Android 下划线行表示要猜测的文本，然后用EditText中的输入文本替换下划线

我有一段文字，例如“这是一个问题”，必须通过一些线索来猜测。 在应用程序中，用户将在EditText中看到“uuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu。所以这就像“这是一个问题”

因为我在这个世界上是个新手，所以我不确定是否必须在EditText中添加一个监听器，它可以将用户输入替换为所需的内容或其他内容

任何回复都将不胜感激

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谢谢。

每当键入密钥时，请使用此方法：

 public static int getIndex(String input) {
    return input.replaceAll("_", "").length();
}

public static String prepareOutput(String actual, String input) {
    input = input.replaceAll("_", "");
    int diff = actual.length() - input.length();
    if (diff < 0) {
        return input;
    }
    for (int i = 0; i < diff; i++) {
        input += "_";
    }
    return input;
}

您需要在活动中实现，并重写其方法以执行您想要的操作。

 final EditText ed = (EditText) findViewById(R.id.editText1);
    ed.addTextChangedListener(new TextWatcher() {

        @Override
        public void onTextChanged(CharSequence s, int start, int before,
                int count) {
        }

        @Override
        public void beforeTextChanged(CharSequence s, int start, int count,
                int after) {
        }

        @Override
        public void afterTextChanged(Editable s) {
            String input = s.toString();
            String output = prepareOutput("This is a question", input);
            if (output.compareTo(input) != 0) {
                ed.setText(output);
                ed.setSelection(getIndex(output));
            }
        }
    });