java - 如何在没有实际完成的情况下关闭活动？

Question

我想要：

open 1, 2, 3 activities
1 > 2 > 3  

back to #2
1 > 2

open #4 activity
1 > 2 > 4

back to #2
1 > 2

restore #3 activity
1 > 2 > 3

“恢复”是指打开以前关闭的活动而不重新创建。我怎样才能做到这一点？

谢谢！

Answer 1

open 1, 2, 3 activities
1 > 2 > 3  

back to #2
1 > 2          // call startActivity for 2, don't call finish() in 3

open #4 activity
1 > 2 > 4

back to #2
1 > 2

restore #3 activity
1 > 2 > 3      // call startActivity for 3 with intent as Intent.setFlags(Intent.FLAG_ACTIVITY_REORDER_To_FRONT);