Android custom UI particle effect

public class Ball {

  public int color;//color  public float x;//Center x coordinate  public float y;//Center y coordinate  public float r;//Particle Radius
  public float vX;//Horizontal velocity of particles  public float vY;//Particle y-direction velocity  public float aX;//The horizontal acceleration of the particle  public float ay;//The acceleration of the particle y direction}

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public class SplitView extends View {

  private Paint mPaint;
  private Bitmap mBitmap;
  private float d=3;//Particle diameter  private ValueAnimator mAnimator;
  private List<Ball> mBalls=new ArrayList<>();
  public SplitView(Context context) {
    super(context);
  }

  public SplitView(Context context, @Nullable AttributeSet attrs) {
    super(context, attrs);
  }

  public SplitView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
    init();
  }

  private void init() {
    mPaint=new Paint();
    mBitmap= (getResources(),.ic_launcher_background);
    for (int i=0;i<();i++){
      for (int j =0;j<();j++){
        Ball ball=new Ball();
        =(i,j);
        =i*d+d/2;
        =j*d+d/2;
        =d/2;

        //Speed ​​(-20, 20)        =(float)((-1,(()*1000))*20*());
        =rangInt(-15,35);

        =0;
        =0.98f;
        (ball);
      }
    }
    mAnimator=(0,1);
    (-1);//Unlimited repetitions    (2000);//Repeat time    (new LinearInterpolator());
    (new () {
      @Override
      public void onAnimationUpdate(ValueAnimator animation) {
        upDateBall();
        invalidate();//Recall the onMeasure, ondraw method.      }
    });
  }

  private int rangInt(int x,int y){
    int max=(x,y);
    int min=(x,y);
    return (int)(min+(()*(max-min)));
  }

  private void upDateBall() {
    for (Ball ball:mBalls){
      =+;
      =+;
      +=;
      +=;

    }

  }

  @Override
  protected void onDraw(Canvas canvas) {
    (canvas);
    (500,500);
    for (Ball ball:mBalls){
      ();
      (,,,mPaint);
    }
  }

  @Override
  public boolean onTouchEvent(MotionEvent event) {
   if (()==MotionEvent.ACTION_DOWN)
   {

     //Trigger animation     ();
   }
    return (event);
  }
}