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。
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.
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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