보완 키보드 만드는데 질문이요

Question

 

       int passWordLength = passwordStr.length();

       if((curIndex == 0) || (passWordLength == 0)){

        return;

       }

     

    // 한글자씩 지우기  

    passwordStr = passwordStr.substring(0, curIndex-1) + passwordStr.substring(curIndex, passWordLength);

    editText.setText("");

    for(int i=0; i<passWordLength-1; i++){

     editText.append("*");

    }

    editText.setSelection(curIndex-1);

   }

  });

    }