AutoCompleteTextView不更新arrayadapter项目 [英] AutoCompleteTextView doesn't update arrayadapter items

问题描述

下面的程序流程显示了我的预期（阿尔法中的自动完成列表）：

The following App flow shows what I expected ("Alfa" in the autocomplete list):

打开应用程序 - >点击按钮 - >自动完成对自来水领域 - >键入人

Open App -> click on button -> tap on autocomplete field -> type "al"

但是这一次失败（如果I型BR，布拉沃仍然是在列表中）：

But this one fails (and if I type "br", "Bravo" is still in the list):

打开应用程序 - >水龙头上自动完成场 - >输入任何东西，然后将其删除 - >点击按钮 - >自动完成对自来水领域 - >键入人

Open App -> tap on autocomplete field -> type anything and then delete it -> click on button -> tap on autocomplete field -> type "al"

为什么没有在第二顺序更新列表？

Why the list is not updated in the second sequence?

public class DisplayFragment extends Fragment {

 AutoCompleteTextView autoCTVShop;
 Button buttonSend;

 String[] names= {"Bravo","Charlie","Delta","Foxtrot"};
 ArrayAdapter<String> adapter;

 @Override
 public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {            
    return inflater.inflate(R.layout.fragment_display, container, false);
 }

 @Override
 public void onActivityCreated(Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);

    autoCTVShop = (AutoCompleteTextView) getActivity().findViewById(R.id.autoCompleteTextViewShop);
    adapter = new ArrayAdapter<String>(getActivity().getApplicationContext(),
            android.R.layout.simple_list_item_1, names);
    autoCTVShop.setAdapter(adapter);
    buttonSend = (Button) getActivity().findViewById(R.id.buttonSend);
    buttonSend.setOnClickListener(new View.OnClickListener() {  

        @Override
        public void onClick(View v) {
            //The following two lines don't work as I expected
            names[0]="Alfa";
            adapter.notifyDataSetChanged();
        }
    }); 
 }


 @Override
 public void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
 }
}  

fragment_display.xml：

fragment_display.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   android:orientation="vertical" >

<AutoCompleteTextView
    android:id="@+id/autoCompleteTextViewShop"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:ems="10"
    android:imeOptions="actionNext"
    android:singleLine="true" />

<Button
    android:id="@+id/buttonSend"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:clickable="true"
    android:enabled="true"
    android:text="Button" />

</LinearLayout>  

感谢。

推荐答案

在内部， ArrayAdapter 使用2列出来存储和处理的项目。开始时，您的项目中通过存储，并通过一个名为列表处理 mObjects 。任何更改您的外名称对象将反映在 mObjects 列表也是如此。

Internally the ArrayAdapter uses 2 lists to store and handle the items. Initially your passed in items are stored and handled through a list named mObjects. Any changes to your outside names object would be reflected in the mObjects list as well.

一旦你开始过滤，第二个名单，名为 mOriginalValues​​ 创建。在过滤流量， mObjects 将被用作当前值的容器，而 mOriginalValues​​ 作为复位并重新过滤器容器。更改名称值将没有影响了。您可以直接更改适配器值（adapter.insert（...），adapter.remove（...） - 它会修改 mOriginalValues​​ ）或重新创建适配器

As soon as you start filtering, a second list, named mOriginalValues is created. During the filtering flow, mObjects is going to be used as the "current values" container, while mOriginalValues is used as a "reset to and re-filter" container. Changing the names values will have no influence anymore. You could change the adapter values directly (adapter.insert(...), adapter.remove(...) - it will modify mOriginalValues) or recreate the adapter

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