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문자


MultiAutoCompleteTextView

颖哥儿

版本:Android 2.2 r1

 

public class MultiAutoCompleteTextView extends AutoCompleteTextView

 

java.lang.Object

android.view.View

       android.widget.TextView

              android.widget.EditText

                     android.widget.AutoCompleteTextView

                            android.widget.MultiAutoCompleteTextView

 

概述

        

一个继承自AutoCompleteTextView可编辑的文本视图,能够对用户键入的文本进行有效地扩充提示,而不需要用户输入整个内容。(用户输入一部分内容,剩下的部分系统就会给予提示)。

用户必须提供一个MultiAutoCompleteTextView.Tokenizer以用来区分不同的子串。

下面的代码片段展示了如何创建一个文本视图,这个视图用来对用户输入的国家名称进行有效地补充提示。

 

公共方法       

         public boolean enoughToFilter ()

    此方法并不是检验什么时候文本的总长度超过了预定的值,而是在仅当从函数findTokenStart()到getSelectionEnd()函数得到的文本长度为0或者超过了预定值的时候才起作用。(译者注:当文本长度超过阈值时过滤

 

         public void performValidation ()

         此子类方法并不是用来确定整个文本的有效性,而是用来确定文本中的单个符号的有效性。空标记将被移除。

 

         public void setTokenizer (MultiAutoCompleteTextView.Tokenizer t)

         设置用来决定用户正在输入文本的范围的分词组件。

 

受保护方法

         protected void performFiltering (CharSequence text, int keyCode)

此方法并不过滤整个编辑框的内容,只是过滤从函数findTokenStart() 到函数getSelectionEnd()获得的长度为0或者超过了预定的值的文本内容。

参数

text          指定过滤模式

keyCode           插入到编辑框中的最后一个字符;当字符(文本)是通过软键盘输入的时候,小心此字符的值可能为NULL

 

         protected void performFiltering (CharSequence text, int start, int end, int keyCode)

         启动对下拉式列表内容的过滤。过滤模式为编辑框中指定的范围。子类可覆盖此方法,以便于采用一个不同的模式。

 

         protected void replaceText (CharSequence text)

    通过替换从函数findTokenStart() 到函数 getSelectionEnd()得到的文本文本范围以及传递给函数terminateToken()的文版返回的结果来实现文本的输入。另外,文本的替换区域将会被标记为自动文本区,这样如果用户直接按DEL键,执行过程就会停止。子类可覆盖此方法来实现许多不同的文本插入工作。

参数

text          下拉列表里的选中项

 

补充

相关文章链接

Android控件之AutoCompleteTextViewMultiAutoCompleteTextView探究

AutoCompleteTextViewMultiAutoCompleteTextView

Auto Complete Text


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