Android Canvas update line coords -

i have drawn line starting @ point (always zero) , ending @ point b using canvas.drawline(xstart, ystart, xend, yend);

but point b draggable, want update canvas line xend , yend b position when dragged. problems when update line coords thorows error 1 line explanation:

"fatal signal 11 (sigsegv), code 1, fault addr 0x10c in tid 5638 (xample.launcher)" says xample.launcher packagename com.example.launcher, don't know if problem there

here goes code.

drawview (point b)

import android.app.activity; import android.view.view;  public class drawview {  string label; int color, direction, x, y; view view; drawpath path;  public drawview(){  }  public drawview(string label, int color, int direction, int x, int y, view view){     this.label = label;     this.color = color;     this.direction = direction;     this.x = x;     this.y = y;     this.view = view; }  public string getlabel() {     return label; }  public void setlabel(string label) {     this.label = label; }  public int getcolor() {     return color; }  public void setcolor(int color) {     this.color = color; }  public int getdirection() {     return direction; }  public void setdirection(int direction) {     this.direction = direction; }  public int getx() {     return x; }  public void setx(int x) {     this.x = x; }  public int gety() {     return y; }  public void sety(int y) {     this.y = y; } public view getview() {     return view; } public void setview(view view) {     this.view = view; } public drawpath getpath() {     return path; } public void setpath(drawpath path) {     this.path = path; }    } 

drawpath (line between point point b)

    package com.example.launcher;  import android.content.context; import android.graphics.canvas; import android.graphics.paint; import android.util.log; import android.view.view;      public class drawpath extends view{      int color, x, y;     canvas canvas;     paint paint;      public drawpath(context context) {         super(context);         // todo auto-generated constructor stub     }      @override     protected void ondraw(canvas canvas) {         // todo auto-generated method stub         super.ondraw(canvas);         this.canvas = canvas;         paint = new paint();         paint.setcolor(color);         paint.setstrokewidth(10);          log.e("this x, y", this.x + " " + this.y);         canvas.drawline(0, 0, this.x, this.y, paint);         invalidate();     }       public void setcolor(int color){         this.color = color;     }      public int getcolor(){         return this.color;     }      public void setxvalue(int x){         this.x = x;         if(canvas != null){             canvas.drawline(0, 0, this.x, this.y, paint);             invalidate();         }     }      public float getxvalue(){         return this.x;     }      public void setyvalue(int y){         this.y = y;         if(canvas != null){             canvas.drawline(0, 0, this.x, this.y, paint);             invalidate();         }      }      public float getyvalue(){         return this.y;     }        } 

and ontouch event

@override     public boolean ontouch(view v, motionevent event) {         // todo auto-generated method stub          relativelayout.layoutparams params = (relativelayout.layoutparams)myview.getlayoutparams();         final int x = (int)event.getrawx();         final int y = (int)event.getrawy();           switch(event.getaction()){             case motionevent.action_down:                 xdelta = x - (draw.getx());                 ydelta = y - (draw.gety());                 break;             case motionevent.action_move:                     params.setmargins((x - xdelta), (y - ydelta), 0, 0);                 draw.getpath().setxvalue((x - xdelta));                 draw.getpath().setyvalue((y - ydelta));                 myview.setlayoutparams(params);                    break;             }          return true;     }