Measure Android app startup time

Question

What is the most precise way to measure startup time of an Android app?

By startup time I mean the difference between 2. and 3. :

1. The app process is no

Answer 1

A simple way to display startup time in android.

Sometimes the Displayed line in the logcat output contains an additional field for total time. For example:

ActivityManager: Displayed com.android.myexample/.StartupTiming: +3s534ms (total +1m22s643ms)

In this case, the first time measurement is only for the activity that was first drawn

Source: Time to initial display