Android用户输入自动提示控件AutoCompleteTextView使用方法

package fry;

import com.example.AutoCompleteTextViewDemo1.R;

import android.app.Activity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;

public class Activity01 extends Activity{
 private AutoCompleteTextView autoCompleteTextView1;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  // TODO Auto-generated method stub
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity01);
  autoCompleteTextView1=(AutoCompleteTextView) findViewById(R.id.autoCompleteTextView1);
  /*
   * AutoCompleteTextView实现自动提示的方法
   * 第一步、创建适配器
   * 第二步、AutoCompleteTextView对象应用适配器
   * 
   */
  
  String[] arr={"凯撒","凯撒广场","凯撒大帝"};
  ArrayAdapter<String> adapter= new ArrayAdapter<String>(this, R.layout.textview, arr);
  autoCompleteTextView1.setAdapter(adapter);
 }
}

<?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/autoCompleteTextView1"
  android:layout_width="match_parent"
  android:layout_height="wrap_content"
  />

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:orientation="vertical" >
 <!-- 这里是直接TextView，而不是layout下的TextView -->
</TextView > 

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:orientation="vertical" >
 <!-- 这里是直接TextView，而不是layout下的TextView -->
</TextView >