安卓的EditText删除（退格键）键事件

问题描述

我如何检测删除（退格键）键事件的EDITTEXT？我已经使用TextWatcher尝试过，但是当EDITTEXT是空的，当我preSS删除键，没有任何反应。我想检测删除键preSS敌人的EDITTEXT即使没有文字。

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：onKeyListener不软键盘工作的

NOTE:onKeyListener doesn't work for soft keyboards

您可以设置 OnKeyListener 您 EDITTEXT 这样你就可以检测到任何按键preSS
编辑：我们正在检查 KeyEvent.KEY code_BACK 为退格键一个常见的​​错误，但实际上它是 KeyEvent.KEY code_DEL （真这个名字confusioning！）

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 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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