29.Android之文本框输入自动提示学习

我们在用百度、淘宝等之类搜索输入一些字符时，会自动弹出一个下拉框提示类似的结果。在Android中提供了两种智能输入框，它们是AutoCompleteTextView、MultiAutoCompleteTextView，今天来学习下。

AutoCompleteTextView、MultiAutoCompleteTextView二者区别是前者选择一个，后者可以选择多个。

直接上代码，首先改下xml文件：

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:layout_width="fill_parent"
 4     android:layout_height="wrap_content"
 5     android:orientation="vertical"
 6     android:padding="5dp" >
 7 
 8     <TextView
 9         android:layout_width="wrap_content"
10         android:layout_height="wrap_content"
11         android:text="Country_single" />
12 
13     <AutoCompleteTextView
14         android:id="@+id/autocomplete_country"
15         android:layout_width="fill_parent"
16         android:layout_height="wrap_content"
17         android:layout_marginLeft="5dp"
18         android:completionHint="请选择:"
19         android:completionThreshold="1"
20         android:dropDownHorizontalOffset="10dp" />
21 
22     <TextView
23         android:layout_width="wrap_content"
24         android:layout_height="wrap_content"
25         android:text="Country_multi" />
26 
27     <MultiAutoCompleteTextView
28         android:id="@+id/multi"
29         android:layout_width="fill_parent"
30         android:layout_height="wrap_content"
31         android:layout_marginLeft="5dp" />
32 
33 </LinearLayout>

修改MainActivity.java代码：

 1 package com.example.autocompletetextviewdemo;
 2 
 3 import android.app.Activity;
 4 import android.os.Bundle;
 5 import android.widget.ArrayAdapter;
 6 import android.widget.AutoCompleteTextView;
 7 import android.widget.MultiAutoCompleteTextView;
 8 
 9 public class MainActivity extends Activity {
10 
11     public boolean actvflag = true;
12     public String[] countries = null;
13     private MultiAutoCompleteTextView multi=null;  
14 
15     @Override
16     protected void onCreate(Bundle savedInstanceState) {
17         super.onCreate(savedInstanceState);
18         setContentView(R.layout.activity_main);
19 
20         AutoCompleteTextView autoCompleteTextView = (AutoCompleteTextView) findViewById(R.id.autocomplete_country);
21         multi = (MultiAutoCompleteTextView) findViewById(R.id.multi);  
22         
23         if (actvflag) {
24              countries = new String[] { "Apple", "Android", "asian",
25                     "American", "Andorra" };
26         } else {
27              countries = getResources().getStringArray(
28                     R.array.countries_array);
29         }
30         // 配置Adaptor
31         ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
32                 android.R.layout.simple_dropdown_item_1line, countries);
33 
34         autoCompleteTextView.setAdapter(adapter);
35         
36         //初始化multi  
37         multi.setAdapter(adapter); 
38         //设置输入多少字符后提示，默认值为2，在此设为１ 
39         multi.setThreshold(1);  
40         //用户必须提供一个MultiAutoCompleteTextView.Tokenizer用来区分不同的子串。  
41         multi.setTokenizer(new MultiAutoCompleteTextView.CommaTokenizer());  
42     }
43 
44 }

再改下value/string.xml文件：

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <resources>
 3 
 4     <string name="app_name">AutoCompleteTextViewDemo</string>
 5     <string name="hello_world">Hello world!</string>
 6     <string name="action_settings">Settings</string>
 7 
 8     <string-array name="countries_array">
 9         <item>Babylon</item>
10         <item>background</item>
11         <item>Barbados</item>
12         <item>Bag</item>
13         <item>bacteria</item>
14         <item>Belize</item>
15         <item>baggage</item>
16     </string-array>
17 
18 </resources>

运行效果：

点击"AutoCompleteTextView":

点击"MultiAutoCompleteTextView“框：