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：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:padding="5dp" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Country_single" />

    <AutoCompleteTextView
        android:id="@+id/autocomplete_country"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="5dp"
        android:completionHint="请选择:"
        android:completionThreshold="1"
        android:dropDownHorizontalOffset="10dp" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Country_multi" />

    <MultiAutoCompleteTextView
        android:id="@+id/multi"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="5dp" />

</LinearLayout>

修改MainActivity.java代码：

package com.example.autocompletetextviewdemo;

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

public class MainActivity extends Activity {

    public boolean actvflag = true;
    public String[] countries = null;
    private MultiAutoCompleteTextView multi=null;  

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        AutoCompleteTextView autoCompleteTextView = (AutoCompleteTextView) findViewById(R.id.autocomplete_country);
        multi = (MultiAutoCompleteTextView) findViewById(R.id.multi);  
        
        if (actvflag) {
             countries = new String[] { "Apple", "Android", "asian",
                    "American", "Andorra" };
        } else {
             countries = getResources().getStringArray(
                    R.array.countries_array);
        }
        // 配置Adaptor
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
                android.R.layout.simple_dropdown_item_1line, countries);

        autoCompleteTextView.setAdapter(adapter);
        
        //初始化multi  
        multi.setAdapter(adapter); 
        //设置输入多少字符后提示，默认值为2，在此设为１ 
        multi.setThreshold(1);  
        //用户必须提供一个MultiAutoCompleteTextView.Tokenizer用来区分不同的子串。  
        multi.setTokenizer(new MultiAutoCompleteTextView.CommaTokenizer());  
    }

}

再改下value/string.xml文件：

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <string name="app_name">AutoCompleteTextViewDemo</string>
    <string name="hello_world">Hello world!</string>
    <string name="action_settings">Settings</string>

    <string-array name="countries_array">
        <item>Babylon</item>
        <item>background</item>
        <item>Barbados</item>
        <item>Bag</item>
        <item>bacteria</item>
        <item>Belize</item>
        <item>baggage</item>
    </string-array>

</resources>

运行效果：

点击"AutoCompleteTextView":

   

点击"MultiAutoCompleteTextView“框：