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

Answer 2

Check in adb shell in below manner.

adb shell
adb logcat -b events | grep am_activity_launch_time

[Output]
01-01 12:32:53.469 1236 1262 I am_activity_launch_time: 
    [0,205360373,com.sec.android.app.clockpackage/.ClockPackage,378,**378**,0]

Remarks:
Launch time for Clock is 378ms.

Answer 3

Use SysTrace

Also the Trace class can be used to measure sections using

Trace.beginSection("name");
Trace.endSection();

This YouTube video is a quick primer as well.