Lauchmode of activity in Android (load mode)

1.standard mode: A task has multiple activity, one activity can be instantiated multiple times, and can be placed in a different task.

2.singleTop mode: The activity is at the top of the stack and receives a intent message that initiates the activity, which no longer creates an instance. Call the top instance of the stack directly. For example: Activitya start Activityb, there is a timer in a for 10 seconds to start Activityb.

3.singleTask has only one instance, to be called must destroy the instance of the other top-of-stack element.

From the above, only a can call B, and a call B again when the c,d must be destroyed, so that B is at the top of the stack.

4.singleInstance creates a new task when an activity is created, only itself, and calls other activity in other tasks.

Lauchmode of activity in Android (load mode)