Android - ListView多选只选择2项

Question

在激活i'm only able to select 2 items到ListView之后，有人知道Multiple Choice的原因。

listView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
            @Override
            public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
                //Activate CHOICE_MODE_MULTIPLE
                multipleActivated = true;
                listView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
                listView.setItemChecked(position, true);
                Log.w("Multiple Selection", "Activated");
                return true;
            }
        });

        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                if (multipleActivated == false) {
                   //Perform normal click and call new intent
                   .....
                } else {
                   //set the clicked item to be checked since the Multiple Selection is activated
                    listView.setItemChecked(position, true);
                    Log.w("Selection", String.valueOf(position));
                }
            }
        });

正如你在我的代码中看到的那样，我只想在LongPress执行后激活Multiple Choice Mode，这个确定并且工作正常，但是我可以选择2个项目，在第3个选择第一个选择的项目只是取消选择。我不知道为什么。有人可以帮我吗？谢谢！