Android控件——AutoCompleteTextView与MultiAutoCompleteTextView(实现自动匹配输入的内容)

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <AutoCompleteTextView
        android:id="@+id/autoCompleteTextView1"
        android:completionThreshold="3"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:ems="10"
        android:hint="请输入关键词" >

        <requestFocus />
    </AutoCompleteTextView>
    
</LinearLayout>

package com.example.mooc;

import android.R.anim;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.Toast;

public class MainActivity extends Activity {

    private Button login_button;
    private ImageButton img_button;
    private AutoCompleteTextView autoCompleteTextView1;
    private String res[] = {"beijing1","beijing2","beijing3"};

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // 将布局文件引入到Activity
        setContentView(R.layout.auto_complete);
        /**
         * 1.初始化一个对象
         * 2.需要一个适配器
         * 3.初始化数据源
         * 4.设置适配器
         */
        autoCompleteTextView1 = (AutoCompleteTextView) findViewById(R.id.autoCompleteTextView1);
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, res);
        autoCompleteTextView1.setAdapter(adapter);

        
}

    <MultiAutoCompleteTextView
        android:id="@+id/multiAutoCompleteTextView1"
        android:completionThreshold="3"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:ems="10"
        android:hint="请输入你的收件人" />

private String res[] = { "beijing1", "beijing2", "beijing3" };
        /**
         * 1.初始化一个对象 2.需要一个适配器 3.初始化数据源 4.设置适配器 5.设置分隔符
         */
        mutiple = (MultiAutoCompleteTextView) findViewById(R.id.multiAutoCompleteTextView1);
        mutiple.setAdapter(adapter);
        // 设置分隔符
        mutiple.setTokenizer(new 
MultiAutoCompleteTextView.CommaTokenizer());