Exclude current activity from Recent Tasks

My app, running in background, at some point displays activity to purposefully interrupt user's flow. My activity starts a new task, which appears in "Recent Tasks" lists while being in foreground. Is there any way it could be prevented? Setting android:excludeFromRecents does not work - activity is not presented anymore in "Recent Tasks" only after is has been paused.

Manifest looks like:

<activity
    android:name="com.example.recenttasks.MainActivity"
    android:excludeFromRecents="true">
</activity>

and activity is started this way:

@Override
public void onReceive(Context context, Intent intent) {
    Intent i = new Intent(context, MainActivity.class);
    i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    context.startActivity(i);
}