setResult does not work when BACK button pressed
I am trying to setResult after the BACK button was pressed. I call in onDestroy
Intent data = new Intent();
setResult(RESULT_OK, data)
But when it comes to
onActivityResult(int requestCode, int resultCode, Intent data)
the resultCode is 0 (RESULT_CANCELED) and data is 'null'.
So, how can I pass result from activity terminated by BACK button?
您需要覆盖onBackPressed（）方法并在调用超类之前设置结果，即
@Override
public void onBackPressed() {
Bundle bundle = new Bundle();
bundle.putString(FIELD_A, mA.getText().toString());
Intent mIntent = new Intent();
mIntent.putExtras(bundle);
setResult(RESULT_OK, mIntent);
super.onBackPressed();
}
Activity result must be set before finish() is called. Clicking BACK actually calls finish() on your activity , so you can use the following snippet:
@Override
public void finish() {
Intent data = new Intent();
setResult(RESULT_OK, data);
super.finish();
}
If you call NavUtils.navigateUpFromSameTask(); in onOptionsItemSelected() , finish() is called, but you will get the wrong result code . So you have to call finish() not navigateUpFromSameTask in onOptionsItemSelected() . wrong requestCode in onActivityResult
如果你想在onBackPressed事件中设置一些自定义的RESULT_CODE ，那么你需要先设置result ，然后调用super.onBackPressed()并且你将在调用者活动的onActivityResult方法中收到相同的RESULT_CODE
@Override
public void onBackPressed()
{
setResult(SOME_INTEGER);
super.onBackPressed();
}
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