Google Drive 从文件夹获取文件

Question

如何获得特定文件夹的文件列表从谷歌驱动器使用驱动器api。

参考资料 :: https:/developers.google.comdriveandroiddeprecation。

FileList

 public  Task<FileList> fetchLatestInformation(@NotNull String backupDir) {
        return Tasks.call(mExecutor, () -> {
            Drive.Files.List list = drive.files().list().setFields("nextPageToken, files(id, name, modifiedTime, size, createdTime, parents, appProperties)");
            StringBuilder sb = new StringBuilder();
            sb.append("mimeType = 'application/vnd.google-apps.folder' and name = '");
            sb.append(backupDir);
            sb.append("'");
            list.setQ(sb.toString());
            list.setPageSize(1000);
            list.setOrderBy("modifiedTime");
            return list.execute();
        });
    }

ActivityCode

    googleDrive.fetchLatestInformation(backupDir)
            .addOnSuccessListener {
                var files = it.files
                files.reverse()
                files.forEach {
                    Log.e(TAG,"file :: ${it?.name}")
                }
                var file = files.firstOrNull()

                if (file != null) {
                    var time = file.modifiedTime
                    var date = Date(time.value)
                    var simpleDateFormat = SimpleDateFormat("EEE, dd MMM yyyy hh:mm aaa")
                    Log.e(TAG,"lastBackup name :: ${file.name}")
                    Log.e(TAG,"lastBackup date :: ${simpleDateFormat.format(date)}")
                    Log.e(TAG,"lastBackup size :: ${file.getSize()?.formatFileSize}")

                }
            }
            .addOnFailureListener {
                it.printStackTrace()
            }

LogResult

E/BackupActivity: file :: AppBackup
E/BackupActivity: lastBackup name :: AppBackup
E/BackupActivity: lastBackup date :: Tue, 19 May 2020 10:44 PM
    lastBackup size :: null

不过 AppBackup 是包含备份文件zips的目录，所以我的问题是如何获得一个文件是存储在 AppBackup 目录。

注意：: 我正在使用DRIVE API V3

Answer 1

使用HTTP请求GET https://www.googleapis.com/drive/v2/files/folderId/children 用文件夹Id获取文件夹的子文件夹

import com.google.api.services.drive.Drive;
import com.google.api.services.drive.Drive.Children;
import com.google.api.services.drive.model.ChildList;
import com.google.api.services.drive.model.ChildReference;

import java.io.IOException;

// ...

public class MyClass {

  // ...

  /**
   * Print files belonging to a folder.
   *
   * @param service Drive API service instance.
   * @param folderId ID of the folder to print files from.
   */
  private static void printFilesInFolder(Drive service, String folderId)
      throws IOException {
    Children.List request = service.children().list(folderId);

    do {
      try {
        ChildList children = request.execute();

        for (ChildReference child : children.getItems()) {
          System.out.println("File Id: " + child.getId());
        }
        request.setPageToken(children.getNextPageToken());
      } catch (IOException e) {
        System.out.println("An error occurred: " + e);
        request.setPageToken(null);
      }
    } while (request.getPageToken() != null &&
             request.getPageToken().length() > 0);
  }

  // ...

}

更多 核对

Answer 2

public  Task<FileList> fetchLatestInformation(@NotNull String parentFolderId) {
        return Tasks.call(mExecutor, () -> {

            Drive.Files.List list = drive.files().list().setFields("nextPageToken, files(id, name, modifiedTime, size, createdTime, parents, appProperties)");
            StringBuilder sb = new StringBuilder();
            sb.append("'");
            sb.append(parentFolderId);
            sb.append("'");
            sb.append(" in parents and mimeType != 'application/vnd.google-apps.folder' and trashed = false");
            list.setQ(sb.toString());
            list.setPageSize(1000);
            list.setOrderBy("modifiedTime");
            return list.execute();
        });
    }

Children.List 在V3中被删除了，所以我们要使用list()，我们可以通过使用 'parentFolderId' in parents and mimeType != 'application/vnd.google-apps.folder' and trashed = false

在v2中。Children: list 是用来列出一个文件夹的子文件夹，要列出根文件夹的所有子文件夹，请使用别名root作为文件夹Id值。

然而，在 迁移到Google Drive API v3 该 Children 和 Parents 收藏品已被删除。使用 files.list 而不是。

参考资料 : 如何用java搜索google drive V3中的文件夹？