(Android review) Task Stack and Startup Mode

(Android review) Task Stack and Startup Mode

This knowledge point is mainly understood as follows:

I. task stack)

1. function: it is used to manage the activity entry and exit. Records user behaviors.

2. Example:

Perform the following operations:

At this time, the activity in the task stack is as follows:

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2. Category:

Standard: Click an activity to create an activity.

SingleTop: if the activity to be started is already on the top of the stack, no new activity will be created.

SingleTask: if the activity to be started is already in the task stack, it will find the activity and
All the above activities are cleared and then reused.

SingleInstance: This activity occupies a separate job stack. When you start such an activity
The reference of this activity will cut off the previous reference

3. Example:

Note: Use A to represent MainActivity, and use B to represent Main2Activity.

1) if you perform operations A ----> B --->,

In this case, the result in the job stack corresponding to standard and singleTop is:

2) if A ------> B --------> A ------> B,

The job stacks corresponding to singleTask and singleInstance are as follows: