android - 搜索列表视图？

Question

Android是否可以为ListView设置搜索栏,以便在触摸搜索栏时弹出键盘,当在搜索栏中输入文本时,会显示ListView中匹配的项目？

我真正需要的是带有键盘的搜索栏.

更新:

我添加了EditText字段,它会调出一个键盘,我可以输入EditText字段.我想要的是让ListView中显示的列表中项目的前几个字符与EditText窗口中输入的字符相匹配.

我试过按照ListView Filter中列出的方法尝试,但是我对ListView中已经完成了多少过滤有点困惑？

1)我是否需要创建一个单独的数组来存储与EditText中键入的文本相匹配的值？从这篇文章调用adapter.notifyDataSetChanged,看来ListView已经有一个shadow数组来执行此操作,并在adapter.notifyDataSetChanged(); 叫做.

2)我是否需要调用adapter.notifyDataSetChanged(); 在EditText窗口中键入一些文本后更新ListView？

3)我是否需要扩展ListActivity,如此帖所示？如果是这样,如果活动类已经从主活动扩展,我该如何扩展我的活动类？

4)我目前拥有以下内容:

ArrayAdapter<String> adapter = null;
private EditText filterText = null;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.symptom);
    ListView symptomList = (ListView) findViewById(R.id.ListView_Symptom);
    symptomList.setTextFilterEnabled(true);
    symptomList.setFastScrollEnabled(true);
    filterText = (EditText) findViewById(R.id.search_box);
    filterText.addTextChangedListener(filterTextWatcher);

    adapter = new ArrayAdapter<String>(this, R.layout.menu_item, symptomsArray);
    symptomList.setAdapter(adapter);

    private TextWatcher filterTextWatcher = new TextWatcher() {

        public void afterTextChanged(Editable s) {
        }

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

        public void onTextChanged(CharSequence s, int start, int before,
                int count) {
            adapter.getFilter().filter(s);
            adapter.notifyDataSetChanged();
        }

    };

不幸的是,当我输入EditText框时,我得到一个NullPointer异常

 Thread [<7> Filter] (Suspended (exception NullPointerException))   
ArrayAdapter$ArrayFilter.performFiltering(CharSequence) line: 437   
Filter$RequestHandler.handleMessage(Message) line: 234  
Filter$RequestHandler(Handler).dispatchMessage(Message) line: 99    
Looper.loop() line: 123 
HandlerThread.run() line: 60    

知道我错过了什么吗？

Answer 1

您犯了一个非常小的错误: - 在设置文本之前创建数组适配器更改侦听器到编辑文本

看到更正的代码

public class SearchListView extends Activity
{


/** Called when the activity is first created. */

private ListView lv1;
private String lv_arr[] =
{ "Android", "iPhone", "BlackBerry", "me", "J2ME", "Listview", "ArrayAdapter", "ListItem", "Us", "UK", "India" };
ListView lst;
EditText edt;
ArrayAdapter<String> arrad;



@Override
public void onCreate( Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);


    lv1=(ListView)findViewById(R.id.ListView01);
    edt = (EditText) findViewById(R.id.EditText01);

     arrad =  new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1 , lv_arr);
     lv1.setAdapter(arrad);

    // By using setTextFilterEnabled method in listview we can filter the listview items.

     lv1.setTextFilterEnabled(true);
     edt.addTextChangedListener(new TextWatcher()
    {


        @Override
        public void onTextChanged( CharSequence arg0, int arg1, int arg2, int arg3)
        {
            // TODO Auto-generated method stub

        }



        @Override
        public void beforeTextChanged( CharSequence arg0, int arg1, int arg2, int arg3)
        {
            // TODO Auto-generated method stub

        }



        @Override
        public void afterTextChanged( Editable arg0)
        {
            // TODO Auto-generated method stub
            SearchListView.this.arrad.getFilter().filter(arg0);

        }
    });

}

}