调用finish（）后，ActivityGroup的子活动未完成

Question

I have a program using ActivityGroup. The class structure is as below:

Class A extends ActivityGroup {
onCreate(){
}
}

Class B extends A {
onCreate() {
startActivityResult();//launch C
}

onActivityResult(){
...
finish();//finish activity after receive result from C;this line of code does execute in test
...
}
}

Class C extends A {
onCreate(){
...
}
}

B is the entrance for the overall program. In B's onCreate() , I use startActivityResult() to launch C; in C, it will show user a button; after user clicks the button, C will call finish() and setResult(); then in B's onActivityResult() , I try use the method finish() to exit all of the application.

The problem is that the screen turns into black after press the button. Then I use hierarchyviewer.bat too see the views; to my suprise, there are a view with id R.id.content and another root view without id. And the tools show that the activity B is on the top. I know the view with id R.id.content is the root view of an Activity .But I don't know why it is still there after finish() is called. You know, there is no other logic after finish() and no other receiver there, or any other can block to finish.

Maybe it is an issue about my wrong use of ActivityGroup . Can anyone help?

Thanks for your answers for my first question on stackoverflow.

Answer 1

我知道根本原因，这是因为我使用了B的singleTask活动，但其他一些活动却作为新任务启动，但仍未完成。