android - How call onDraw method from another method to draw dynamically? -

i want redraw view method (say setprogress) in class extending view. how can this.

my view class is

public class spinview extends view {     private paint paint;     private context context;     private canvas canvas;     private rectf arcoval;      public spinview(context context) {         super(context);         this.context = context;      }     public spinview(context context, attributeset attrs) {         super(context, attrs, 0);         this.context = context;     }      public spinview(context context, attributeset attrs, int defstyle) {         super(context, attrs, defstyle);         this.context = context;     }       @override     protected void ondraw(canvas canvas) {         super.ondraw(canvas);         this.canvas = canvas;         display d = ((windowmanager)context.getsystemservice(context.window_service)).getdefaultdisplay();         int width = d.getwidth();         int height = d.getheight();         arcoval = new rectf((width/2-50), (height/2-50), (width/2+50), (height/2+50)); //      rectf arcoval = new rectf(200, 200, 300, 300);         paint = new paint();         paint.setcolor(color.blue);         paint.setstrokewidth(10);         paint.setantialias(true);         paint.setstrokecap(paint.cap.round);         paint.setstyle(paint.style.stroke);          canvas.drawarc(arcoval, 270f, 360, false, paint);     }      protected void setprogress(float angle){         paint = new paint();         paint.setcolor(color.yellow);         paint.setstrokewidth(10);         paint.setantialias(true);         paint.setstrokecap(paint.cap.round);         paint.setstyle(paint.style.stroke);          canvas.drawarc(arcoval, 270f, angle, false, paint);     }  } 

all want draw circular arc of yellow color on created arc of blue color. help?