In Visual Sutdio 2019, Angular+ .net core identity is nearly done by a single click. But that is not easy if you wish to add extra custom claims. I have tried to used IdentityResource or IProfileService to config the Identity server at Startup.cs. That is not successful. That is easier to build own in this case. Mainly, you need to build login service by yourself.
At this stage, I believe the angular code can be reuse. I just need to config it to use my own login url.

I don't know why the default .net core angular template all routes in the app.modules.ts like this

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Then in the app.modules.ts, it will import the routes

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This approach is more clear

The X-Bows Keyboard started from the Kickstarter a few years ago. It has an unusual keyboard pattern, and it claimed to balance performance and comfort. That is a very attractive slogan. So, I bought one to test it out for USD$125 (Non-LED backlight version).
I took about two weeks shipped from China to Australia. Firstly, I have to admire their customer support very promptly. They answered my question unless than 24 hours. Secondly, their built quality is excellent; the keyboard feels solid. Thirdly, the pattern of the keyboard is quite unusual. It took me three days to adapt. After I get used to the pattern, the typing is fast, very similar to the standard keyboard. Moreover, it is quite ergonomic; it is a natural hand position.
Besides, the wrist rest is very high quality. I cannot find anyone as comfort as like this one
However, there are some downsides. Firstly, you have to very careful to update the firmware. First times, I did that. I "killed" my keyboard. Please do not worry, after I contacted their support team, and they gave me a software to reflash the ROM. Then it works again. Another downside is the keyword switch is Gateron, not cherry MX. I found the typing experience is a bit less comfortable than cherry.

In general, I love this keyboard.

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There is not listview in more modern Android SDK. The replacement of this is RecyclerView, that is more flexible, you can set the layout manager, such as LinearLayoutManager or GridLayoutManager, even you can build your own. But that is more powerful, then that is harder to use. The first program I built, I found it only shows the first element. Then I found in the layout resource file of list adapter, the root element cannot set the height to be "match_parent", if you set "match_parent", the first element will be occupied the whole list, then no room for another elements. So the solution is to the height to be the fixed value or "wrap_content.

There are a lot of ORM for Android. Previously, I have used Ormlite. That is quite good. I got a new personal project of Android App. This is a good to look around new framework I can use. I found Google has their ORM layer. That is not form the standard SDK. This ORM is from the Android Architecture Components. That is quite modern, and similar with others. It used annotations like this to define the mapping

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But the Dao is a strange

public  interface DrawingEventDao {
    @Query("SELECT * FROM drawEvents")
    List loadAll();
}

Because it is a ORM of sqlite. You still need to write the SQL like this. That is the things I do not really like. Maybe I have been LINQ for too long. That is not easy to go back the SQL. But that is still much better than connecting with Sqlite