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

MultiAutoCompleteTextView

Android AutoCompleteTextView

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"  
"http://schemas.android.com/tools"  
"match_parent"  
"match_parent"  
"vertical"  
".MainActivity" >  
      
"match_parent"  
"wrap_content"  
"horizontal">  
      
    <TextView  
"wrap_content"  
"wrap_content"  
"单选搜索"  
"HardcodedText" />  
  
"@+id/autoText"  
"match_parent"  
"wrap_content"  
                          />  
      
   </LinearLayout>  
"match_parent"  
"wrap_content">  
    <TextView  
"wrap_content"  
"wrap_content"  
"多选搜索"  
"HardcodedText" />  
      
"@+id/autoMultiText"  
"match_parent"  
"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"  
    };  
@Override  
protected 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(){  
new ArrayAdapter<String>(this, android.R.layout.simple_dropdown_item_1line, keywords);  
        autoText.setAdapter(adapter);  
        autoMultiText.setAdapter(adapter);  
new MultiAutoCompleteTextView.CommaTokenizer());  
    }  
      
  
}

效果：