如何从drawable加载图像并将其转换为位图

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.Drawable;

public class ImageUtils {

    public static Bitmap drawableToBitmap(Context context, int drawableResId) {
        // 从资源中获取Drawable对象
        Drawable drawable = context.getResources().getDrawable(drawableResId);
        
        if (drawable instanceof BitmapDrawable) {
            return ((BitmapDrawable) drawable).getBitmap();
        }

        // 创建Bitmap对象
        Bitmap bitmap = Bitmap.createBitmap(drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight(), Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(bitmap);
        drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight());
        drawable.draw(canvas);

        return bitmap;
    }
}

BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeResource(context.getResources(), drawableResId, options);

// 计算inSampleSize
options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);

// 解码Bitmap
options.inJustDecodeBounds = false;
Bitmap bitmap = BitmapFactory.decodeResource(context.getResources(), drawableResId, options);