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当我知道字符在其中的位置(或键)时,我只想提取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?

更具体地说: 我正在构建一个 Android 应用程序,我在其中使用 TextWatcher 获取人们在 TextEdit 字段中输入的文本,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注释。

感谢任何人都可以提供的任何帮助。阿迪特

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1 回答 1

7

使用上charAt()方法CharSequence

于 2012-12-24T21:19:20.223 回答