Android Question change the install unknown apps item for the first time without user interaction

[Masoud44]

hello everyone
I have a question that has been bothering me for a long time and it's on my nerve.
How can I change the install unknown apps item for the first time without user interaction in b4a?
If you say this is impossible! So how can any app like package installer or any app marketing like google store change that for the first time without user interaction?

 

[Erel]

If you say this is impossible!

Impossible unless your app is a system app. System apps can do many things that regular apps cannot do.

 

[Masoud44]

Impossible unless your app is a system app

Is it possible to write a system app with b4a or b4j or should it be done with languages such as assembly and C?

 

[Erel]

It is not related to the programming language. You need to sign the app with the system private key. You will not have one unless you are building your own ROM.

 

[Masoud44]

Is it possible to run apk with shell? (With this, I intend to give the installation control to the package installer)

 

[Erel]

No.