Android app lock get foreground process package name method

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Get the package name of the foreground process in the following ways:

1.android API 10-20

Obtained by Getrunningtasks in Activitymanager.

2.android API 21-22 ( part of the Google update package is not upgraded)

Because the system disables the Getrunningtasks interface above API 21.

Get through getrunningappprocesses in Activitymanager

Cons: Possible miscarriage (probability is low)

3.android API 22

Because the system has disabled the Getrunningappprocesses interface above 22.

Combined with/proc/pid/oom_adj values and bg_non_interactive

Cons: Possibility of miscalculation (probability generally)

4.android API and above:

Combined with/proc/pid/oom_score values and bg_non_interactive

Cons: Possible miscarriage (higher probability)

5. Android API 22 and above:

Obtained by Usagestatsmanager's queryevents interface after opening usagestats permissions

Android app lock get foreground process package name method