AutoCompleteText,MultiAutoCompleteText自动完成文本框

<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=".MainActivity" >

<AutoCompleteTextView
android:id="@+id/txt"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:completionHint="选择你的国籍"
android:completionThreshold="1"
android:popupBackground="@drawable/ic_launcher" />

<MultiAutoCompleteTextView
android:id="@+id/multxt"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:completionThreshold="1"/>

</LinearLayout>

package com.example.autoconpletetext;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
import android.widget.MultiAutoCompleteTextView;

public class MainActivity extends Activity {

AutoCompleteTextView txt;
MultiAutoCompleteTextView multxt;
public static final String[] data={"china","japan","Austrilia","canada"};

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ArrayAdapter<String> adapter=new ArrayAdapter<String>(MainActivity.this, android.R.layout.simple_dropdown_item_1line,data);

txt=(AutoCompleteTextView) findViewById(R.id.txt);
multxt=(MultiAutoCompleteTextView) findViewById(R.id.multxt);
multxt.setAdapter(adapter);
multxt.setTokenizer(new MultiAutoCompleteTextView.CommaTokenizer());
txt.setAdapter(adapter);

}

}