TranslateAnimation를 이용한 이동 에니메이션 구현하기

package com.example.denky.ageis;

import android.view.ViewGroup;
import android.view.animation.Animation;
import android.view.animation.TranslateAnimation;
import android.widget.LinearLayout;

import static com.example.denky.ageis.ReferenceString.ANIMATION_DONE;
import static com.example.denky.ageis.ReferenceString.MAIN_URL;
import static com.example.denky.ageis.ReferenceString.TIME_OF_ANIMATION;

/**
 * Created by denky on 2017-06-28.
 */

public class AnimateUniverseBar {
    public final int VISIBLE_ANIMATE = 1;
    public final int INVISIBLE_ANIMATE = 2;

    public void animate(LinearLayout bar, CustomizedWebView wv, int behaviour){
        switch (behaviour){
            case VISIBLE_ANIMATE :
                visibleUniverseBar(bar, wv);
                break;
            case INVISIBLE_ANIMATE :
                invisibleUniverseBar(bar, wv);
                break;
        }
    }

    private void visibleUniverseBar(LinearLayout bar, CustomizedWebView wv){
        ViewGroup.LayoutParams params = bar.getLayoutParams();
        params.height = LinearLayout.LayoutParams.WRAP_CONTENT;
        bar.setLayoutParams(params);
        wv.scrollTo(0,0);
    }

    private void invisibleUniverseBar(final LinearLayout bar, CustomizedWebView wv){
        if(ANIMATION_DONE == true && !wv.getUrl().equals(MAIN_URL) ) {
            TranslateAnimation ani = new TranslateAnimation(
                    Animation.RELATIVE_TO_SELF, 0.0f,
                    Animation.RELATIVE_TO_SELF, 0.0f,
                    Animation.RELATIVE_TO_SELF, 0.0f, //fromY
                    Animation.RELATIVE_TO_SELF, -1.0f);//toY

            ani.setAnimationListener(new Animation.AnimationListener() {
                @Override
                public void onAnimationStart(Animation animation) {

                    ANIMATION_DONE = false;
                }

                @Override
                public void onAnimationEnd(Animation animation) {

                    ViewGroup.LayoutParams params = bar.getLayoutParams();
                    params.height = 0;
                    bar.setLayoutParams(params);
                    ANIMATION_DONE = true;
                }

                @Override
                public void onAnimationRepeat(Animation animation) {
                }
            });

            ani.setDuration(TIME_OF_ANIMATION);
            bar.startAnimation(ani);
        }

    }
}