android中实现自动匹配

MainActivity中：

package com.example.com.yuxinyicheng.test2;


import android.app.Activity;
import android.os.Bundle;
import android.widget.Adapter;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
/*
步骤：
① 要一个对象AutoCompleteTextView
② 要一个适配器ArrayAdapter<String> aa=new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, str);
③ 要一个数据源String[] str=new String[]{"beijing1","beijing2","beijing3","shanghai1","shanghai2"};将资源传递给适配器
④ 将适配器绑定在AutoCompleteTextView对象上
*/


public class MainActivity extends Activity {

private AutoCompleteTextView actv;
String[] str=new String[]{"beijing1","beijing2","beijing3","shanghai1","shanghai2"};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

actv=(AutoCompleteTextView)findViewById(R.id.autoCompleteTextView1);
ArrayAdapter<String> aa=new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1, str);
actv.setAdapter(aa);
}
}

在activity_main.xml文件中

<?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"   
        android:completionThreshold="2"   
        android:hint="请输入您想要输入的内容" >
        <requestFocus />
    </AutoCompleteTextView>


</LinearLayout>