如何知道 EditText 中的按键

How to know key presses in EditText(如何知道 EditText 中的按键)

问题描述

我需要检测 EditText 中软键盘或硬键盘上的每个按键.我只需要在按下字符时一次发送一个字符，不需要最终的文本字符串.

I need to detect every key press on either a soft or hard keyboard in EditText. I just need to send the characters one at a time as they are pressed and don't need the final text string.

我曾尝试将 EditText 与 onKeyPress 一起使用，但我在这里遇到了问题，即无法使用软键盘和 TextWatcher 进行按键操作不是一个好的选择，因为我需要每个按键.是否有任何解决方案可以知道所有按键(包括返回、移位、回车...也)?

I have tried using an EditText with onKeyPress, but I ran into the problems here with not getting key presses with soft keyboards and TextWatcher isn't a good option because I need each key press. Is there any solution to know all the keypresses (including back, shift, enter... also)?

推荐答案

如果你有一个EditText，那么你可以使用TextWatcher接口.在我的代码中，search_edit 是一个 EditText.

If you have an EditText, then you can use the TextWatcher interface. In my code, search_edit is an EditText.

search_edit.addTextChangedListener(new TextWatcher() {          
    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) {                                   
        //here is your code
        myadapter.getFilter().filter(s);
        listview.setAdapter(myadapter); 
    }                       
    @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                  
    }
});

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