让说，有三种活性

A-> B-> C

如果我从C到B回来，我所要做的仅仅是：

在C：

  onBack pressed（）;
 

和B中

 保护无效的onSaveInstanceState（包outState）{
.....
}

如果（savedInstanceState！= NULL）{
.....
}
 

以上code将处理为从C到B但是，如果C到A，我应该怎么做呢？此外，如何处理，如果我想A和C之间的所有活动都destoryed当C到A？谢谢

另外，如何处理，如果我想A和C之间的所有活动都destoryed当C到A？

使用该意图国旗

 意向书我=新的意图（ActivityC.this，ActivityA.class）;
i.setFlags（Intent.FLAG_ACTIVITY_CLEAR_TOP）;
startActivity（ⅰ）;
 

但是，如果C到A，我该怎么办？

此标志将保留所有活动之间的堆栈，但带来的正面

 意向书我=新的意图（ActivityC.this，ActivityA.class）;
i.setFlags（Intent.FLAG_ACTIVITY_REORDER_TO_FRONT）;
startActivity（ⅰ）;
 

在这两种情况下，你会想完成（）在C调用后打电话到 startActivitiy（）如果你想把它删除。

您可以找到所有意图旗的在这里，在文档

Let say there are three activity

A->B->C

If I am returning from C to B , What I have to do is simply:

In C:

            onBackPressed();

And in B

protected void onSaveInstanceState(Bundle outState) {
.....
}

if (savedInstanceState != null) {
.....
}

The above code will handle the case for From C to B. However, what if C to A, what should I do? Also, how to handle if I would like all activities between A and C are destoryed when C to A? Thanks

Also, how to handle if I would like all activities between A and C are destoryed when C to A?

Use this Intent Flag

Intent i = new Intent(ActivityC.this, ActivityA.class);
i.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(i);

However, what if C to A, what should I do?

This flag will keep all Activities in between on the stack but bring A to the front

Intent i = new Intent(ActivityC.this, ActivityA.class);
i.setFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
startActivity(i);

In either case, you will want to call finish() on C after calling startActivitiy() if you want it removed.

You can find all Intent Flags Here in the Docs