如何在android中添加显示和隐藏actionbar的动画？

<androidx.appcompat.widget.Toolbar
    android:id="@+id/toolbar"
    android:layout_width="match_parent"
    android:layout_height="?attr/actionBarSize"
    android:background="?attr/colorPrimary"
    android:elevation="4dp"
    android:theme="@style/ThemeOverlay.AppCompat.ActionBar" />

private ActionBar actionBar;
private ObjectAnimator showAnimator;
private ObjectAnimator hideAnimator;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    // 获取ActionBar实例
    setSupportActionBar(findViewById(R.id.toolbar));
    actionBar = getSupportActionBar();

    // 创建显示动画
    showAnimator = ObjectAnimator.ofFloat(actionBar, "translationY", -actionBar.getHeight(), 0);
    showAnimator.setDuration(200);

    // 创建隐藏动画
    hideAnimator = ObjectAnimator.ofFloat(actionBar, "translationY", 0, -actionBar.getHeight());
    hideAnimator.setDuration(200);
}

private int previousScrollY = 0;

@Override
public void onScrollChanged() {
    int scrollY = getScrollY();

    if (scrollY > previousScrollY) {
        // 向下滚动，隐藏ActionBar
        hideActionBar();
    } else {
        // 向上滚动，显示ActionBar
        showActionBar();
    }

    previousScrollY = scrollY;
}

private void showActionBar() {
    if (actionBar != null && actionBar.getTranslationY() < 0) {
        showAnimator.start();
    }
}

private void hideActionBar() {
    if (actionBar != null && actionBar.getTranslationY() == 0) {
        hideAnimator.start();
    }
}