App name use Chinese,toga demo,app icon customized....

[guaiguaicai]

Describe the bug
Question 1:
When using the briefcase new command, the App wants to use the Chinese name, but an error occurs:
Question 2:
The title in self.main_window = toga.MainWindow(title=self.formal_name) is customized, such as "hello", there is no effect when the Android App is running
Question 3:
Can the App icon be customized, and if so, where is the tutorial?
Question 4:
Where can there be more detailed grammar instructions or demos for toga? The online documentation says it is too simple to operate. For example, toga.MainWindow's info_dialog, I don't know how to use it if I want to use it.

Thank you very much for making such a good software as beeware, which can make Python have infinite possibilities, thank you!

To Reproduce
Steps to reproduce the behavior:
Formal Name [Hello World]: 学口算
Traceback (most recent call last):
File "D:\Python\Python38\lib\runpy.py", line 194, in _run_module_as_main
return run_code(code, main_globals, None,
File "D:\Python\Python38\lib\runpy.py", line 87, in run_code
exec(code, run_globals)
File "D:\Python\Python38\envs\beeware\Scripts\briefcase.exe_main.py", line 7, in
File "d:\python\python38\envs\beeware\lib\site-packages\briefcase_main.py", line 11, in main
command(**options)
File "d:\python\python38\envs\beeware\lib\site-packages\briefcase\commands\new.py", line 523, in call
state = self.new_app(template=template, **options)
File "d:\python\python38\envs\beeware\lib\site-packages\briefcase\commands\new.py", line 461, in new_app
context = self.build_app_context()
File "d:\python\python38\envs\beeware\lib\site-packages\briefcase\commands\new.py", line 320, in build_app_context
class_name = self.make_class_name(formal_name)
File "d:\python\python38\envs\beeware\lib\site-packages\briefcase\commands\new.py", line 84, in make_class_name
if class_name[0].isdigit():
IndexError: string index out of range

Expected behavior
A clear and concise description of what you expected to happen.

Screenshots
If applicable, add screenshots to help explain your problem.

Environment:

Operating System: win10
Python version: 3.8
Software versions:
Briefcase: 0.3.5
Toga:
...
Additional context
In English mode, I can use beeware normally. But I have difficulty in using beeware personally, and I want the help of detailed documentation and demo
Or where there are learning exchanges and places, there are too few materials to find

I also asked a question under beeware. I asked the wrong place. Please delete that question, thank you!

Thank you very much for making such a good software as beeware, which can make Python have infinite possibilities, thank you!

[freakboy3742]

1 looks like a bug, caused by not testing non-Latin app names. That should be a relatively simple thing to fix if you want to try contributing a fix.

2 also looks like a bug; the Android app is taking it's window title from the app, not the MainWindow. This won't be as simple to fix, but shouldn't be too hard.

The App icon can be customised, using the icon setting in your project file, as well as some Android specific requirements. If you would like an example of what this looks like in practice this project may be helpful.

As for other documentation - all the available documentation for toga is at https://toga.readthedocs.io. There's definitely a need for a lot more documentation - as a project, we're still at v0.3, and documentation is one of the things we know we need to improve.

[guaiguaicai]

Formal Name cannot contain the symbol '' when assigned, and there is an error compiling, which is a bug.

Second, I'm still learning python, and I'm honored to be able to patch bugs for beeware, but I don't know how to fix them.
Icon customization I will try to use, thank you for your advice.

[freakboy3742]

I've opened #612 to track the first problem you describe; and #613 to track the second.