Question

大家好，我点击按钮

有问题

    fun mainPage(view: View) {
            val intent = Intent(applicationContext, MainActivity::class.java)
            intent.putExtra("input", userText.text.toString())
            startActivity(intent)
        }

       //second button started in here
         singupButton.setOnClickListener {
            fun crtUser (view: View) {
                val intent = Intent(applicationContext,createUser::class.java)
                startActivity(intent)
            }
        }

但我的按钮不起作用。我的问题在哪里？

Answer 1

你不需要定义一个函数声明（singupButton.setOnClickListener {view -> val intent = Intent(applicationContext,createUser::class.java) startActivity(intent) }），试试这个：

singupButton.setOnClickListener {
                  val intent = Intent(applicationContext,createUser::class.java)
                  startActivity(intent)
}

或只是

val myButton = findViewById<Button>(R.id.myButton) as Button
    //set listener
    myButton.setOnClickListener {
        //Action perform when the user clicks on the button.
        Toast.makeText(this@MainActivity, "You clicked me.", Toast.LENGTH_SHORT).show()
    }

这是一个基本样本

jshell> /set editor c:\sublime3\sublime_text.exe

Answer 2

问题是，你在点击监听器中定义了一个函数，你没有调用它。

您的原始代码：

singupButton.setOnClickListener {
     fun crtUser (view: View) {
         val intent = Intent(applicationContext,createUser::class.java)
         startActivity(intent)
     }
}

你应该调用这个函数：

singupButton.setOnClickListener { view ->
     fun crtUser (view: View) {
         val intent = Intent(applicationContext,createUser::class.java)
         startActivity(intent)
     }
     crtUser(view)
}

或者不定义此功能，只需调用它：

singupButton.setOnClickListener {
    val intent = Intent(applicationContext,createUser::class.java)
    startActivity(intent)
}

Kotlin setOnclickListener按钮不起作用

2 个答案: