawview) want call method         }     }      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_drawing);     }  } 

fragment code:

package com.example.chris.drawingtest;  import android.app.activity; import android.app.fragment; import android.content.context; import android.graphics.bitmap; import android.graphics.canvas; import android.graphics.paint; import android.graphics.path; import android.graphics.point; import android.os.bundle; import android.util.attributeset; import android.util.log; import android.view.display; import android.view.layoutinflater; import android.view.motionevent; import android.view.view; import android.view.viewgroup; import android.view.windowmanager; import android.widget.imagebutton; import android.widget.linearlayout;  import com.example.chris.drawingtest.r;  import java.text.attributedcharacteriterator;  /**  * created chris on 11/28/2014.  */ public class drawingfragment extends fragment {      @override     public view oncreateview(layoutinflater inflater, viewgroup container, bundle savedinstancestate) {         log.d("oncreateview: ","this ran successfully");         view v = inflater.inflate(r.layout.fragment_drawing, container, false);         drawview drawview = new drawview(v.getcontext());         return v;     }      public static class drawview extends view {          private path drawpath = new path();         private paint drawpaint = new paint();         private paint canvaspaint;         private canvas drawcanvas;         private bitmap canvasbitmap;          private int paintcolor = 0xff000000;    //opaque black pencil         private int canvascolor = 0xffffffff;   //pure white canvas          public drawview(context context) {             super(context);              log.d("drawview: ", "method called");              drawpaint.setcolor(paintcolor);              drawpaint.setstrokewidth(5);             drawpaint.setstyle(paint.style.stroke);             drawpaint.setstrokejoin(paint.join.round);             drawpaint.setstrokecap(paint.cap.round);              canvaspaint = new paint(paint.dither_flag);              point p = getscreensize(context);             int w = p.x;             int h = p.y;              onsizechanged(w,h,0,0);          }          public drawview(context context, attributeset attrs) {             super(context);              log.d("drawview: ", "method called");              drawpaint.setcolor(paintcolor);              drawpaint.setstrokewidth(20);             drawpaint.setstyle(paint.style.stroke);             drawpaint.setstrokejoin(paint.join.round);             drawpaint.setstrokecap(paint.cap.round);              canvaspaint = new paint(paint.dither_flag);              point p = getscreensize(context);             int w = p.x;             int h = p.y;              onsizechanged(w,h,0,0);          }          public drawview(context context, attributeset attrs, int defstyle) {             super(context);              log.d("drawview: ", "method called");              drawpaint.setcolor(paintcolor);              drawpaint.setstrokewidth(10);             drawpaint.setstyle(paint.style.stroke);             drawpaint.setstrokejoin(paint.join.round);             drawpaint.setstrokecap(paint.cap.round);              canvaspaint = new paint(paint.dither_flag);              point p = getscreensize(context);             int w = p.x;             int h = p.y;              onsizechanged(w,h,0,0);          }  // ------------------------ method need call ----------------------          public boolean changetool(int toolcode){             switch(toolcode){                 case 0:                     drawpaint.setcolor(paintcolor);                     break;                 case 1:                     drawpaint.setcolor(canvascolor);                     break;                 default:                     return false;             }             return true;         }  // ------------------------ method need call ----------------------           protected point getscreensize(context context) {             windowmanager wm = (windowmanager) context.getsystemservice(context.window_service);             display display = wm.getdefaultdisplay();             point size = new point();             display.getsize(size);             return size;         }          protected void onsizechanged(int w, int h, int oldw, int oldh) {             super.onsizechanged(w,h,oldw,oldh);              log.d("onsizechanged: ", "method called");              canvasbitmap = bitmap.createbitmap(w,h,bitmap.config.argb_8888);             drawcanvas = new canvas(canvasbitmap);         }          @override         protected void ondraw(canvas canvas) {             super.ondraw(canvas);              log.d("ondraw: ", "method called");              canvas.drawbitmap(canvasbitmap,0,0,canvaspaint);             canvas.drawpath(drawpath, drawpaint);         }          @override         public boolean ontouchevent(motionevent event) {             float touchx = event.getx();             float touchy = event.gety();              log.d("ontouchevent: ", "method called");              switch(event.getaction()) {                 case motionevent.action_down:                     drawpath.moveto(touchx,touchy);                     break;                 case motionevent.action_move:                     drawpath.lineto(touchx,touchy);                     break;                 case motionevent.action_up:                     drawcanvas.drawpath(drawpath, drawpaint);                     drawpath.reset();                     break;                 default:                     return false;             }             invalidate();             return true;         }     } } 

thanks can give!

you'll need have method in fragment call activity, , fragment method can pass on view.

public class drawingfragment extends fragment {      drawview drawview;      @override     public view oncreateview(layoutinflater inflater, viewgroup container, bundle savedinstancestate) {         log.d("oncreateview: ","this ran successfully");         view v = inflater.inflate(r.layout.fragment_drawing, container, false);         drawview = new drawview(v.getcontext());         return v;     }      public boolean changetool(int toolcode){         if (drawview != null) {             drawview.changetool(toolcode);         }     } 

if have lot of such methods want call, , gets tedious write of these functions, consider moving of drawview fields drawingfragment, , drawingfragment actual work, while drawview referred fragment's fields needed.