AutoCompleteTextView实现自动匹配输入内容

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.prace3.MainActivity">

   <AutoCompleteTextView
       android:id="@+id/autotext"
       android:hint="请输入关键词"
       android:completionThreshold="2"
       android:layout_width="match_parent"
       android:layout_height="wrap_content" />
</RelativeLayout>

MainActivity.java

package com.example.prace3;

import android.app.Activity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;

public class MainActivity extends Activity {

    private AutoCompleteTextView actextview;
    private String[] res = {"And","Android","Android Studio","beijing","shanghai"};
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        /*
        1.初始化控件  2.需要一个适配器  3.初始化数据源（去匹配闻不如你框输入内容） 4.将adpter与当前AutoCompleteTextView绑定
         */
        actextview = findViewById(R.id.autotext);
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1, res);
        actextview.setAdapter(adapter);
    }
}