setResult does not work when BACK button pressed

Question

I am trying to setResult after the BACK button was pressed. I call in onDestroy

Intent data = new Intent();
setResult(RESULT_OK, data) 

But

Answer 1

i paste the answer may be will be helpful to other people: when a set launcheMode with android:launchMode="singleTask" i also cant get the result, the doc says:

     /* 
Note that this method should only be used with Intent protocols
 * that are defined to return a result.  In other protocols (such as
 * {@link Intent#ACTION_MAIN} or {@link Intent#ACTION_VIEW}), you may
 * not get the result when you expect.  For example, if the activity you
 * are launching uses the singleTask launch mode, it will not run in your
 * task and thus you will immediately receive a cancel result.
 */

and:

     /* 
As a special case, if you call startActivityForResult() with a requestCode 
 * >= 0 during the initial onCreate(Bundle savedInstanceState)/onResume() of your
 * activity, then your window will not be displayed until a result is 
 * returned back from the started activity.  This is to avoid visible 
 * flickering when redirecting to another activity. 
 */