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delete（backspace）键事件？我尝试使用TextWatcher，但是当editText为空时，当我按删除键时，没有任何反应。我想检测删除键，即使没有任何文本，也可以输入editText。

解决方案

注意： onKeyListener 不适用于软键盘。 / p>

您可以为 editText 设置 OnKeyListener ，以便您可以检测任何按键新闻

编辑：一个常见的错误，我们正在检查 KeyEvent.KEYCODE_BACK for backspace ，但实际上它是 KeyEvent.KEYCODE_DEL （真的这个名字很混乱！）

  editText.setOnKeyListener（new OnKeyListener（）{
 @Override 
 public boolean onKey（View v，int keyCode，KeyEvent event）{
 //您可以确定按下 keyCode值与KeyEvent.KEYCODE_ 
 if（keyCode == KeyEvent.KEYCODE_DEL）{
 //这是用于backspace 
} 
返回false; 
} 
}）; 
  

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.

解决方案

NOTE: onKeyListener doesn't work for soft keyboards.

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

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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