更改其他活动的活动标签（操作栏标题）？

Question

我想知道是否有一种方法可以将一个活动标签从另一个活动更改？

Answer 1

您可以使用setTitle（）方法更改操作栏的标题：

setTitle("awsome");

Answer 2

You are only able to access one Activity instance at a time (visible one) so you can not call setTitle on invisable Activity directly.

The solution is you need to have Global variable to store the Activity title ( can use Static variable or Application field). When button click - you update Global variable. When Activity onResume, you set title in Global variable to the Activity by calling setTitle.

Answer 3

Use an EventBus like: https://github.com/greenrobot/EventBus

Well use EventBus everywhere! EventBus is a very powerful concept!

An alternative would be to startActivityForResult() and the other one will return the new ActionBarTitle as result, but EventBus is definitely better!