Methods that are executed on the main thread in Android

1) Activity life cycle methods, such as: OnCreate (), OnStart (), Onresume (), onStop (), etc.

2) Event handling methods, such as OnClick (), Onitemclick (), etc.

In general, the execution time of the activity's OnCreate (), OnStart (), Onresume () method determines the time that your app's home page is opened, where you can try to put unnecessary actions on other threads, and if it's still time consuming, use the Welcome screen. Using the Welcome interface is best done with dynamic, so users know that your app is not dead.

Methods that are executed on the main thread in Android