Android - EditText作为搜索框不起作用

Question

我想为EditText启用搜索功能。我的要求是这样的： 当某人键入某个字母时，假设用户键入'a'，那么它应该显示所有以'a'开头的单词应该显示为下拉列表。例如，如果我第一次在EditText中输入“copy”，如果再次输入EditText并尝试输入“co”，那么它应该显示下拉列表“copy”，“come”，“cow”。 ... 我想启用此功能到我的EditText视图。它工作时，我有一个ListView里面只有一个textview，但现在我有两个textview在我的ListView它不起作用。

这是我的活动：

public class sedactivity extends Activity { 


ListView lview; 
ListViewAdapter lviewAdapter; 
EditText ed; 

private static final String first[] = { 
    "America", 
    "Busta", 
    "Cactus", 
    "Fire", 
    "Garden", 
    "Hollywood", 
    "King",}; 

private static final String second[] = { 
    "Uniti", 
    "Chiusa", 
    "Verde", 
    "Fiamme", 
    "Aperto", 
    "Boulevard", 
    "Kong",}; 

private ArrayList<String> arr_sort= new ArrayList<String>(); 
int textlength=0; 

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

    ed = (EditText)findViewById(R.id.EditText1); 
    lview = (ListView) findViewById(R.id.listView2); 
    lviewAdapter = new ListViewAdapter(this, first, second); 


    System.out.println("adapter => "+lviewAdapter.getCount()); 

    lview.setAdapter(lviewAdapter); 

    lview.setTextFilterEnabled(true); 



    ed.addTextChangedListener(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) { 
      textlength=ed.getText().length(); 
      arr_sort.clear(); 
      for(int i=0;i<first.length;i++) 
      { 
      if(textlength<=first[i].length()) 
      { 
      if(ed.getText().toString().equalsIgnoreCase((String) first[i].subSequence(0, textlength))) 
      { 
      arr_sort.add(first[i]); 
      } 
      } 
      } 

     }});} 

}

，这是我的ListView适配器

public class ListViewAdapter extends BaseAdapter{ 
Activity context; 
String title[]; 
String description[]; 

public ListViewAdapter(Activity context, String[] title, String[] description) { 
    super(); 
    this.context = context; 
    this.title = title; 
    this.description = description; 
} 

public int getCount() { 
    // TODO Auto-generated method stub 
    return title.length; 
} 

public Object getItem(int position) { 
    // TODO Auto-generated method stub 
    return null; 
} 

public long getItemId(int position) { 
    // TODO Auto-generated method stub 
    return 0; 
} 

private class ViewHolder { 
    TextView txtViewTitle; 
    TextView txtViewDescription; 
} 

public View getView(int position, View convertView, ViewGroup parent) 
{ 
    // TODO Auto-generated method stub 
    ViewHolder holder; 
    LayoutInflater inflater = context.getLayoutInflater(); 

    if (convertView == null) 
    { 
     convertView = inflater.inflate(R.layout.listitem_row, null); 
     holder = new ViewHolder(); 
     holder.txtViewTitle = (TextView) convertView.findViewById(R.id.textView1); 
     holder.txtViewDescription = (TextView) convertView.findViewById(R.id.textView2); 
     convertView.setTag(holder); 
    } 
    else 
    { 
     holder = (ViewHolder) convertView.getTag(); 
    } 

    holder.txtViewTitle.setText(title[position]); 
    holder.txtViewDescription.setText(description[position]); 

return convertView; 
} 

}

Answer 1

我认为AutoCompleteTextView可能更适合实现此功能。

Answer 2

看看这个例子创建你自己的监听器检查按键事件Edittext内的值 - How to implement your own Listener

Answer 3

而不是延伸BaseAdapter您扩展ArrayAdapter。它为您实现了Filterable界面。在TextWatcher调用getFilter().filter(text);方法。

public void afterTextChanged(Editable s) { 
    listview.getAdapter().getFilter().filter(s); 
}