Sprite auto-run

package com.MyGame;
import java.util.Random;

import android.graphics.Bitmap;
import android.graphics.Canvas;

public class Sprite {
 private Bitmap bitmap;
 private int x;
 private int y;
 float bitmap_halfWidth, bitmap_halfHeight;
 
 Random random = new Random();
 private int dirX;
 private int dirY;
 private int moveX;
 private int moveY;
 
 final int MAX = 99;
 
 public Sprite(Bitmap bm, int tx, int ty){
  bitmap = bm;
  x = tx;
  y = ty;
  bitmap_halfWidth = bitmap.getWidth()/2;
  bitmap_halfHeight = bitmap.getHeight()/2;

  if(random.nextBoolean()){
   dirX = 1;
  }else{
   dirX = -1;
  }
  
  if(random.nextBoolean()){
   dirY = 1;
  }else{
   dirY = -1;
  }
  
  moveX = random.nextInt(MAX) + 1;
  moveY = random.nextInt(MAX) + 1;
  
 }
 
 public void setX(int tx){
  x = tx;
 }
 
 public void setY(int ty){
  y = ty;
 }
 
 public int getX(){
  return x;
 }
 
 public int getY(){
  return y;
 }
 
 public void draw(Canvas canvas){
  
  if(x < 0){
   x = 0;
   dirX *= -1;
   moveX = random.nextInt(MAX) + 1;
  }else if(x >= canvas.getWidth()){
   x = canvas.getWidth();
   dirX *= -1;
   moveX = random.nextInt(MAX) + 1;
  }
  
  if(y < 0){
   y = 0;
   dirY *= -1;
   moveY = random.nextInt(MAX) + 1;
  }else if(y >= canvas.getHeight()){
   y = canvas.getHeight();
   dirY *= -1;
   moveY = random.nextInt(MAX) + 1;
  }
  
  
  canvas.drawBitmap(bitmap, x-bitmap_halfWidth, y-bitmap_halfHeight, null);
 }
 
 public void update(){
  x += (dirX * moveX);
  y += (dirY * moveY);
 }

}

package com.MyGame;

import android.content.Context;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.PorterDuff.Mode;
import android.util.AttributeSet;

public class MyForeground extends MyGameSurfaceView {
 
 Sprite mySprite;

 public MyForeground(Context context) {
  super(context);
  init();
 }

 public MyForeground(Context context, AttributeSet attrs) {
  super(context, attrs);
  init();
 }

 public MyForeground(Context context, AttributeSet attrs, int defStyle) {
  super(context, attrs, defStyle);
  init();
 }
 
 private void init(){
  mySprite = new Sprite(
    BitmapFactory.decodeResource(getResources(), R.drawable.icon_me),
    100, 100);
 }

 @Override
 protected void onDraw(Canvas canvas) {
  //Clear Canvas with transparent background
  canvas.drawColor(Color.TRANSPARENT, Mode.CLEAR);
  
  mySprite.draw(canvas);
 }

 @Override
 public void updateStates() {
  // TODO Auto-generated method stub
  mySprite.update();
 }

}