android 5.1 清除最近任务后将launcher强制关闭，再按返回键黑屏问题

在Ａ６４ android 5.1 平台发现清除最近任务后将launcher强制关闭，再按返回键黑屏，不会自动启动ｌａｕｎｃｈｅｒ问题。

添加以下处理解决黑屏问题:

frameworks/base/services/core/java/com/android/server/am/ActivityStackSupervisor.java

diff --git a/services/core/java/com/android/server/am/ActivityStackSupervisor.java b/services/core/java/com/android/serve

index 78a8e2a..3440c9b 100755

--- a/services/core/java/com/android/server/am/ActivityStackSupervisor.java

+++ b/services/core/java/com/android/server/am/ActivityStackSupervisor.java

@@ -836,6 +836,13 @@ public final class ActivityStackSupervisor implements DisplayListener {

moveHomeStackTaskToTop(HOME_ACTIVITY_TYPE, reason);

startActivityLocked(null, intent, null, aInfo, null, null, null, null, 0, 0, 0, null,

0, 0, 0, null, false, null, null, null);

+

+ if (inResumeTopActivity) {

+ // If we are in resume section already, home activity will be initialized, but not

+ // resumed (to avoid recursive resume) and will stay that way until something pokes it

+ // again. We need to schedule another resume.

+ scheduleResumeTopActivities();

+ }

}

final int startActivityMayWait(IApplicationThread caller, int callingUid,