管理活动 - Android

Question

I have a problem with maintaining the activities.

I have activity A, and when starting Activity B from Notification, I should end Activity A, and start Activity B.

In other words, At a same time, in stack, Only Activity A or Activity B should be present. Its' very easy achieve when am starting Activity B from Activity A, by calling finish() in Activity A. But cannot achieve the same when starting activity from notification.

Stack should be like this,

• MainActivity -- Activity A
• MainActivity -- Activity B (When starting activity B from notification)

But My Stack looks like,

• MainActivity -- Activity A -- Activity B

What Intent flags or launch mode should be used for this.

Answer 1

ClearTaskOnLaunch

If this attribute is set to "true" in the root activity of a task, the stack is cleared down to the root activity whenever the user leaves the task and returns to it.

Answer 2

使用您的通知将PendingIntent发送到 Activity A，在onNewIntent()处理它并让它启动 Activity B，按照您的描述完成 Activity A。

Answer 3

why don't you call finish() in onStop() of both activities,

in this manner you will always have one activity On, down side of it as soon as you go somewhere apart from these activity they will be closed and you will loss that data,

looking as your current requirement I think only one Activity should live so this might solve your problem

Answer 4

You could try setting

android:launchMode="singleTask"

in your manifest where you declare your activites.

See documentation of launch modes .