Android:inputType="textPassword"

   android:digits="0123456789"

public static String stringFilter(String str)throws PatternSyntaxException{   
   // 只允许字母、数字和汉字   
   String  regEx = "[^a-zA-Z0-9\u4E00-\u9FA5]";           
   Pattern  p  =  Pattern.compile(regEx);   
   Matcher  m  =  p.matcher(str);   
   return  m.replaceAll("").trim();   
 }

@Override 
   public void onTextChanged(CharSequence ss, int start, int before, int count) { 
     String editable = editText.getText().toString(); 
     String str = stringFilter(editable.toString());
     if(!editable.equals(str)){
       editText.setText(str);
       //设置新的光标所在位置 
       editText.setSelection(str.length());
     }
   } 

public abstract CharSequence filter ( 
  CharSequence source, //输入的文字 
  int start, //开始位置 
  int end, //结束位置 
  Spanned dest, //当前显示的内容 
  int dstart, //当前开始位置 
  int dend //当前结束位置 
);

editText.setFilters(new InputFilter[] { 
new InputFilter() { 
  public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart,
 int dend) { 
      for (int i = start; i < end; i++) { 
          if ( !Character.isLetterOrDigit(source.charAt(i)) && !Character.toString(source.charAt(i)) .equals("_") && !Character.toString(source.charAt(i)) .equals("-"))
 { 
              return ""; 
          } 
      } 
      return null; 
  } }); 

  EditText tv =newEditText(this); 

    int maxLength =10; 

    InputFilter[] fArray =new InputFilter[1]; 

    fArray[0]=new InputFilter.LengthFilter(maxLength); 

    tv.setFilters(fArray);