Launch Time of an app

Question

What is the best way to launch an app and calculate its launch time in android(if it can be done with some code,then its better)

Answer 1

There will be an automatic log something like

system_process I/ActivityManager﹕ Displayed com.android.vending/com.google.android.finsky.activities.MainActivity: +549ms

to show the launch time of an app from the user typing on it to the app be ready to interact with user further more. That is from ActivityManager.

Also, using log to measure the time from onCreate() to onResume should be another good way.