<RelativeLayout 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: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=".Activityfive" >
<AutoCompleteTextView 
android:id="@+id/acTextView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="请输入姓名："
android:textColor="#000"
android:maxLength="10"
/>
<MultiAutoCompleteTextView
android:id="@+id/macTextView"
android:layout_below="@id/acTextView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="请输入城市："
android:textColor="#000"
android:maxLength="20"
/>
</RelativeLayout>

import android.app.Activity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
import android.widget.MultiAutoCompleteTextView;
public class Activityfive extends Activity{
private AutoCompleteTextView acTextView;
private MultiAutoCompleteTextView macTextView;
private String [] arr = {"abc","abx","abo","bdc","bdf"};
private String [] brr = {"ab北京","ab南京","ab东京","bb莫斯科","bb英国","bb美国"};
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_five);
acTextView = (AutoCompleteTextView) findViewById(R.id.acTextView);
macTextView = (MultiAutoCompleteTextView) findViewById(R.id.macTextView);
ArrayAdapter<String> arrAdapt = new ArrayAdapter<String>(this, android.R.layout.simple_dropdown_item_1line, arr); 
acTextView.setAdapter(arrAdapt);
ArrayAdapter<String> brrAdapt = new ArrayAdapter<String>(this, android.R.layout.simple_dropdown_item_1line, brr);
macTextView.setAdapter(brrAdapt);
macTextView.setThreshold(1);//设置输入多少个字符开始自动匹配
macTextView.setTokenizer(new MultiAutoCompleteTextView.CommaTokenizer());//设置分隔符
}
}