Android Note 3.4 Activity startup mode on Android

Course Background:
There are four startup modes in Android, each of which represents a use case, with in-depth knowledge of the four startup modes to be able to write the perfect program in the actual development work.

Core content:
1.Activity Standard start Mode
2.Activity singletop Boot Mode
3.Activity singletask Boot Mode
4.Activity singleinstance Boot Mode

Configure how each activity is started in Androidmanifest.xml:

1.Activity Standard start Mode

Standard, default startup mode, same task stack, always create new instances, first in and out.

All activity is in a stack, each activity can have multiple instances, for example: A,b,c,b,a,b,a ...

2.Activity singletop Boot Mode

There can only be one instance of the activity at the top, such as the sequential a,b,c of the

First, if you start C again, it will be completely unchanged.

Second, if re-start B, that is: a,b,c,b

3.Activity singletask Boot Mode

Only one of each activity can exist, such as the sequential a,b,c of a stack,

First, if you start a again, the c,b pops up. The remaining a (that is, any instance can not be repeated, will pop up the upper instance after the top)

Second, if you start C again, it will be completely unchanged.

4.Activity singleinstance Boot Mode

All instances have a single stack that is switched between each other.

Android Note 3.4 Activity startup mode on Android