如何解决"适配器的内容已更改但ListView未收到通知"异常

Question

我在同一主题上发现了很多问题.但我无法弄清楚我在这里做错了什么.

例外:"适配器的内容已更改,但ListView未收到通知.请确保未从后台线程修改适配器的内容,但只能从UI线程修改"

我有一个TextWatcher到我的AutoCompleteTextView.我试图在文本更改时更新下拉列表.我从两个不同的来源获取下拉列表的数据.并且每个人都在不同的线程内运行.

mTextWatcher = new TextWatcher() {
        public void afterTextChanged(Editable editable) {           
        }

        public void beforeTextChanged(CharSequence s, int start, int count,
                int after) {
        }

        public void onTextChanged(CharSequence s, int start, int before,
                int count) {
            suggestionNewText = s.toString();
            list = new ArrayList<Map<String, String>>();
            runOnUiThread(new Runnable() {
                @Override
                public void run() {
                     //data processing
                     list.add(data);
                     handler.sendEmptyMessage(1);
                            }
                        });

            Thread webAutoComplete = new Thread(new Runnable() {
                       @Override
                       public void run() {
                              //data process
                              list.add(data);
                              handler.sendEmptyMessage(1);
            }
            });

            try {
                     webAutoComplete.start();
                } catch (NullPointerException e) {
                } catch (IllegalStateException e) {
             }                      
        }
    };

适配器的处理程序位于textwatcher旁边.

    handler = new Handler() {

        @Override
        public void handleMessage(Message msg) {
            switch (msg.what) {
            case 1: {

                ((Activity) CONTEXT).runOnUiThread(new Runnable() {
                    public void run() {
                        try {
                            if (list != null)

                            suggestionAdapter = new UrlSuggestionAdapter(
                                    CONTEXT,
                                    list,
                                    R.layout.two_line_autocomplete,
                                    new String[] { "title", "url" },
                                    new int[] { R.id.title, R.id.url
                                             });
                            if (list != null) {
                                refreshAdapter(list);
                                getUrl.setAdapter(suggestionAdapter);

                            }

                        } catch (Exception e) {

                        }
                    }
                });
                break;
            }
            case 2: {
                break;
            }
            }
        }
    };



public synchronized void refreshAdapter(List<Map<String, String>> items) {

    list = items;
    if (list != null) {

        suggestionAdapter.notifyDataSetChanged();
    }
}

上面的整个代码都在Activity的OnCreate()方法中.我总是不会得到例外.它发生在特定场合.此问题尚未解决.我在创建适配器后添加了notifydatasetchanged()方法.仍然没有解决问题.谁能指出我在这里做错了什么？

Answer 1

通过添加修复错误

suggestionAdapter.notifyDataSetChanged();

每当列表更改时打开，而不是在多次插入后调用它。