CODEWITHSUNDEEP
android
Shubhayu
Shubhayu

Reputation: 13562

result not set in onPause() using setResult() when pressing the Back button

I have 2 activities AAA and BBB. I call BBB from AAA using startActivityForResult(Intent, int). After I am done with BBB, I press the Back button to return to AAA. In BBB, I override onPause() and set the result by using setResult(RESULT_OK).

In AAA, I check my result in onActivityResult(int requestCode, int resultCode, Intent data) and I keep getting RESULT_CANCELLED.

After spending sometime on google/stackoverflow, I figured out that if I override onBackPressed() and set the result in it, then it works absolutely fine.

What I fail to understand is that, why is the result not getting set in onPause(), when in fact onPause() gets called after onBackPressed(). I have gone through the activity flows in the Dev docs and I am pretty clear about what has been mentioned there.

Anyone got any ideas about this behavior or could explain it better?

Upvotes: 7

Views: 4783

Answers (3)

Shankar Agarwal
Shankar Agarwal

Reputation: 34765

Most probably the case must be the life cycle methods.

When you press back key in BBB acctivty firstly onPause() is called so you set something in onPause() then this method is followed by onStop() and further follwed by OnDestroy() because the activity is being finished. So now if you set something in onPause() it is being set but as it is followed by onDestroy() the OS may forcly might cancelling the your task as this activity is finished.

Also if you set something in onPause() then if you application looses focus or is minimized the also onPause() is called might be your stabilty of app may lose. So suggested not use onPause(), better to go with either onKeyUp() or onBackPressed().

Upvotes: 0

Shaiful
Shaiful

Reputation: 5673

You should take a look at the onActivityResult reference. http://developer.android.com/reference/android/app/Activity.html#onActivityResult%28int,%20int,%20android.content.Intent%29

Called when an activity you launched exits, giving you the requestCode you started it with, the resultCode it returned, and any additional data from it. The resultCode will be RESULT_CANCELED if the activity explicitly returned that, didn't return any result, or crashed during its operation.

You will receive this call immediately before onResume() when your activity is re-starting.

Call setResult in finish(). Besause onPause() can be called when a new activity is start from BBB.

Upvotes: 5

MikeIsrael
MikeIsrael

Reputation: 2889

I think the issue here might be that onPaused might be called after you have already returned to the previous activity. I saw similar behaviour in other testing. Try adding some Log.d printouts to confirm the order of the onPause call versus the onActivityResult call.

Upvotes: 1

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