如何从Android服务保存数据？

SharedPreferences sharedPreferences = getSharedPreferences("my_preferences", MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.putString("key", "value");
editor.commit();

FileOutputStream fileOutputStream = openFileOutput("my_file", Context.MODE_PRIVATE);
fileOutputStream.write("data".getBytes());
fileOutputStream.close();

SQLiteDatabase db = openOrCreateDatabase("my_database", MODE_PRIVATE, null);
db.execSQL("CREATE TABLE IF NOT EXISTS my_table (id INTEGER PRIMARY KEY, data TEXT)");
ContentValues contentValues = new ContentValues();
contentValues.put("data", "value");
db.insert("my_table", null, contentValues);
db.close();

@Database(entities = {MyEntity.class}, version = 1)
public abstract class MyRoomDatabase extends RoomDatabase {
    public abstract MyDao myDao();
}

@Entity
public class MyEntity {
    @PrimaryKey
    public int id;
    public String data;
}

public class MyDao extends RoomDatabase.Callback {
    @Override
    public void onCreate(@NonNull SupportSQLiteDatabase db) {
        super.onCreate(db);
        // Create table
    }
}

// 初始化云存储服务
COSClient cosClient = new COSClient(new BasicCOSAuthCredentials("secretId", "secretKey"));

// 上传文件到云存储
PutObjectRequest putObjectRequest = new PutObjectRequest("bucketName", "objectName", new File("localFilePath"));
cosClient.putObject(putObjectRequest);

// 下载文件从云存储
GetObjectRequest getObjectRequest = new GetObjectRequest("bucketName", "objectName");
COSObject cosObject = cosClient.getObject(getObjectRequest);
InputStream inputStream = cosObject.getObjectContent();