以下是一个使用Android动画库来实现评分栏动画化展开和收缩每个星星的示例代码：

首先，确保你已经添加了Android动画库的依赖项。可以在build.gradle文件中添加以下行来添加依赖项：

implementation 'com.android.support:design:28.0.0'

接下来，在你的布局文件中添加一个包含星星的评分栏。可以使用RecyclerView或LinearLayout等布局：

然后，在你的活动或碎片中使用以下代码来设置动画：

private boolean isExpanded = false;

private void toggleRatingBar() {
    LinearLayout ratingBarContainer = findViewById(R.id.ratingBarContainer);
    ImageView star1 = findViewById(R.id.star1);
    ImageView star2 = findViewById(R.id.star2);
    ImageView star3 = findViewById(R.id.star3);
    ImageView star4 = findViewById(R.id.star4);
    ImageView star5 = findViewById(R.id.star5);

    if (isExpanded) {
        // 收缩动画
        AnimationUtils.collapse(ratingBarContainer);
        isExpanded = false;
    } else {
        // 展开动画
        AnimationUtils.expand(ratingBarContainer);
        isExpanded = true;
    }

    // 每个星星的动画
    AnimationUtils.animateStar(star1);
    AnimationUtils.animateStar(star2);
    AnimationUtils.animateStar(star3);
    AnimationUtils.animateStar(star4);
    AnimationUtils.animateStar(star5);
}

最后，你需要创建一个辅助类AnimationUtils，其中包含展开和收缩评分栏动画以及每个星星的动画：

import android.view.View;
import android.view.ViewGroup;
import android.view.animation.Animation;
import android.view.animation.Transformation;
import android.widget.ImageView;

public class AnimationUtils {

    public static void expand(final View view) {
        view.measure(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
        final int targetHeight = view.getMeasuredHeight();

        view.getLayoutParams().height = 0;
        view.setVisibility(View.VISIBLE);

        Animation animation = new Animation() {
            @Override
            protected void applyTransformation(float interpolatedTime, Transformation t) {
                view.getLayoutParams().height = interpolatedTime == 1
                        ? ViewGroup.LayoutParams.WRAP_CONTENT
                        : (int) (targetHeight * interpolatedTime);
                view.requestLayout();
            }

            @Override
            public boolean willChangeBounds() {
                return true;
            }
        };

        animation.setDuration((int) (targetHeight / view.getContext().getResources().getDisplayMetrics().density));
        view.startAnimation(animation);
    }

    public static void collapse(final View view) {
        final int initialHeight = view.getMeasuredHeight();

        Animation animation = new Animation() {
            @Override
            protected void applyTransformation(float interpolatedTime, Transformation t) {
                if (interpolatedTime == 1) {
                    view.setVisibility(View.GONE);
                } else {
                    view.getLayoutParams().height = initialHeight - (int) (initialHeight * interpolatedTime);
                    view.requestLayout();
                }
            }

            @Override
            public boolean willChangeBounds() {
                return true;
            }
        };

        animation.setDuration((int) (initialHeight / view.getContext().getResources().getDisplayMetrics().density));
        view.startAnimation(animation);
    }

    public static void animateStar(final ImageView star) {