英文:

onClick function for multiple buttons

问题

如何为多个按钮设置点击事件（或点击监听器）？原因是我不想为每个按钮编写相同的代码，唯一不同的变量只是每个按钮的“Feeling”。

这是我的代码：（如果不太明白，不好意思，我只是在做一些实验！）

fun onClick(view: View) {
val database = FirebaseDatabase.getInstance()
val myRef = database.getReference("Users")
val userLocation = "New York"
val userId = myRef.push().key
val info = Users(Feeling = "Good", Location = userLocation)

if (userId != null) {
    myRef.child(userId).setValue(info)
}

}

来自类文件的部分：

class Users(val Feeling: String, val Location: String) {

constructor() : this("","") {

}

}

<details>
<summary>英文:</summary>

How would I set an onclick function (or onclicklistner) to multiple buttons? The reason being, is I don&#39;t want to have to write this same code for each button, where the only different variable would be &quot;Feeling&quot; for each button.

This is my code: *(Sorry if it doesn&#39;t make sense, I&#39;m just experimenting right now!)*

fun onClick(view: View) {
val database = FirebaseDatabase.getInstance()
val myRef = database.getReference("Users")
val userLocation = "New York"
val userId = myRef.push().key
val info = Users(Feeling = "Good", Location=userLocation)

    if (userId != null) {
        myRef.child(userId).setValue(info)
    }
}

From the Class file:

class Users(val Feeling: String, val Location: String) {

constructor() : this("","") {

}

}

</details>


# 答案1
**得分**: 1

点击监听器接收一个 view 作为参数，你可以使用它来通过其 id 来识别按钮，

val clickListener = View.OnClickListener { button ->
    val feeling = when (button.id) {
        R.id.button_1 -> /* 获取情感 */
        R.id.button_2 -> /* ... */
        ...
        else -> return
    // 使用情感来执行您需要的操作
}

然后，您可以将此点击监听器设置给所有按钮。

编辑：
要设置点击监听器，您有不同的选项。您可以为每个按钮使用 findViewById，使用 binding 对象然后绑定点击监听器，这取决于您的设置。

例如

override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
    view.findViewById<Button>(R.id.button_1).setOnClickListener(clickListener)
    view.findViewById<Button>(R.id.button_2).setOnClickListener(clickListener)
}

<details>
<summary>英文:</summary>

The click listener receives a `view` as parameter, you can use that to identify the button by it&#39;s id,

    val clickListener = View.OnClickListener { button -&gt;
        val feeling = when (button.id) {
            R.id.button_1 -&gt; /* get feeling */
            R.id.button_2 -&gt; /* ... */
            ...
            else -&gt; return
        // use the feeling to do whatever you need
    }

You would then set this click listener to all your buttons.

Edit:
to set the click listener, you have different options. You can use `findViewById` for each of them, using a `binding` object and then bind the click listener, it depends on your setup.

For instance

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        view.findViewById&lt;Button&gt;(R.id.button_1).setOnClickListener(clickListener)
        view.findViewById&lt;Button&gt;(R.id.button_2).setOnClickListener(clickListener)
    }


</details>