android - In my view something unwanted shows up -

i building snake game app.
fur works, except shows.
reason shows 2 snakes: original snake moves , can controlled, , begginging of snake doesn't anything.

before drew @ every cycle in loop background color, cover last canvas, , there no problem.

then decided divide snake background, have made snake canvas's background transparent , clear canvas each time wants draw new canvas (each loop-to move snake).

here code:

the run of thread:

public void run() {     long steppersecond=1000/fps;     long starttime;     long sleeptime;     while(isrunning){         canvas c=null;         starttime=system.currenttimemillis();          try{             c=this.getholder().lockcanvas();             synchronized (this.getholder()) {                 this.ondraw(c);                 }         }         catch(exception e){         }         finally{             if(c!=null){                 this.getholder().unlockcanvasandpost(c);             }          }         sleeptime= steppersecond-(system.currenttimemillis()-starttime);         if(sleeptime>0)             try {                 thread.sleep(sleeptime);             } catch (interruptedexception e) {                 // todo auto-generated catch block                 e.printstacktrace();             }     }  } 

the snake's ondraw (it uses snake's class on draw):

public void ondraw(canvas canvas) {     // todo auto-generated method stub     super.ondraw(canvas);     canvas.drawcolor(color.transparent, mode.clear);     snake.ondraw(canvas); } 

the snake's class ondraw:

public void ondraw(canvas canvas){     switch(dirtransfare(dir)){     case 1://right         xloc=xloc+part_size;     break;     case 2://up         yloc=yloc-part_size;     break;     case -1://left         xloc=xloc-part_size;     break;     case -2://down         yloc=yloc+part_size;     break;     }//swich     int x=xloc;     int y=yloc;         for(brick bp:snakebody){             bp.setr(0+x, 0+y, part_size+x, part_size+y);             canvas.drawrect(bp.getr(),bp.getp());             int xtemp=bp.getx();             int ytemp=bp.gety();             bp.setx(x);             bp.sety(y);             x=xtemp;             y=ytemp;         }//for each  }//ondraw 

here mainactivity, summons snakevew , backgorundview (snake game view , background arena)

public class mainactivity extends activity  { gameview gv; imageview left; imageview right; imageview up; imageview down; arena a;   @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);      /*requestwindowfeature(window.feature_no_title);     v= new gameview1(this);     setcontentview(v);     */     gv= new gameview(this);     a=new arena(this);     setcontentview(r.layout.game_view);     linearlayout surface = new linearlayout(this);     linearlayout background = new linearlayout(this);     surface = (linearlayout)findviewbyid(r.id.surface);     background = (linearlayout)findviewbyid(r.id.background);     surface.addview(gv);     background.addview(a);      left=(imageview) findviewbyid(r.id.left);     right=(imageview) findviewbyid(r.id.right);     up=(imageview) findviewbyid(r.id.up);     down=(imageview) findviewbyid(r.id.down);      left.setonclicklistener(new view.onclicklistener() {          @override         public void onclick(view v) {             // todo auto-generated method stub             if(gv.snake.getdir()!="left"&&gv.snake.getdir()!="right"){             gv.snake.left();             }         }     });     right.setonclicklistener(new view.onclicklistener() {          @override         public void onclick(view v) {             // todo auto-generated method stub             if(gv.snake.getdir()!="right"&&gv.snake.getdir()!="left"){             gv.snake.right();                }         }     });     up.setonclicklistener(new view.onclicklistener() {          @override         public void onclick(view v) {             // todo auto-generated method stub             if(gv.snake.getdir()!="up"&&gv.snake.getdir()!="down"){             gv.snake.up();               }         }     });     down.setonclicklistener(new view.onclicklistener() {          @override         public void onclick(view v) {             // todo auto-generated method stub             if(gv.snake.getdir()!="down"&&gv.snake.getdir()!="up"){             gv.snake.down();             }         }     });    } 

the problem not in background (the arena class); have alredy took down , confirmed (it worked same away, bug, without using arena class).

here how looks bug:

http://i.tinyuploads.com/q7oztz.jpg

(you can see 2 snakes - long 1 real one) blue background class arena.

any ideas? tnx :d