APIExample | 以API接口开发为例，探索开发的最佳实践 | REST library

IMHO you will need to use tesseract API https://github.com/tesseract-ocr/tessdoc/blob/master/APIExample.md#example-of-iterator-over-the-classifier-choices-for-a-single-symbol

The issue is exactly mentioned in the message. Gradle cannot resolve com.github.agorabuilder:native-full-sdk:3.4.2 dependency in any of the repositories that were added in the module.

Did you have jitpack repo defined there?

Google provides a set of sample programs that exemplify the usage of its Client Library for Java (also for a couple of other implementation programming languages/environments).

There you can find the source file Auth.java that implements persistence of user credential data:

A typed array has a toString method that takes no argument, so providing 'hex' to it will have no influence, it will just join the values into a comma-separated list of the values in decimal representation.

To get hexadecimal output, you'll need to iterate the array and convert each value to hex and concatenate the result:

I would recommend maybe reformatting your request by putting your constant values in the Client object declaration and also wrapping the request in a try-catch block. The try-catch block provides the added benefit that it will help you debug the response. Feel free to alter the catch statement as you wish.

The problem with your code above boils down to the following doc entry:

playlistId (string)

The playlistId parameter specifies the unique ID of the playlist for which you want to retrieve playlist items. Note that even though this is an optional parameter, every request to retrieve playlist items must specify a value for either the id parameter or the playlistId parameter.

Things should come into light by now: playlistId is the ID of a playlist, hence cannot be the ID of a channel.

But for listing all uploaded videos of a given channel (identified by its ID), one has to do the following:

Invoke the PlaylistItems.list API endpoint queried with the parameter playlistId set to the ID of that channel's uploads playlist.

This latter ID may very easily be obtained by invoking the Channels.list endpoint queried with the parameter id set to your channel's ID.

The uploads playlist ID is then to be found within the endpoint's JSON response as value of the property:

items[0].contentDetails.relatedPlaylists.uploads.

Translated to Java, this property path would become the following chain of getters, ending with getUploads:

.getItems().get(0).getContentDetails().getRelatedPlaylists().getUploads().

Note that for a given channel, you need to obtain the uploads playlist ID only once, then use it as many times as you wish.

Usually, a channel ID and its corresponding uploads playlist ID are related by s/^UC([0-9a-zA-Z_-]{22})$/UU\1/.

According to the official docs, once you invoke the Channels.list API endpoint -- that returns the specified channel's meta-data, a Channels resource --, you have at your disposal the following property:

statistics.videoCount (unsigned long)
The number of public videos uploaded to the channel.

Therefore, things are almost obvious: make the value returned by this property persistent (e.g. save it into a file) and arrange your program such that to be issued weekly for to compute your desired upload rate.

Now, for what concerns your code above, you should first get rid of:

If you only intend to use the Channels.list API endpoint for to obtain public channel meta-data, then there's definitely no need to employ OAuth 2.0 authorization (and the implied one-time authentication).

The YouTube.Channels.list class has this method, that allows you to set the API key provided (as private data) by Google (via its cloud console):

setKey

public YouTube.Channels.List setKey(java.lang.String key)

Description copied from class: YouTubeRequest
API key. Your API key identifies your project and provides you with API access, quota, and reports. Required unless you provide an OAuth 2.0 token.

Overrides: setKey in class YouTubeRequest

You may look at the sample source file GeolocationSearch.java from Google for to see setKey in action:

According to the official doc you yourself quoted, for to invoke the Videos.update API endpoint, you need to be properly authorized:

Authorization

This request requires authorization with at least one of the following scopes (read more about authentication and authorization).

Scope

https://www.googleapis.com/auth/youtubepartner
https://www.googleapis.com/auth/youtube
https://www.googleapis.com/auth/youtube.force-ssl

Consequently, there's no way you can avoid using OAuth 2.0 authentication/authorization flow within you app. Note that API keys are used and useful for reading-only public data.

For the part of your question that says:

[...] it is impossible to open a browser window and make the user to do a oauth login and authorization in a quartz job [...]

the API has solutions. Do read the following two docs: OAuth 2.0 for Mobile & Desktop Apps and Using OAuth 2.0 for Web Server Applications.

A brief, top-level description of what you'll have to do is provided by the answer I gave recently to a similar question. That answer may help you understand more easily the way to attain a solution to your problem.