Question

如何使用Android Kotlin语言处理EditText上的Enter键？

Answer 1

贝娄是上述问题最简单的解决方案

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

Answer 2

我使用了何时表达来检查是否单击了输入按钮

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
        }


    }

Answer 3

制作一个简单的扩展功能：

inline fun View.onKey(vararg events: Int, crossinline listener: (keyCode: Int) -> Boolean) {
    setOnKeyListener { _, keyCode, event ->
        if (event.action in events) listener(keyCode) else false
    }
}

现在，您可以在需要的任何地方重用此功能，如下所示：

editText.onKey(KeyEvent.KEYCODE_ENTER, KeyEvent.ACTION_UP) {
  // your reaction on action

  true // return true if the listener has consumed the event, false otherwise.
}

Answer 4

第1步！重要 在XML中指定两个属性：

static class universal { public static int a = 10; } class class_a { public void change1() { universal.a--; } } class class_b { public void change2(ref int val)//use ref keyword for reference { int temp = val; //change in temp gives change in a val -= 5; } } static void Main(string[] args) { class_b B = new class_b(); class_a A = new class_a(); A.change1(); Console.WriteLine(universal.a);//it will print 9 B.change2(ref universal.a); //pass value by reference using ref keyword Console.WriteLine(universal.a);//it will print 4 Console.ReadKey(); }以便向用户显示正确的按下按钮
guard let path = Bundle.main.path(forResource: "SwiftUI", ofType: "pdf") else { return } let url = URL(fileURLWithPath: path)以便告诉用户他必须输入哪些文本，对文本进行编号等

步骤2 添加您的Kotlin文件：

android:imeOptions

此代码处理硬件和软件android:inputType密钥。我选择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 }的原因是因为它可以更好地处理此操作。根据Docs：

enter

处理EditText上的Enter键（Kotlin，Android）

4 个答案: