Android Question How to use the AVDmanger change the Platform

[winjiadh]

I want test my B4A project in computer
I click the menu "Tools"-->"Run AVD Manager"
In B4A AVDManger, the Platform only one Platform 28(default, x86_64), like the picture

I use the Sdk Manager, installed the Android plaform-tools and 30 29 28 26
but can't change

I want change the platform to platform 30 or platform 29
How to do it?
Thanks for replay

 

[Erel]

Search for 30. You need to install a system image.

 

[winjiadh]

Thanks,That's great! you're the best!
but How to delete the no used platforms?
like this picture, I want delete the choise file, how to do it?
thks

 

[winjiadh]

Oh ,I find it in the android-30
it's a good job
I can delete the no used files.

 

[Erel]

Open the SDK folder. You can delete the unused platforms.