Android 实现动态匹配输入的内容 AutoCompleteTextView和MultiAutoCompleteTextView

AutoCompleteTextView
1.功能：
动态匹配输入的内容，如百度搜索引擎当输入文本时可以根据内容显示匹配的热门信息。
2.独特属性：
android:completionThreshold 设置输入多少字符时自动匹配

使用AutoCOmpleteTextView实现自动匹配输入的内容
private AutoCompleteTextView acTextView;
初始化控件
acTextView = (AutoCompleteTextView) findViewById(R.id.autoCompleteTextView1);
初始化数据源（代码里res数组又增加了一些）
private String[] res = new String[] { "moon", "month", "moonlight", "moonlight poet" };
创建一个适配器（这里使用ArrayAdapter）
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_expandable_list_item_1, res);
讲adapter与当前AutoCompleteTextView绑定（通过.setAdapter()方法绑定）
acTextView.setAdapter(adapter);
在activity_main.xml设置当输入多少字符时出现adapter中的内容
android:completionThreshold="1"

MultiAutoCompleteTextView
1.功能
可支持选择多个值（在多次输入的情况下），分别用分隔符分开，并且在每个值选中的时候再次输入值会自动去匹配，可用在可短信，发邮件时选择联系人这种类型当中。
2.独特属性：
android:completionThreshold 设置输入多少字符时自动匹配
3.设置分隔符
mtxt.setTokenizer(new MultiAutoCompleteTextView.CommaTokenizer());

使用MultiAutoCOmpleteTextView实现自动匹配输入的内容
具体步骤和AutoCompleteTextView类似。
设置分隔符（设置以逗号为分隔符）
macTextView.setTokenizer(new MultiAutoCompleteTextView.CommaTokenizer());

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    >

    <AutoCompleteTextView
        android:id="@+id/autoCompleteTextView1"
        android:completionThreshold="1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="请输入你要搜索的关键词"
        >

        <requestFocus />
    </AutoCompleteTextView>

    <MultiAutoCompleteTextView
        android:id="@+id/multiAutoCompleteTextView1"
        android:completionThreshold="1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:ems="10"
        android:hint="请输入关键词（可多个，逗号分隔）" 
        />

    
</LinearLayout>

package com.example.autocompletetextviewandmulti;

import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
import android.widget.MultiAutoCompleteTextView;
import android.os.Build;

public class MainActivity extends ActionBarActivity {
    
    private AutoCompleteTextView acTextView;
    private MultiAutoCompleteTextView macTextView;
    private String[] res = new String[] { 
            "apple", "banana", "China", "delicious", "eight", "fight", "good",
            "hello", "intelligence", "just", "kilometer", "like",
            "moon", "month", "moonlight", "moonlight poet",
            "night", "ok", "pear", "queue", "ring", "stack", "tail",
            "unique", "very", "week", "x-Men", "yellow", "zero"
            };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        acTextView = (AutoCompleteTextView) findViewById(R.id.autoCompleteTextView1);
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_expandable_list_item_1, res);
        acTextView.setAdapter(adapter);
        
        macTextView = (MultiAutoCompleteTextView) findViewById(R.id.multiAutoCompleteTextView1);
        macTextView.setAdapter(adapter);
        macTextView.setTokenizer(new MultiAutoCompleteTextView.CommaTokenizer());
    }

}

效果：