<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <AutoCompleteTextView
        android:id="@+id/autoCompleteTextView1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:completionHint="请选择你喜欢的歌曲"
        android:completionThreshold="1"
        android:dropDownHorizontalOffset="20dp"
        android:ems="10"
        android:text="AutoCompleteTextView" >

        <requestFocus />
    </AutoCompleteTextView>

</LinearLayout>

package android.demo;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.BitmapDrawable;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnTouchListener;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
import android.widget.Button;
import android.widget.ImageView;

public class AndroidDemo5Activity extends Activity {

    // 定义字符串数组作为提示的文本
    String[] books = new String[] { "rollen", "rollenholt", "rollenren", "roll" };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        // 创建一个ArrayAdapter封装数组
        ArrayAdapter<String> av = new ArrayAdapter<String>(this,
                android.R.layout.simple_dropdown_item_1line, books);
        AutoCompleteTextView auto = (AutoCompleteTextView) findViewById(R.id.autoCompleteTextView1);
        auto.setAdapter(av);
    }
}