<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"

     tools:context="com.example.lesson6_5_id19.MainActivity" >

     <!--单个字段扩充提示

     completionThreshold是控制用户输入第几个字符开始提示，最小值是1-->

     <AutoCompleteTextView

         android:id="@+id/actv"

         android:layout_width="match_parent"

         android:layout_height="wrap_content"

         android:hint="1.请输入联系人"

         android:completionThreshold="1"

         android:singleLine="true"/>

     <!-- 多个字段扩充提示 -->

     <MultiAutoCompleteTextView

         android:id="@+id/mactv"

         android:layout_width="match_parent"

         android:layout_height="wrap_content"

         android:hint="2.请输入联系人"

         android:completionThreshold="1"/>

 </LinearLayout>

<?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" >

    <!-- 自定义提示筐的TextView -->

    <TextView

        android:id="@+id/tv"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:text="显示文本"

        android:gravity="center"

        android:padding="10dp"

        android:background="#ccffcc"

        android:textColor="#ff0000"/>

</LinearLayout>

 package com.example.lesson6_5_id19;

 import android.app.Activity;

 import android.os.Bundle;

 import android.widget.ArrayAdapter;

 import android.widget.AutoCompleteTextView;

 import android.widget.MultiAutoCompleteTextView;

 public class MainActivity extends Activity {

     // 把提示的内容放到一个String数组里面

     String[] names = {"zhangshan","lisi","wangwu","zhaoliu",

             "zhangshan","lisi","wangwu","zhaoliu",

             "zhangshan","lisi","wangwu","zhaoliu",

             "zhangshan","lisi","wangwu","zhaoliu",

             "zhangshan","lisi","wangwu","zhaoliu",

             "zhangshan","lisi","wangwu","zhaoliu",};

     AutoCompleteTextView actv;

     MultiAutoCompleteTextView mactv;

     ArrayAdapter<String> adapter;

     @Override

     protected void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         setContentView(R.layout.activity_main);

         actv = (AutoCompleteTextView) findViewById(R.id.actv);

         mactv = (MultiAutoCompleteTextView) findViewById(R.id.mactv);

         // 适配器

         // 将数据与视图关联在一起

         // 系统已经帮我们写好了很多layout

         // adapter = new ArrayAdapter<String>(this//1.上下文

         // ,R.layout.item_actv_layout//2.布局

         // ,R.id.tv//该布局上的TextView的id号

         // ,names);//最后一个是数据

         // 选择系统的layout，里面的TextView的id号可以忽略不写

         adapter = new ArrayAdapter<String>(this, R.layout.activity_item, R.id.tv, names);

         //使用“，”来分割。

         mactv.setTokenizer(new MultiAutoCompleteTextView.CommaTokenizer());

         // 将适配器设置到view上

         actv.setAdapter(adapter);

         //设置适配器之前，必须要知道分隔符是什么样的。

         mactv.setAdapter(adapter);

     }

 }