Question

In my main activity, I have:

    Intent settings_intent = new Intent(this, SettingsActivity.class);
    settings_intent.putExtra("SomeID", some_int);
    startActivityForResult(settings_intent, 1);

And then, in my SettingsActivity, I have:

@Override
public void onBackPressed() {
    super.onBackPressed();
    // pass back settings:
    Intent data = new Intent();
    data.putExtra("SomeThing", some_number);
    setResult(200, data);
    finish();
}

And finally, I overrode the following in my Main activity:

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    makeToast("called");
    super.onActivityResult(requestCode, resultCode, data);
}

However, the “called” toast happens as soon as my “Settings” activity starts, instead of when it finishes. I’ve spent quite a while on this now. Any help is appreciated. Thanks.

Answer 1

Most likely your settings activity has it’s launch mode set to singleTask in your manifest. This leads to a immediate cancel response when calling startActivityForResult().

Note that this method should only be used with Intent protocols that
are defined to return a result. In other protocols (such as
ACTION_MAIN or 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.

from the startActivityForResult() documentation