Spying on Android events without modifying source code

Let’s say you want to intercept events in an Android app, but don’t want to modify your source code. As a simple example, you want to add logging whenever the user clicks on any button in your app. I got a bit curious about whether it was possible so I spent some time last week figuring out how this might work. This was extra fun because I’ve never written and Android app, and it’s been years since I did anything in the Java ecosystem.

http://kamalmarhubi.com/blog/2016/10/03/android-events/index.html

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