奇怪的LiveData行为?

我正在尝试使用ViewModel和LiveData实现MVVM体系结构。这两种方法位于活动中:

 private void handleResult(BoardViewModel vm) {
        vm.getLiveDataSingleObj("Result").observe(this, new Observer<Object>() {
            @Override
            public void onChanged(@Nullable Object resultObj) {
                Result result = (Result) resultObj;
                if (!result.isCompleted()) return;
                gotoResult();
            }
        });
    }

和

private void gotoResult() {
        Log.w(LOG_TAG, "Result: Moving to next activity");
        Intent intent = new Intent(boardActivity, ResultActivity.class);
        intent.putExtra("LEVEL", levelIndex);
        intent.putExtra("MAP", mapIndex);
        startActivity(intent);
    }

handleResult方法被设置为侦听指示游戏已结束的结果对象,现在是进入下一个活动(“gotoResult”)的时候了。然而,这完全破坏了应用程序的导航,当我返回并说尝试开始一个新的游戏会话时,我会立即转到下一个活动,告诉我我已经赢了。

任何关于它为何多次触发并最终停止的想法,让我开始一个新的会话。要澄清的是,如果我每次都删除gotoResult,那么逻辑就会工作,没有索引越界的错误,或者你有什么错误,只有当我添加goto时,一切才会中断。

视图模型:

private void setupHashTypes() {
        hashLiveData.put(KEY_BOARD, liveDataBoardQuery);
        hashLiveData.put(KEY_STEPS_COUNTER, game.getStepsTakenLiveData());
        hashLiveData.put(KEY_PATH_CHANGE, game.getPathChangedLiveData());
        hashLiveData.put(KEY_VALUE_CHANGE, game.getValueChangeLiveData());
        hashLiveData.put(KEY_TIMER, game.getTimerLiveData());
        hashLiveData.put(KEY_SELECTED, game.getSelectedLiveData());
        hashLiveData.put(KEY_DESELECTED, game.getDeselectedLiveData());
        hashLiveData.put(KEY_HOLD, game.getHoldLiveData());
        hashLiveData.put(KEY_UNHOLD, game.getUnholdLiveData());
        hashLiveData.put(KEY_RESULT, game.getResultLiveData());
    }

    public LiveData<Object> getLiveDataSingleObj(String type) {
        if (hashLiveData.containsKey(type)) {
            return (LiveData<Object>) hashLiveData.get(type);
        }
        throw new IllegalArgumentException("Invalid: key was not found: " + type);
    }

该模型具有getter,例如:

  private final SingleLiveEvent<Result> resultLiveData = new SingleLiveEvent<>();
    public LiveData<Result> getResultLiveData() {
        return resultLiveData;
    }