Sunday, 9 July 2017

Android Flags Launch Mode

These flags has been setted programmatically, it can be used depends upon to the situation and it does overrides the behaviour which has defined in the AndroidManifest.xml file.

The following are the list of launch mode flags

FLAG_NEW_TASK
FLAG_CLEAR_TASK
FLAG_SINGLE_TOP
FLAG_CLEAR_TOP



FLAG_NEW_TASK:

Eg 1:
Assume Activity Stack
D
C
B
A

We are starting E from D with flag
Output:
E
-------
D
C
B
A
Note:  A , B , C , D will be in one task and E will be in another task

Eg 2:
Assume Activity Stack
D
C
B
A

We are starting B from D with flag
Output:
B
-------
D
C
B
A
Note:  A , B , C , D will be in one task and and another B will be in another task

FLAG_CLEAR_TASK: It works in conjugation with FLAG_NEW_TASK

Assume Activity Stack
D
C
B
A

We are starting E from D with flag
Output:
E

Note: All other activities will be get destroyed, every time it creates the new instance of the activity. Importantly, even if the activity already exist in the stack, it won't encourage the updating of the same activity with onNewIntent(...)

FLAG_SINGLE_TOP:
This works same as launch mode="singleTop" (Refer this link)

FLAG_CLEAR_TOP: It works similar to the SingleTop Flag, but it has one unique feature of destroying the activities on the top of the stack

Assume Activity Stack
D
C
B
A

We are starting B from D with flag
Output:
B -old instance gets extras data through onNewIntent(Intent intent);
A
Note: All the other activities on top of the B will be destroyed.

Courtesy: Link

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