Android中控件AutoCompleteTextView的使用方法和一些属性

<?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/auto_seekTips"
        android:layout_width="match_parent"
        android:layout_height="45dp"
        android:layout_marginLeft="20dp"
        android:layout_marginRight="20dp"
        android:layout_marginTop="5dp"
        android:completionThreshold="1"
        android:dropDownWidth="match_parent"
        android:dropDownVerticalOffset="10dp"
        android:hint="请输入"
        android:inputType="text"
        android:lines="1"
        android:maxLength="20"
        android:paddingLeft="15dp"
        android:textSize="15sp" />

</LinearLayout>

package com.chuanye.mybdemo;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.Editable;

import android.text.TextWatcher;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AutoCompleteTextView;

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

public class Main5Activity extends AppCompatActivity {
    //搜索提示控件
    private AutoCompleteTextView auto_seektips;

    private List<Result> resultsList = new ArrayList<>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main5);

        //将控件实例化
        auto_seektips = findViewById(R.id.auto_seekTips);

        Result result1 = new Result("aaa","aaaa");
        Result result2 = new Result("bbb","bbbb");
        Result result3 = new Result("ccc","cccc");
        Result result4 = new Result("ddd","dddd");
        Result result5 = new Result("eee","eeee");
        Result result6 = new Result("fff","ffff");
        resultsList.add(result1);
        resultsList.add(result2);
        resultsList.add(result3);
        resultsList.add(result4);
        resultsList.add(result5);
        resultsList.add(result6);
        Result result7 = new Result("aaa1","aaaaa");
        Result result8 = new Result("bbb1","bbbbb");
        Result result9 = new Result("ccc1","ccccc");
        Result result10 = new Result("ddd1","ddddd");
        Result result11 = new Result("eee1","eeeee");
        Result result12 = new Result("fff1","fffff");
        resultsList.add(result7);
        resultsList.add(result8);
        resultsList.add(result9);
        resultsList.add(result10);
        resultsList.add(result11);
        resultsList.add(result12);

        //自定义适配器的设置
        AutoCompleteTextAdapter adapter=new AutoCompleteTextAdapter(resultsList, Main5Activity.this);
        auto_seektips.setAdapter(adapter);

        //AutoCompleteAdapter文本内容变化前 ，变化时，变化后的一个实时监听
        //AutoCompleteTextView控件的点击事件
        auto_seektips.addTextChangedListener(new TextWatcher() {
            @Override//改变之前
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {

            }

            @Override//改变时
            public void onTextChanged(CharSequence s, int start, int before, int count) {

            }

            @Override//改变后
            public void afterTextChanged(Editable s) {

            }
        });

        //AutoCompleteAdapter点击事件的设置，

        auto_seektips.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                auto_seektips.setText("");
                //获取到过滤后的结果的集合
                ArrayList<Result> results=AutoCompleteTextAdapter.newvalues;

                if (results != null && results.size() > 0){
                    Result result=results.get(position);
                    String s=result.getDistrict();
                    auto_seektips.setText(s);
                    //将光标放到文本最后
                    auto_seektips.setSelection(auto_seektips.getText().length());
                }else {
                    auto_seektips.setText("");
                }

            }
        });

    }
}

package com.chuanye.mybdemo;

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Filter;
import android.widget.Filterable;
import android.widget.TextView;

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

public class AutoCompleteTextAdapter extends BaseAdapter implements Filterable {

    private ArrayFilter mFilter;//数据过滤器
    private List<Result> mList;//传进来的数据
    private ArrayList<Result> mFilteredData;//
    private Context context;//上下文
    public static ArrayList<Result> newvalues;
    public AutoCompleteTextAdapter(List<Result> mList, Context context) {
        this.mList = mList;
        this.context = context;
    }

    @Override
    public int getCount() {
        return mList == null ? 0 : mList.size();
    }

    @Override
    public Object getItem(int position) {
        return mList.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View view;
        ViewHolder viewHolder;
        if (convertView == null) {
            view = View.inflate(context, R.layout.seektipitem2, null);
            viewHolder = new ViewHolder();
            viewHolder.tv_city = view.findViewById(R.id.tv_city);
            viewHolder.tv_city1 = view.findViewById(R.id.tv_city1);
            view.setTag(viewHolder);
        } else {
            view = convertView;
            viewHolder = (ViewHolder) view.getTag();
        }

        Result resultlist = mList.get(position);
        viewHolder.tv_city.setText(resultlist.getName());
        viewHolder.tv_city1.setText(resultlist.getDistrict());

        return view;
    }
    class ViewHolder {
        public TextView tv_city;
        public TextView tv_city1;

    }

    /**
     * 在后台线程执行，定义过滤算法
     * getFilter()方法会返回一个Filter对象，Filter是一个数据过滤器，其过滤操作是通过performFiltering()方法和publishResult()方法完成的。
     * performFiltering（）方法进行过滤操作，publishResult（）方法用于发表过滤操作结果。
     *
     * @return
     */
    @Override
    public Filter getFilter() {
        //创建过滤器的对象
        if (mFilter == null) {
            mFilter = new ArrayFilter();
        }
        return mFilter;
    }
    //过滤器类
    class ArrayFilter extends Filter {
        /**
         * @param constraint:用户在输入框中所输入的内容
         * @return
         */
        @Override//进行过滤操作
        protected FilterResults performFiltering(CharSequence constraint) {
            //使用过滤操作的结果
            FilterResults results = new FilterResults();

            if (mFilteredData == null) {
                //以一个集合初始化mFilteredData=new ArrayList<String>(mList);//mList(数组容量)为集合
                mFilteredData = new ArrayList<>(mList);
            }
            //如果没有输入内容，则不过滤
            if (constraint == null || constraint.length() == 0) {
                ArrayList<Result> list = mFilteredData;
                results.values = list;
                results.count = list.size();
            } else {
                //过滤的条件
                String constraintString = constraint.toString().toLowerCase();
                //将传进来的全部数据赋值给filteredValues
                ArrayList<Result> filteredValues = mFilteredData;
                int count = filteredValues.size();

                newvalues = new ArrayList<>(count);
                //循环变量数据源，如果有属性满足过滤条件，则添加到result中
                for (int i = 0; i < count; i++) {
                    Result resultData = filteredValues.get(i);
                    if (resultData != null) {

                        //过滤条件
                        if (resultData.getDistrict() != null && resultData.getDistrict().startsWith(constraintString)) {
                            newvalues.add(resultData);
                        }
                    }

                    results.values = newvalues;
                    results.count = newvalues.size();
                }
            }
            return results;
        }
        @Override//发表过滤操作结果
        protected void publishResults(CharSequence constraint, FilterResults results) {

            mList = (List<Result>) results.values;
            if (results.count > 0) {
                //重绘当前可见区域
                notifyDataSetChanged();
            } else {
                //重绘控件，还原到初始状态
                notifyDataSetInvalidated();
            }
        }
    }

}

来源：https://blog.csdn.net/wpn_931/article/details/82799930