我的ListView填充正确，但由于某种原因，添加和删除是古怪而不能正常工作！难道我做错了什么？

设置的东西在OnCreate中（）

 的ListView =（ListView控件）findViewById（R.id.ListView）;

        registerForContextMenu（ListView控件）;

        deserializeQuotes（）;

        如果（行情== NULL || quotes.size（）== 0）{
            报价=新的ArrayList＆LT;报价＆GT;（）;
            // populateDefaultQuotes（）;
            // serializeQuotes（）;
            // getQuotesFromYQL（）;
        }

        this.quotesAdapter =新QuoteAdapter（这一点，R.layout.mainrow，行情）;
        listView.setAdapter（this.quotesAdapter）;

        listView.setOnItemClickListener（新OnItemClickListener（）{
            @覆盖
            公共无效onItemClick（适配器视图＆LT;＆gt;一种，视图V，INT位置，长的id）{
                deserializeQuotes（）;
                报价myQuote = quotes.get（位置）;
                吐司面包= Toast.makeText（getApplicationContext（），myQuote.getName（），Toast.LENGTH_SHORT）;
                toast.show（）;
            }
        }）;
 

报价适配器专用类

 私有类QuoteAdapter扩展ArrayAdapter＆LT;报价＆GT; {

        私人的ArrayList＆LT;报价＆GT;项目;

        公共QuoteAdapter（上下文的背景下，INT textViewResourceId，
                ArrayList的＆LT;报价＆GT;项目）{
            超（背景下，textViewResourceId，项目）;
            this.items =项目;
        }

        @覆盖
        公共查看getView（INT位置，查看convertView，ViewGroup中父）{
            视图V = convertView;
            如果（V == NULL）{
                LayoutInflater VI =（LayoutInflater）getSystemService（Context.LAYOUT_INFLATER_SERVICE）;
                V = vi.inflate（R.layout.mainrow，NULL）;
            }
            报价Q = items.get（位置）;
            如果（Q！= NULL）{
                TextView的nameText =（TextView中）v.findViewById（R.id.nameText）;
                TextView的priceText =（TextView中）v.findViewById（R.id.priceText）;
                TextView的changeText =（TextView中）v.findViewById（R.id.changeText）;

                如果（nameText！= NULL）{
                    nameText.setText（q.getSymbol（））;
                }
                如果（priceText！= NULL）{
                    priceText.setText（q.getLastTradePriceOnly（））;
                }
                如果（changeText！= NULL）{
                    changeText.setText（q.getChange（））;
                }
            }
            返回伏;
        }
    }
 

从列表中删除的项目（这不工作，不执行任何操作）

  @覆盖
    公共布尔onContextItemSelected（菜单项项）{
        如果（item.getTitle（）==删除）{
            deserializeQuotes（）;
            AdapterContextMenuInfo信息=（AdapterContextMenuInfo）item.getMenuInfo（）;
            quotesAdapter.remove（quotes.get（info.position））;
            quotesAdapter.notifyDataSetChanged（）;
            serializeQuotes（）;
        }
        其他 {
            返回false;
        }

        返回true;
    }
 

将项目添加到列表中（这工作）

 保护无效onActivityResult（INT申请code，INT结果code，意图数据）{
    如果（结果code == RESULT_OK）{
        deserializeQuotes（）;
        this.quotesAdapter =新QuoteAdapter（这一点，R.layout.mainrow，行情）;
        quotesAdapter.notifyDataSetChanged（）;
        listView.setAdapter（quotesAdapter）;
    }
}
 

下面是我如何序列化和反序列化

 私人无效serializeQuotes（）{
        FileOutputStream中FOS;
        尝试 {
            FOS = openFileOutput（Constants.FILENAME，Context.MODE_PRIVATE）;
            ObjectOutputStream的OOS =新的ObjectOutputStream（FOS）;
            oos.writeObject（引号）;
            oos.close（）;
        }赶上（FileNotFoundException异常E）{
            e.printStackTrace（）;
        }赶上（IOException异常E）{
            e.printStackTrace（）;
        }
    }

    @燮pressWarnings（未登记）
    私人无效deserializeQuotes（）{
        尝试{
            的FileInputStream FIS = openFileInput（Constants.FILENAME）;
            ObjectInputStream的OIS =新的ObjectInputStream（FIS）;
            报价=（ArrayList的＆LT;报价＆GT;）ois.readObject（）;
        }赶上（FileNotFoundException异常E）{
            e.printStackTrace（）;
        }赶上（IOException异常E）{
            e.printStackTrace（）;
        }赶上（ClassNotFoundException异常E）{
            e.printStackTrace（）;
        }
    }
 

解决方案

在code似乎是正常的。你可以尝试在你删除使用这样的：

 如果（删除.equals（item.getTitle（）））{
   // ....
}
 

编辑：

我只注意到通过调用 deserializeQuotes你反序列化报价对象（）。你是否覆盖了布尔等于（对象）引用对象的方法？当你反序列化，创建的对象不是相同，也就是说，它们是新的对象完全，如果你有没有覆盖equals方法：

  quotesAdapter.remove（quotes.get（info.position））;
 

会失败，因为它找不到任何引用的对象列表中删除。

您可以检查？

My ListView populates correctly, but for some reason adding and removing is quirky and does not work properly! Am I doing something wrong?

Set things up in OnCreate()

listView = (ListView) findViewById(R.id.ListView);

        registerForContextMenu(listView); 

        deserializeQuotes();

        if(quotes == null || quotes.size() == 0){
            quotes = new ArrayList<Quote>();
            //populateDefaultQuotes();
            //serializeQuotes();
            //getQuotesFromYQL();
        }

        this.quotesAdapter = new QuoteAdapter(this, R.layout.mainrow, quotes);
        listView.setAdapter(this.quotesAdapter);

        listView.setOnItemClickListener(new OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> a, View v, int position, long id) {
                deserializeQuotes();
                Quote myQuote = quotes.get(position);
                Toast toast = Toast.makeText(getApplicationContext(), myQuote.getName(), Toast.LENGTH_SHORT);
                toast.show();
            }
        });

Quote Adapter Private Class

private class QuoteAdapter extends ArrayAdapter<Quote> {

        private ArrayList<Quote> items;

        public QuoteAdapter(Context context, int textViewResourceId,
                ArrayList<Quote> items) {
            super(context, textViewResourceId, items);
            this.items = items;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            View v = convertView;
            if (v == null) {
                LayoutInflater vi = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                v = vi.inflate(R.layout.mainrow, null);
            }
            Quote q = items.get(position);
            if (q != null) {
                TextView nameText = (TextView) v.findViewById(R.id.nameText);
                TextView priceText = (TextView) v.findViewById(R.id.priceText);
                TextView changeText = (TextView) v.findViewById(R.id.changeText);

                if (nameText != null) {
                    nameText.setText(q.getSymbol());
                }
                if (priceText != null) {
                    priceText.setText(q.getLastTradePriceOnly());
                }
                if (changeText != null) {
                    changeText.setText(q.getChange());
                }
            }
            return v;
        }
    }

Remove an item from the list (THIS DOESNT WORK, DOES NOTHING)

@Override  
    public boolean onContextItemSelected(MenuItem item) {  
        if(item.getTitle()=="Remove"){
            deserializeQuotes();
            AdapterContextMenuInfo info = (AdapterContextMenuInfo) item.getMenuInfo();
            quotesAdapter.remove(quotes.get(info.position));
            quotesAdapter.notifyDataSetChanged();
            serializeQuotes();
        }  
        else {
            return false;
        }  

        return true;  
    }  

Add an item to the list (THIS WORKS)

 protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (resultCode == RESULT_OK) {
        deserializeQuotes();
        this.quotesAdapter = new QuoteAdapter(this, R.layout.mainrow, quotes);      
        quotesAdapter.notifyDataSetChanged();
        listView.setAdapter(quotesAdapter);
    }
}

Here is how I serialize and deserialize

private void serializeQuotes(){
        FileOutputStream fos;
        try {
            fos = openFileOutput(Constants.FILENAME, Context.MODE_PRIVATE);
            ObjectOutputStream oos = new ObjectOutputStream(fos);
            oos.writeObject(quotes); 
            oos.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }catch(IOException e){
            e.printStackTrace();
        }
    }

    @SuppressWarnings("unchecked")
    private void deserializeQuotes(){
        try{
            FileInputStream fis = openFileInput(Constants.FILENAME);
            ObjectInputStream ois = new ObjectInputStream(fis);
            quotes = (ArrayList<Quote>) ois.readObject();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }catch(IOException e){
            e.printStackTrace();
        }catch(ClassNotFoundException e){
            e.printStackTrace();
        }
    }

The code seems to be alright. Can you try using this in your remove?:

if("Remove".equals(item.getTitle())) {
   //....
}

Edit:

I just noticed you are de-serializing "Quote" objects by calling deserializeQuotes(). Have you overridden the boolean equals(Object) method of Quote object? When you de-serialize, the object created are not the "same", i.e. they are new objects altogether and if you haven't overridden the equals method:

quotesAdapter.remove(quotes.get(info.position));

will fail because it won't find any Quote object to remove in the list.

Can you check that?