Android security testing is more often used by security industries to test the vulnerabilities in Android applications. After web applications, more concern area is mobile application penetration test. Android framework includes the following key services- application lifecycle and stack are controlled by the activity manager. Android apps will be compiled when a user installs them on their device whereas in the Dalvik used Just-in-time(JIT) compilation in which bytecode is compiled when the user runs the app. In Ahead-of-time (AOT) Compilation, Android apps are compiled when they are installed.”]
Source: https://gbhackers.com/android-application-penetration-testing-1/