计数 EditText 中的字符已更改侦听器

问题描述

在我的项目中，我有一个 EditText.我想计算 EditText 中的字符数，并在 TextView 中显示该数字.我已经编写了以下代码，它工作正常.但是，我的问题是当我单击 Backspace 时它会增加，但我需要减少数字.如何考虑 Backspace?

In my project I have an EditText. I want to count the characters in the EditText, and show that number it in a TextView. I have written the following code and it works fine. However, my problem is when I click Backspace it counts up, but I need to decrement the number. How can I consider Backspace?

tv = (TextView)findViewById(R.id.charCounts);
textMessage = (EditText)findViewById(R.id.textMessage);
textMessage.addTextChangedListener(new TextWatcher(){
    public void afterTextChanged(Editable s) {
        i++;
        tv.setText(String.valueOf(i) + " / " + String.valueOf(charCounts));
    }
    public void beforeTextChanged(CharSequence s, int start, int count, int after){}
    public void onTextChanged(CharSequence s, int start, int before, int count){}
}); 

推荐答案

使用

s.length()

曾经在其中一个答案中提出以下建议，但效率很低

The following was once suggested in one of the answers, but its very inefficient

textMessage.getText().toString().length()

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