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：
