如何从顶部扩展像centerCrop这样的ImageView？

import android.content.Context;
import android.util.AttributeSet;
import android.widget.ImageView;

public class TopCropImageView extends ImageView {

    public TopCropImageView(Context context) {
        super(context);
    }

    public TopCropImageView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public TopCropImageView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);

        // 获取ImageView的宽度和测量模式
        int width = getMeasuredWidth();
        int widthMode = MeasureSpec.getMode(widthMeasureSpec);

        // 获取ImageView的高度和测量模式
        int height = getMeasuredHeight();
        int heightMode = MeasureSpec.getMode(heightMeasureSpec);

        // 如果测量模式是精确模式或最大模式，则不需要进行顶部扩展
        if (widthMode == MeasureSpec.EXACTLY || widthMode == MeasureSpec.AT_MOST
                || heightMode == MeasureSpec.EXACTLY || heightMode == MeasureSpec.AT_MOST) {
            return;
        }

        // 计算顶部扩展后的高度
        int desiredHeight = (int) (width * getDrawable().getIntrinsicHeight()
                / (float) getDrawable().getIntrinsicWidth());
        setMeasuredDimension(width, desiredHeight);
    }
}

<com.example.TopCropImageView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:src="@drawable/image"
    android:scaleType="centerCrop" />