如何下载路径存储在sql数据库android中的文件？

// 步骤1：创建数据库表
public class DBHelper extends SQLiteOpenHelper {
    private static final String DATABASE_NAME = "download.db";
    private static final int DATABASE_VERSION = 1;
    private static final String TABLE_NAME = "downloads";
    private static final String COLUMN_ID = "_id";
    private static final String COLUMN_PATH = "path";

    public DBHelper(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        String createTableQuery = "CREATE TABLE " + TABLE_NAME + " (" +
                COLUMN_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
                COLUMN_PATH + " TEXT)";
        db.execSQL(createTableQuery);
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        // 升级数据库时的操作
    }
}

// 步骤2：下载文件
public void downloadFile(String url) {
    DownloadManager downloadManager = (DownloadManager) getSystemService(Context.DOWNLOAD_SERVICE);
    DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url));
    long downloadId = downloadManager.enqueue(request);
}

// 步骤3：获取下载路径
public String getDownloadPath(long downloadId) {
    DownloadManager downloadManager = (DownloadManager) getSystemService(Context.DOWNLOAD_SERVICE);
    DownloadManager.Query query = new DownloadManager.Query();
    query.setFilterById(downloadId);
    Cursor cursor = downloadManager.query(query);
    if (cursor.moveToFirst()) {
        int columnIndex = cursor.getColumnIndex(DownloadManager.COLUMN_LOCAL_URI);
        String downloadPath = cursor.getString(columnIndex);
        cursor.close();
        return downloadPath;
    }
    cursor.close();
    return null;
}

// 步骤4：存储路径到数据库
public void savePathToDatabase(String path) {
    DBHelper dbHelper = new DBHelper(this);
    SQLiteDatabase db = dbHelper.getWritableDatabase();
    ContentValues values = new ContentValues();
    values.put(DBHelper.COLUMN_PATH, path);
    db.insert(DBHelper.TABLE_NAME, null, values);
    db.close();
}