如何显示仅显示以输入字符开头的单词的自动完成文本视图的建议列表

Question

我想显示仅包含以输入字符开头的单词而不包含包含输入字符的单词的建议列表。

例如，假设我输入 L，它会显示像

这样的列表

["Launga Beach","Launga Hills","Launga Woods"]

不是这样的

["Echo Lake,"Fields Landing","Green Vally Lake"]

这是我的代码

 ArrayAdapter<String> cityAdapter = new ArrayAdapter<String>(getActivity(),R.layout.auto_complete_select_dialog_item,mCityZipCodeMasterForCity.getCity());
        cityAutoCompleteTextView.setThreshold(1);
        cityAutoCompleteTextView.setAdapter(cityAdapter);
        cityAutoCompleteTextView.setOnFocusChangeListener(new AutoCompleteTextValidator());

在 android 的自动完成文本视图中有没有实现这个的方法？

谢谢！

Answer 1

有String的方法

public boolean startsWith(String prefix)

示例

String text = "searching my text";
boolean value = text.startsWith("searching"); // return true
boolean value1 = text.startsWith("my"); // return false

忽略大小写

boolean value = text.toLowerCase().startsWith("searching".toLowerCase());

Answer 2

下面我添加了示例 Adapter 供您参考 Custom 过滤器。

你只需要你的过滤逻辑。

CustomAdapter.java

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.Filter;

import java.util.ArrayList;
import java.util.List;


public class CustomAdapter extends ArrayAdapter<String> {

    Context context;
    int resource, textViewResourceId;
    List<String> items, tempItems, suggestions;

    public CustomAdapter(Context context, int resource, int textViewResourceId, List<String> items) {
        super(context, resource, textViewResourceId, items);
        this.context = context;
        this.resource = resource;
        this.textViewResourceId = textViewResourceId;
        this.items = items;
        tempItems = new ArrayList<String>(items); // this makes the difference.
        suggestions = new ArrayList<String>();
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View view = convertView;
        // Handle your layout here
        return view;
    }

    @Override
    public Filter getFilter() {
        return nameFilter;
    }

    /**
     * Custom Filter implementation for custom suggestions we provide.
     */
    Filter nameFilter = new Filter() {
        @Override
        public CharSequence convertResultToString(Object resultValue) {
            return resultValue.toString();
        }

        @Override
        protected FilterResults performFiltering(CharSequence constraint) {
            if (constraint != null) {
                suggestions.clear();

                // Here you can add your pattern like L* for starting string with 'L'
                for (String item : tempItems) {
                    if (item.startsWith("your pattern here")) {
                        suggestions.add(item);
                    }
                }
                FilterResults filterResults = new FilterResults();
                filterResults.values = suggestions;
                filterResults.count = suggestions.size();
                return filterResults;
            } else {
                return new FilterResults();
            }
        }

        @Override
        protected void publishResults(CharSequence constraint, FilterResults results) {
            List<String> filterList = (ArrayList<String>) results.values;
            if (results != null && results.count > 0) {
                clear();
                for (String item : filterList) {
                    add(item);
                    notifyDataSetChanged();
                }
            }
        }
    };
}

谢谢。

如何显示仅显示以输入字符开头的单词的自动完成文本视图的建议列表

How to show suggestion list for Autocomplete Textview that shows only those words that begin with input character

java

android

autocompletetextview