<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:completionThreshold="2"

        android:hint="请输入要搜索的关键词" />

</LinearLayout>

package com.muke.textview_edittext;

import android.os.Bundle;

import android.widget.ArrayAdapter;

import android.widget.AutoCompleteTextView;

import android.app.Activity;

public class MainActivity extends Activity{

    private AutoCompleteTextView autoTextVIew;

    //第三步：初始化数据源——匹配文本框中输入的内容

    private String[] res = {"beijing1","beijing2","beijing3","shanghai1","shanghai2","shenzhen1","shenzhen2","guangzhou1","guangzhou2"};

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        //第一步：找到需要操作的控件

        autoTextVIew = (AutoCompleteTextView) findViewById(R.id.autoCompleteTextView1);

        //第二步：需要一个适配器

        //android.R.layout.simple_list_item_1：是系统自带的布局

        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, res);

        //第四步：将adapter与当前AutoCompleteTextView绑定

        autoTextVIew.setAdapter(adapter);

    }

}