问题
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 ?
回答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
来源：https://stackoverflow.com/questions/8163399/reason-for-5-sec-delay-to-show-an-activity-on-pressing-the-home-button