处理EditText上的Enter键（Kotlin，Android）

如何在Android Kotlin语言中处理EditText上的Enter键？

下面是解决上述问题的最简单方法

    editText.setOnKeyListener(View.OnKeyListener { v, keyCode, event ->
                if (keyCode == KeyEvent.KEYCODE_ENTER && event.action == KeyEvent.ACTION_UP) {
                    //Perform Code 
                    return@OnKeyListener true
                }
                false
            })

---

我使用when表达式检查是否单击了enter按钮

edittext.setOnKeyListener { v, keyCode, event ->
        
        when {

            //Check if it is the Enter-Key,      Check if the Enter Key was pressed down
            ((keyCode == KeyEvent.KEYCODE_ENTER) && (event.action == KeyEvent.ACTION_DOWN)) -> {
                
                
                //perform an action here e.g. a send message button click
                sendButton.performClick()

                //return true
                return@setOnKeyListener true
            }
            else -> false
        }


    }

---

第1步[重要] 在XML中指定两个属性：

android:imeOptions

以向用户显示要按下的正确按钮

android:inputType

告诉用户需要输入什么文本、数字文本等

步骤2在Kotlin文件中添加：

yourEditText.setOnEditorActionListener { _, keyCode, event ->
        if (((event?.action ?: -1) == KeyEvent.ACTION_DOWN)
          || keyCode == EditorInfo.IME_PUT_THE_ACTION_YOU_HAVE_SET_UP_IN_STEP_1) {
          
             // Your code here

            return@setOnEditorActionListener true
        }
        return@setOnEditorActionListener false
}

此代码处理硬件和软件

enter

键。我之所以选择

setOnEditorActionListener

，是因为它能更好地处理此操作。根据文件：

   /**
     * Set a special listener to be called when an action is performed
     * on the text view.  This will be called when the enter key is pressed,
     * or when an action supplied to the IME is selected by the user.  Setting
     * this means that the normal hard key event will not insert a newline
     * into the text view, even if it is multi-line; holding down the ALT
     * modifier will, however, allow the user to insert a newline character.
     */

---

确保检查

操作是向下还是向上，以免重复
if（keyCode==KeyEvent.keyCode\u ENTER&&event.action==KeyEvent.action\u UP）
感谢您的反馈。我使用了return@OnKeyListener执行操作后隐藏键盘为false