Google Drive REST API通知对应用程序文件夹中的更改无效

Question

根据文档，应该可以使用setspaces（“AppDataFolder”）注册一个通知通道，用于更改我的应用程序的应用程序文件夹。

但是，在设置频道时，我只得到初始的sync通知，而在应用程序文件夹中更改某些内容时，则不会得到change通知。

这就是我如何设置通道的，其中mdrive是com.google.api.services.drive.drive的完全初始化和授权的实例

channelId = UUID.randomUUID().toString();
channelExpiration = System.currentTimeMillis() + CHANNEL_LIVETIME_MILLIS;
Channel channel = new Channel();
channel.setType("web_hook");
channel.setId(channelId);
channel.setAddress(DRIVE_API_CALLBACK_RECEIVER_URL);
channel.setToken("...");
channel.setExpiration(channelExpiration);
Channel result = mDrive.changes().watch(channel).setSpaces("appDataFolder").execute();

Answer 1

你有设置这个的范围吗？确保您有足够广泛的范围来包括“App DataFolder”。我的意思是你应该能够从这里得到一些结果：

/**
 * Print metadata for the Application Data folder.
 *
 * @param service Drive API service instance.
 */
private static void printApplicationDataFolderMetadata(Drive service) {
  try {
    File file = service.files().get("appfolder").execute();

    System.out.println("Id: " + file.getId());
    System.out.println("Title: " + file.getTitle());
  } catch (IOException e) {
    System.out.println("An error occured: " + e);
  }
}

我想以上可能是你的问题。在设置作用域时，请确保包含drive.appfolder或更正式的

https://www.googleapis.com/auth/drive.appfolder

此外，是否检查结果是否为NULL？您确实应该将通道result=...行放在try{}catch（IOExeption e）{}中，如果有类似本例（从这里开始）的错误，则打印错误。

  /**
   * Watch for all changes to a user's Drive.
   *
   * @param service Drive API service instance.
   * @param channelId Unique string that identifies this channel.
   * @param channelType Type of delivery mechanism used for this channel.
   * @param channelAddress Address where notifications are delivered.
   * @return The created channel if successful, {@code null} otherwise.
   */
  private static Channel watchChange(Drive service, String channelId,
      String channelType, String channelAddress) {
    Channel channel = new Channel();
    channel.setId(channelId);
    channel.setType(channelType);
    channel.setAddress(channelAddress);
    try {
      return service.changes().watch(channel).execute();
    } catch (IOException e) {
      e.printStackTrace();
      // ADD A LOG OR PRINT STATEMENT HERE 
      Log.e("DRIVEAPI", "Error: " + e.toString())
    }
    return null;
  }

您的代码应该如下所示：

channelId = UUID.randomUUID().toString();
channelExpiration = System.currentTimeMillis() + CHANNEL_LIVETIME_MILLIS;
Channel channel = new Channel();
channel.setType("web_hook");
channel.setId(channelId);
channel.setAddress(DRIVE_API_CALLBACK_RECEIVER_URL);
channel.setToken("...");
channel.setExpiration(channelExpiration);
try {
    Channel result = mDrive.changes().watch(channel).setSpaces("appDataFolder").execute();
    if(result != null) {
        // do whatever you want with result Channel
    } else {
        Log.e("DRIVEAPI", "Error: result is null for some reason!");
    }
} catch (IOException e) {
    e.printStackTrace()
    Log.e("DRIVEAPI", "Error: " + e.toString());
}