Who is responsible for calling the start method during the Android application launch process?

In Android, the start() method is usually not called directly by the developer, but is managed by the system.

If it concerns launching an Activity, then the lifecycle is controlled by the Android system, which calls methods like onCreate(), onStart(), onResume(), etc.

If the question is about a thread (Thread), then the start() method is called by the developer to initiate a new thread, after which the run() method is called within that thread.

In the context of launching an application on Android, the calling of lifecycle methods is handled by the Android Runtime and Activity Manager, which manage the states of application components.

Thus, the system itself is responsible for calling the start method during application launch, managing the lifecycle of components such as Activities and Services.