android widget - Reason for 5 sec delay to show an activity on pressing the home button?

Question

I am facing delay of 5 sec to show an Activity after pressing the HOME key. I had gone through some post and found that after pressing the HOME button, android prevents services and broadcast-receivers from calling startActivity for 5 seconds.

Q1. Can anyone please let me know the reason to happening this delay ?

Q2. When I modified the ActivityManagerService::checkAppSwitchAllowedLocked() to always return true, it avoids checking lock and hence Activity gets shown without any delay. Would it be a good solution to avoid delay or it may cause any wrong effect in other ways ?

Answer 1

I know, it's probably too late (half year passed). However, here is the answer

• You won't be able to get this permission on not rooted phone, unless your application is signed with the same keys as system. Android has some permissions like that.

• Also, you may be interested to check this question. Starting an activity from a service after HOME button pressed without the 5 seconds delay