Nextcloud Android 客户端 - 安全高效的文件同步与管理

// 示例代码：添加Nextcloud账户AccountManager accountManager = AccountManager.get(context);Account newAccount = new Account(accountName, "nextcloud");accountManager.addAccountExplicitly(newAccount, password, null);

// 创建上传任务OCUpload ocUpload = new OCUpload(    localFilePath,     remotePath,     accountName);UploadsStorageManager uploadsStorageManager = new UploadsStorageManager(contentResolver);uploadsStorageManager.storeUpload(ocUpload);

OCFile file = storageManager.getFileByPath(remotePath);DownloadFileOperation download = new DownloadFileOperation(    user,     file,     context);download.execute(client);

// 创建文件夹CreateFolderOperation createOp = new CreateFolderOperation(    path,     user,     context,     storageManager);createOp.execute(client);
// 删除文件RemoveFileOperation removeOp = new RemoveFileOperation(    file,     false,     user,     false,     context,     storageManager);removeOp.execute(client);

// 配置自动同步文件夹SyncedFolder syncedFolder = new SyncedFolder(    localPath,    remotePath,    true,  // WiFi only    false, // Charging only    true,  // Upload existing    accountName);SyncedFolderProvider provider = new SyncedFolderProvider(contentResolver);provider.storeSyncedFolder(syncedFolder);

/** * OCFile类表示Nextcloud中的文件或文件夹 */public class OCFile implements Parcelable, Comparable<OCFile>, ServerFileInterface {    private String remotePath;  // 远程路径    private String localPath;   // 本地存储路径    private String mimeType;    // MIME类型    private long fileLength;    // 文件大小    private long modifiedAt;    // 修改时间    private boolean isFolder;   // 是否是文件夹        // 获取文件缩略图    public Bitmap getThumbnail(Context context) {        return ThumbnailsCacheManager.getBitmapFromDiskCache(            String.valueOf(getFileId()),            context.getResources().getDisplayMetrics()        );    }}

/** * 端到端加密元数据管理 */public class DecryptedFolderMetadataFileV1 {    private DecryptedMetadata metadata;    private Map<String, DecryptedFile> files;        public static class DecryptedFile {        private Data encrypted;        private String initializationVector;        private String authenticationTag;                // 获取加密文件数据        public Data getEncrypted() {            return this.encrypted;        }    }}

/** * 账户认证Activity */public class AuthenticatorActivity extends AppCompatActivity {    private AccountAuthenticatorResponse mAccountAuthenticatorResponse;        protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        // 初始化认证响应        mAccountAuthenticatorResponse = getIntent().getParcelableExtra(            AccountManager.KEY_ACCOUNT_AUTHENTICATOR_RESPONSE        );    }        // 处理登录成功    private void onLoginSuccess(String username, String password, String serverUrl) {        Account account = new Account(username, "nextcloud");        Bundle result = new Bundle();        result.putString(AccountManager.KEY_ACCOUNT_NAME, account.name);        result.putString(AccountManager.KEY_ACCOUNT_TYPE, account.type);        setAccountAuthenticatorResult(result);    }}