android中的AutoCompleteTextView

Question

在Android AutoCompleteTextView中，当我们正确输入第一个字母时，只显示show dropdown。我想要的是当我在字符串中输入任何字母序列时它应该显示下拉。例如“January”在我的数组中所以当我在AutoComplete字段中输入“anu”，它应该在下拉列表中显示“january”。请帮助。 谢谢

Answer 1

您可能会编写自己的Filter并通过TextWatcher附加。此响应在AutoCompleteTextView：Android AutoCompleteTextView with Regular Expression?中有一个正则表达式的示例，这是另一个正则表达式/ java示例：How can I perform a partial match with java.util.regex.*?

编辑：您需要扩展ArrayAdapter以覆盖getFilter（）并返回自定义过滤器。

所以你会有这样的事情：

autoCompleteTextView.setAdapter(arrayAdapter);
autoCompleteTextView.addTextChangedListener(new TextWatcher() {
   public void onTextChanged(CharSequence s, int start, int before, int count) {
      arrayAdapter.getFilter().filter(s);
   }
});

public class RegexFilter extends Filter{

   ArrayAdapter<String> mAdapter;
   public RegexFilter(ArrayAdapter<String> adapter) {
      mAdapter = adapter;
   }
...
   @Override
   protected FilterResults performFiltering(CharSequence constraint) {
      Pattern p = Pattern.compile(constraint);
      Matcher m = p.matcher("");
      List listOfMatches = new ArrayList<String>();
      for (String curMonth : months) {
         m.reset(curMonth);
         if (m.matches || m.hitEnd()) {
            listOfMatches.add(curMonth);
         }
      }
      FilterResults results = new FilterResults();
      results.values = listOfMatches;
      results.count = listOfMatches.size();
      return results;
   }

   @Override
   protected void publishResults(CharSequence constraint, FilterResults results) {
      mAdapter.addAll(results.values);
      mAdapter.notifyDataSetChanged();
   }
}

public class PartialArrayAdapter extends ArrayAdapter<String> {
   ...
   RegexFilter mFilter;
   @Override
   public TimedSuggestionFilter getFilter() {
      if(null == mFilter)
         mFilter = new RegexFilter(this);
      return mFilter;
   }