怎么在Android应用中利用EditText禁止在输入框中输入空格与特殊字符

/**
  * 禁止EditText输入空格
  * @param editText
  */
 public static void setEditTextInhibitInputSpace(EditText editText){
  InputFilter filter=new InputFilter() {
   @Override
   public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) {
    if(source.equals(" ")return "";
    else return null;
   }
  };
  editText.setFilters(new InputFilter[]{filter});
 }

/**
  * 禁止EditText输入特殊字符
  * @param editText
  */
 public static void setEditTextInhibitInputSpeChat(EditText editText){
  InputFilter filter=new InputFilter() {
   @Override
   public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) {
    String speChat="[`~!@#$%^&*()+=|{}':;',\\[\\].<>/&#63;~！@#￥%……&*（）——+|{}【】‘；：”“'。，、？]";
    Pattern pattern = Pattern.compile(speChat);
    Matcher matcher = pattern.matcher(source.toString());
    if(matcher.find())return "";
    else return null;
   }
  };
  editText.setFilters(new InputFilter[]{filter});
 }