每次输入新值时，文本字段为空？

Question

我的代码目前是一个随机数生成器，允许用户输入他们的名字和数字进行猜测，并显示他们的名字，他们的猜测以及猜测是否正确。它目前所做的是使它显示每个猜测，而我只希望它显示最新的一个，我将如何进行此操作？我的代码如下：

    public void addClick(View v){

    String randtext ="";
    Random rand = new Random();
    int noofguess = 0;
    int n = rand.nextInt(20)+1; //generate random number
    comments = "";

    comments = tvCommentOuput.getText().toString();
    comments = comments+ "\n" + etCommentInput.getText();
    comments = comments+ "\n" + etnameInput.getText();


    int userguess =     Integer.parseInt(etCommentInput.getText().toString());
    if (userguess < 1 || userguess > 20){
        comments = comments+ "\n" + "Please enter a number between 1-20!";
        tvCommentOuput.setText(comments);
    }
    else if (userguess == n){
        comments = comments+ "\n" + "You got it right!";
        tvCommentOuput.setText(comments);


    } else if (userguess > n) {
        comments = comments+ "\n" + "Number too high!";
        tvCommentOuput.setText(comments);

        noofguess = noofguess + 1;
    } else{
        comments = comments+ "\n" + "Number too low!";
        tvCommentOuput.setText(comments);


        noofguess = noofguess + 1;
    } 




    randtext = Integer.toString(n);








}