如何在CharSequence中获得一个精确的字符？

Question

当我知道字符中的字符的位置(或键)时,我想只提取CharSequence中的确切字符!

For eg: In the CharSequence "HELLO" I want to Extract the letter in the position 2 which is "E" in this case.我怎样才能做到这一点？

更具体: 我正在构建一个Android应用程序,我使用TextWatcher来获取TextEdit字段中人们输入的文本,如下所示.

    EditText KeyLogEditText = (EditText) findViewById(R.id.editTextforKeyLog);
    KeyLogEditText.addTextChangedListener(new TextWatcher() {

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
            // Here is where I need help!!
            // I have the "start" and "before" keys I have the position of the character inserted
            // I need to obtain the EXACT character from the CharSequence "s", How do I Do that?                

        }

        @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

        }
    });

我的问题也在代码中进行了评论.

感谢任何人都能提供的帮助.平硐

Answer 1

使用的charAt()方法上CharSequence.