testing phase of Resizer

Resizer.java

import android.content.Context;
import android.content.res.Resources;
import android.os.Handler;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.view.WindowManager;

public class Resizer {

    public static int DONT_CHANGE = -999;

    private Handler handler = new Handler();
    private ViewGroup.LayoutParams layoutParams;
    private View view;
    private int[] widthSizes;
    private int[] heightSizes;

    private int resizeSpeed = 16;
    public Resizer(Context context){
        // getting the screen's refresh rate and setting size transition based on the speed
        // for smooth animation
        WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
        if (windowManager != null) {
            resizeSpeed = (int) (1000 / windowManager.getDefaultDisplay().getRefreshRate());
        }
    }

    public Resizer resizeView(View view, float widthDP, float heightDP, int duration){

        this.view = view;
        layoutParams = view.getLayoutParams();
        int viewWidth = view.getWidth();
        int viewHeight = view.getHeight();
        int width;
        int height;
        if (widthDP == DONT_CHANGE)
            width = viewWidth; // I WILL CHANGE THESE LATER - THIS IS TESTING PHASE
        else
            width = dpToPx(widthDP);
        if (heightDP == DONT_CHANGE)
            height = viewHeight;
        else
            height = dpToPx(heightDP);
        int stepCount = duration / resizeSpeed;

        widthSizes = getSizesArray(viewWidth, width, stepCount);
        heightSizes = getSizesArray(viewHeight, height, stepCount);

        handler.post(runnableResizeView);

        return this;
    }


    private int setSize = 0;
    private Runnable runnableResizeView = new Runnable() {
        @Override
        public void run() {
            if (setSize < widthSizes.length){
                layoutParams.width = widthSizes[setSize];
                layoutParams.height = heightSizes[setSize];
                view.setLayoutParams(layoutParams);
                Log.i("Size #" + setSize, widthSizes[setSize]+"");
                setSize++;
                handler.postDelayed(this, resizeSpeed);
            }
            else if (onResizerFinishListener != null)
                onResizerFinishListener.onFinish();
        }
    };



    private int[] getSizesArray(int startSize, int endSize, int stepCount) {
        int[] sizes = new int[stepCount + 1];

        float stepSize = (endSize - startSize) / (float) stepCount;

        // making array
        sizes[0] = startSize;
        for (int i = 1; i < stepCount; i++){
            sizes[i] = startSize + (int) (stepSize * i);
        }
        sizes[sizes.length-1] = endSize;

        return sizes;
    }

    



    private static int dpToPx(float dp) {
        return (int) (dp * Resources.getSystem().getDisplayMetrics().density);
    }

    OnResizerFinishListener onResizerFinishListener;
    public void setOnResizerFinishListener(OnResizerFinishListener l){
        onResizerFinishListener = l;
    }
}