android - My Game has a memory leak -

i working on simple game. monitoring heap size , increasing max limit of 48mb. however, don't see in code cause such high memory usage. doing drawing 9 circles on screen , setting shadow around them. appreciated thanks!

 public void run() {     log.d("speed buttons", "background thread has started");     //standard game loop     canvas canvas;     while(isrunning == true)     {            if(!holder.getsurface().isvalid()) {             continue;         }          canvas = holder.lockcanvas();         //call dodraw method         dodraw(canvas);           holder.unlockcanvasandpost(canvas);      }   }   protected void dodraw(canvas canvas) {     paint circle = new paint();     circle.setcolor(color.blue);      //creates glow around circles     circle.setshadowlayer(5,0,0,color.red);      op.setwidthsetheight(getwidth(), getheight());     int big = 130;     op.setbig(130);       //i have use getwidth , getheight in draw, because in context, include title bar , status bar     //circle 5     //using convertdp pixel      canvas.drawcircle(getwidth()/2,getheight()/2,op.convertdptopixel(6000),circle);      //circle 2     canvas.drawcircle(getwidth()/2,getheight()/2-big*scale,op.convertdptopixel(6000),circle);     //circle 1     canvas.drawcircle(getwidth()/2-(big*scale),getheight()/2-big*scale,op.convertdptopixel(6000),circle);     //circle 3     canvas.drawcircle(getwidth()/2+ (big*scale),getheight()/2-big*scale,op.convertdptopixel(6000),circle);     //circle 8     canvas.drawcircle(getwidth()/2,getheight()/2+big*scale,op.convertdptopixel(6000),circle);     //circle 4     canvas.drawcircle(getwidth()/2-(big*scale),getheight()/2,op.convertdptopixel(6000),circle);     //circle 6     canvas.drawcircle(getwidth()/2+(big*scale),getheight()/2,op.convertdptopixel(6000),circle);     //circle 7     canvas.drawcircle(getwidth()/2-(big*scale),getheight() / 2 + big * scale, op.convertdptopixel(6000), circle);     //circle 9     canvas.drawcircle(getwidth()/2+(big*scale),getheight()/2+big*scale,op.convertdptopixel(6000),circle);           } 

it's possible calls drawcircle creating local variables in heap. garbage collector should take care of them, why it's capping off. having problems? or concern?