MediaStore.Images.Thumbnails.getThumbnail返回null

import android.Manifest;
import android.content.ContentUris;
import android.content.pm.PackageManager;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Build;
import android.os.Environment;
import android.provider.MediaStore;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import java.io.File;

public class ThumbnailHelper {

    private static final int REQUEST_CODE = 123;

    public Bitmap getThumbnail(String imagePath) {
        if (ContextCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.READ_EXTERNAL/WebAPI_STORAGE}, REQUEST_CODE);
            return null;
        }

        Uri imageUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
        String[] projection = {MediaStore.Images.Media._ID};
        Cursor cursor = getContentResolver().query(imageUri, projection, null, null, null);
        if (cursor != null && cursor.moveToFirst()) {
            int id = cursor.getInt(cursor.getColumnIndex(MediaStore.Images.Media._ID));
            Uri imageUri = ContentUris.withAppendedId(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, id);
            cursor.close();

            Bitmap thumbnail = MediaStore.Images.Thumbnails.getThumbnail(getContentResolver(), id, MediaStore.Images.Thumbnails.MINI_KIND, null);
            if (thumbnail != null) {
                return thumbnail;
            } else {
                // 尝试等待缩略图生成
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                return MediaStore.Images.Thumbnails.getThumbnail(getContentResolver(), id, MediaStore.Images.Thumbnails.MINI_KIND, null);
            }
        }
        return null;
    }
}