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Commit 28644e3b authored by Hui Yu's avatar Hui Yu
Browse files

BG-FGS while-in-use restriction uses the same grace period mechanism as BG-Activity-Launch. 

WindowProcessController.areBackgroundActivityStartsAllowed() has the 10 seconds grace period,
starts from last activity's launch time or finish time.

Expose this method for AMS to call, to determine if BG-FGS while-in-use permission is allowed.

Bug: 182400165
Test: atest cts/tests/app/src/android/app/cts/ActivityManagerFgsBgStartTest.java
Merged-In: I30706dc1950bf5d49926a8e26c0493d9e168eb1b
Change-Id: I3615d0a2dc3464b6e980237b906c83872c3b4bce
parent 4221ca48

services/core/java/com/android/server/am/ActiveServices.java

+4 −0
Original line number Original line Diff line number Diff line
@@ -4891,6 +4891,10 @@ public final class ActiveServices { 
                if (!pr.mAllowBackgroundActivityStartsTokens.isEmpty()) {

                if (!pr.mAllowBackgroundActivityStartsTokens.isEmpty()) {

                    return true;

                    return true;

                }

                }

                if (pr.getWindowProcessController()

                        .areBackgroundActivityStartsAllowedByGracePeriodSafe()) {

                    return true;

                }

            }

            }

        }

        }

services/core/java/com/android/server/wm/WindowProcessController.java

+22 −8
Original line number Original line Diff line number Diff line
@@ -455,15 +455,13 @@ public class WindowProcessController extends ConfigurationContainer<Configuratio 
        mAllowBackgroundActivityStarts = allowBackgroundActivityStarts;

        mAllowBackgroundActivityStarts = allowBackgroundActivityStarts;

    }

    }





    boolean areBackgroundActivityStartsAllowed() {

    public boolean areBackgroundActivityStartsAllowedByGracePeriodSafe() {

        // allow if the whitelisting flag was explicitly set

        synchronized (mAtm.mGlobalLockWithoutBoost) {

        if (mAllowBackgroundActivityStarts) {

            return areBackgroundActivityStartsAllowedByGracePeriod();

            if (DEBUG_ACTIVITY_STARTS) {

                Slog.d(TAG, "[WindowProcessController(" + mPid

                        + ")] Activity start allowed: mAllowBackgroundActivityStarts = true");

        }

        }

            return true;

    }

    }



    boolean areBackgroundActivityStartsAllowedByGracePeriod() {

        // allow if any activity in the caller has either started or finished very recently, and

        // allow if any activity in the caller has either started or finished very recently, and

        // it must be started or finished after last stop app switches time.

        // it must be started or finished after last stop app switches time.

        final long now = SystemClock.uptimeMillis();

        final long now = SystemClock.uptimeMillis();
@@ -485,8 +483,24 @@ public class WindowProcessController extends ConfigurationContainer<Configuratio 
                        + ACTIVITY_BG_START_GRACE_PERIOD_MS

                        + ACTIVITY_BG_START_GRACE_PERIOD_MS

                        + "ms grace period but also within stop app switch window");

                        + "ms grace period but also within stop app switch window");

            }

            }

        }

        return false;

    }





    boolean areBackgroundActivityStartsAllowed() {

        // allow if the whitelisting flag was explicitly set

        if (mAllowBackgroundActivityStarts) {

            if (DEBUG_ACTIVITY_STARTS) {

                Slog.d(TAG, "[WindowProcessController(" + mPid

                        + ")] Activity start allowed: mAllowBackgroundActivityStarts = true");

            }

            }

            return true;

        }



        if (areBackgroundActivityStartsAllowedByGracePeriod()) {

            return true;

        }



        // allow if the proc is instrumenting with background activity starts privs

        // allow if the proc is instrumenting with background activity starts privs

        if (mInstrumentingWithBackgroundActivityStartPrivileges) {

        if (mInstrumentingWithBackgroundActivityStartPrivileges) {

            if (DEBUG_ACTIVITY_STARTS) {

            if (DEBUG_ACTIVITY_STARTS) {