本文详细解释了Android中Activity栈的运作方式，包括界面焦点、用户焦点和Activity启动模式等核心概念，帮助开发者理解如何在不同Activity间进行有效管理。
界面焦点和用户焦点
When the current activity starts another, the new activity is pushed on the top of the stack and takes focus.
Activity栈："last in, first out"
When all activities are removed from the stack, the task no longer exists.
a new instance of that activity and activity instance.
In this regard, the principal <activity> attributes you can use are:
And the principal intent flags you can use are:
Activity启动模式： standard，singleTop，singleTask，singleInstance
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