最终的效果如下：

main.xml代码如下：

java代码为：

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
     
       av = new ArrayAdapter
      
       (this,				android.R.layout.simple_dropdown_item_1line, books);		AutoCompleteTextView auto = (AutoCompleteTextView) findViewById(R.id.autoCompleteTextView1);		auto.setAdapter(av);	}}