@Override
protected Void doInBackground(String... params) {
    answer = "Вернулся " + params[0];
    do {
        try {
            Thread.sleep(5000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        System.gc();
        try {
            WeakCallback.get().getResult(answer);
        } catch (Exception e) {
            e.printStackTrace();
            Log.d(LOG_TAG,"активити пересоздан");
            break;
        }
    } while (x > 1);

    return null;
}