There are many ways to remove the advertisement of an App: you can directly remove the internet access right with mobile phone management software, or you can use advertising software such as Adblock Plus, Adblock Plus, AdAway and so on.

For those complicated advertisements, you can unpack them with Apktool and view the Androidmanifest.xml file, which will generally remove the activities; Of the configuration file; Slightly tough to modify the layout file, some tough ones will need to change the code to smali, some tough ones may need to modify some non-smali code, and so on. Of course, many times these methods will be used together. If there is a button to remove the advertisement inside the app, you can also consider cracking it to achieve the purpose of removing the advertisement.