CODEWITHSUNDEEP
android
Ankit Srivastava
Ankit Srivastava

Reputation: 364

Overriding onBack Pressed?

Correct me if i am wrong "moveTaskToBack(false/true);" has nothing to do with the visibility of the Activity ,but has everything to do with Activity Stack,because many times on stackoverflow i find people being confused on this.

Now My Scenario: there are two activites A and B A is the root Activity B is launched from activity A

the thing is i don't want my activity B to be killed after the back button is pressed,(just i want it to be invisible,and activity A to be visible which will happen on its own )so that i can restore its state afterwards.

so after searching a bit i came to know about moveTaskToBack(false);, which seemed to be the solution as it does not kill the activity (because the activity is not sent to back in the activity stack),but the only problem is.it works with Root Activity,and hence it will not work in my case.So is there any alternative which i can use with"non-root" activities,so that the state of Activity is restored....

Upvotes: 2

Views: 259

Answers (1)

Raghunandan
Raghunandan

Reputation: 133560

I guess you have misunderstood

public boolean moveTaskToBack (boolean nonRoot)

Added in API level 1

Move the task containing this activity to the back of the activity stack. The activity's order within the task is unchanged.

Parameters

nonRoot If false then this only works if the activity is the root of a task; if true it will work for any activity in a task.

Returns

If the task was moved (or it was already at the back) true is returned, else false.

Back Button by default takes you back to the previous activity. It pop's the activity from the back stack and the previous activity in the stack takes focus.

Save the state of the activity in onPause restore it in onCreate or onResume. To store values persistently chekc the below link for storage options.

http://developer.android.com/guide/topics/data/data-storage.html

http://developer.android.com/guide/components/tasks-and-back-stack.html

You may want to check the answer by commonsware in the below link.

https://groups.google.com/forum/#!topic/android-developers/4Pz6LrzVpx0

Upvotes: 1

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