Android用户界面 UI组件--自动提示输入框 AutoCompleteTextView和MultiAutoCompleteTextView

AutoCompleteTextView: 就是一个带自动提示的EditText,当输入字符时,会出现提示.
android:completionThreshold
输入几个字符时提示
android:completionHint/setCompletionHint(CharSequence)
设置出现下拉列表的提示标题
android:dropDownHeight/setDropHeight(int)
设置下拉列表的高度
android:dropDownWidth/setDropWidth(int)
设置下拉列表的宽度
android:popupBackground/setDropDownbackgroundResource(int)
设置下拉列表的背景
在Android程序中,为了展示数据,通常会用到一个Adapter的接口
setAdapter()设置提示内容的Adapter.

MultiAutoCompleteTextView是多选选项
使用MultiAutoCompleteTextView必须实现MultiAutoCompleteTextView.Tokenizer接口
用于声明用于选项与选项之间分隔的符号,一般如不特殊指定,可以使用Android为我们提供的实现类MultiAutoCompleteTextView.CommaTokenizer,它设定使用英文逗号","进行分隔选项.

例子：

<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"    tools:context=".MainActivity" >        <LinearLayout android:layout_width="match_parent"                  android:layout_height="wrap_content"                  android:orientation="horizontal">        <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="单选搜索"        tools:ignore="HardcodedText" />    <AutoCompleteTextView android:id="@+id/autoText"                          android:layout_width="match_parent"                          android:layout_height="wrap_content"                          />       </LinearLayout>   <LinearLayout android:layout_width="match_parent"                  android:layout_height="wrap_content">    <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="多选搜索"        tools:ignore="HardcodedText" />       <MultiAutoCompleteTextView android:id="@+id/autoMultiText"                              android:layout_width="match_parent"                              android:layout_height="wrap_content"                              />  </LinearLayout>   </LinearLayout>

package com.light.android.study;import android.app.Activity;import android.os.Bundle;import android.view.Gravity;import android.view.View;import android.view.View.OnClickListener;import android.widget.ArrayAdapter;import android.widget.AutoCompleteTextView;import android.widget.CheckBox;import android.widget.CompoundButton;import android.widget.MultiAutoCompleteTextView;import android.widget.MultiAutoCompleteTextView.CommaTokenizer;import android.widget.RadioGroup;import android.widget.RadioGroup.OnCheckedChangeListener;import android.widget.Toast;import android.widget.ToggleButton;public class MainActivity extends Activity {private AutoCompleteTextView autoText;private MultiAutoCompleteTextView autoMultiText;private String[] keywords = {"ab","abc","abdfdf","abnsd","abdfff"};@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);init();initAdapter();}private void init(){autoText = (AutoCompleteTextView) findViewById(R.id.autoText);autoMultiText = (MultiAutoCompleteTextView) findViewById(R.id.autoMultiText);}private void initAdapter(){ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_dropdown_item_1line, keywords);autoText.setAdapter(adapter);autoMultiText.setAdapter(adapter);autoMultiText.setTokenizer(new MultiAutoCompleteTextView.CommaTokenizer());}}

效果：

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