Android EditText 删除(退格)键事件 [英] Android EditText delete(backspace) key event

问题描述

如何检测editText 的删除(退格)键事件?我试过使用 TextWatcher，但是当 editText 为空时，当我按下删除键时，没有任何反应.即使它没有文本，我也想检测编辑文本的删除键.

How can I detect delete (backspace) key event for a editText? I've tried using TextWatcher, but when the editText is empty, when I press delete key, nothing happens. I want to detect delete key press foe an editText even if it has no text.

推荐答案

注意:onKeyListener 不适用于软键盘.

NOTE: onKeyListener doesn't work for soft keyboards.

您可以为您设置 OnKeyListener editText 以便您可以检测任何按键
我们正在检查 KeyEvent.KEYCODE_BACK 是否为 backspace 的一个常见错误，但实际上它是 KeyEvent.KEYCODE_DEL(这个名字真的很令人困惑！)

You can set OnKeyListener for you editText so you can detect any key press
A common mistake we are checking KeyEvent.KEYCODE_BACK for backspace, but really it is KeyEvent.KEYCODE_DEL (Really that name is very confusing! )

editText.setOnKeyListener(new OnKeyListener() {                 
    @Override
    public boolean onKey(View v, int keyCode, KeyEvent event) {
        //You can identify which key pressed buy checking keyCode value with KeyEvent.KEYCODE_
        if(keyCode == KeyEvent.KEYCODE_DEL) {  
            //this is for backspace
        }
        return false;       
    }
});

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