明确任务的所有活动？ [英] Clear all activities in a task?

问题描述

我有一个闪屏的活动，然后登录活动。我的历史堆栈是这样的：

I have a splash screen activity, then a login activity. My history stack looks like:

SplashActivity
LoginActivity

当用户通过LoginActivity成功登录，我要开始WelcomeActivity，但清除整个堆栈：

when the user successfully logs in via LoginActivity, I want to start WelcomeActivity, but clear the entire stack:

SplashActivity
LoginActivity // launches WelcomeActivity ->
WelcomeActivity

// but now all three are in the history stack, while I only
// want WelcomeActivity in the stack at this point.

有一些标志，我可以用它来做到这一点？

Is there some flag I can use to do that?

// LoginActivity.java
Intent intent = new Intent(this, WelcomeActivity.class);
intent.addFlag(Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(intent);
finish();

不知道是否使用FLAG_ACTIVITY_CLEAR_TASK将清除所有活动我的任务或没有。我可以通过使用startActivityForResult（）调用展开堆栈这种手动操作，但会更脆弱，更code来维持。

Not sure if using the FLAG_ACTIVITY_CLEAR_TASK will clear out all activities in my task or not. I can do this 'manually' by unwinding the stack by using startActivityForResult() calls, but will be more fragile and more code to maintain.

感谢

推荐答案

是的，这应该能正常运行。你可以使用：

Yes that should work fine. You could use:

• FLAG_ACTIVITY_CLEAR_TOP
• FLAG_ACTIVITY_SINGLE_TOP
• FLAG_ACTIVITY_CLEAR_TASK
• FLAG_ACTIVITY_NEW_TASK

• FLAG_ACTIVITY_CLEAR_TOP
• FLAG_ACTIVITY_SINGLE_TOP
• FLAG_ACTIVITY_CLEAR_TASK
• FLAG_ACTIVITY_NEW_TASK

这确保了一个实例是已在运行，而不是顶部，然后在上面的任何东西，将被清除，它会被使用，而不是开始一个新的实例（这个有用的，一旦你已经走了欢迎活动 - >活动A，然后你想回到从A到欢迎，但额外的标志应该不会影响你的案件以上）。

which ensures that if an instance is already running and is not top then anything on top of it will be cleared and it will be used, instead of starting a new instance (this useful once you've gone Welcome activity -> Activity A and then you want to get back to Welcome from A, but the extra flags shouldn't affect your case above).

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