28、editText只输入英文字母和'-'，用于授权码输入

 InputFilter filter = new InputFilter() {

             @Override
             public CharSequence filter(CharSequence source, int start, int end,
                     Spanned dest, int dstart, int dend) {
                 // TODO Auto-generated method stub
                 for (int i = start; i < end; i++)
                 {
                     //在这里判断输入的只能是英文字母和符号'-'
                     if (!Character.isLetter(source.charAt(i))
                             && source.charAt(i) != '-')
                     {
                         return "";
                     }
                 }
                 return null;
             }
         };

         etActivteCode.setFilters(new InputFilter[] { filter });
         etActivteCode.addTextChangedListener(new TextWatcher() {

             @Override
             public void onTextChanged(CharSequence s, int start, int before,
                     int count) {
                 // TODO Auto-generated method stub

                 etActivteCode.removeTextChangedListener(this);// 解除文字改变事件

                 if ((s.length() == 4 || s.length() == 9 || s.length() == 14)) {
                     etActivteCode.setText(s.toString().toUpperCase() + "-");// 转换
                 } else {
                     etActivteCode.setText(s.toString().toUpperCase());// 转换
                 }

                 etActivteCode.setSelection(s.toString().length());// 重新设置光标位置
                 etActivteCode.addTextChangedListener(this);// 重新绑
                 String licensePlateNumber = etActivteCode.getText().toString()
                         .trim();
             }

             @Override
             public void beforeTextChanged(CharSequence s, int start, int count,
                     int after) {
                 // TODO Auto-generated method stub
             }

             @Override
             public void afterTextChanged(Editable s) {
                 // TODO Auto-generated method stub

                 if (s.length() == 19) {
                     buttonActivate.setVisibility(View.VISIBLE);
                     InputMethodUtils.HideKeyboard(etActivteCode);
                 }

             }
         });
         etActivteCode.setOnKeyListener(new OnKeyListener() {
             @Override
             public boolean onKey(View v, int keyCode, KeyEvent event) {
                 // TODO Auto-generated method stub
                 if (keyCode == KeyEvent.KEYCODE_DEL) {
                     CommonUtils.LogWuwei(tag, "delete");
                     etActivteCode.setText("");
                     buttonActivate.setVisibility(View.INVISIBLE);
                 }
                 return false;
             }
         });
     }

效果如下: