<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);

	}

}