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Kotlin中TODO("not implemented")报错

Kotlin中TODO("not implemented")报错

作者: 简书_大叔 | 来源:发表于2020-02-25 15:28 被阅读0次

    首次使用Kotlin语言,创建了一个点击事件,结果以运行报错了,什么鬼。错误如下:

    02-25 15:09:48.629 4101-4101/com.tgh.project.mykotlin E/AndroidRuntime: FATAL EXCEPTION: main
    kotlin.NotImplementedError: An operation is not implemented: not implemented
    at com.tgh.project.mykotlin.MainActivity.initView(MainActivity.kt:27)
    at com.tgh.project.mykotlin.MainActivity.onCreate(MainActivity.kt:22)
    at android.app.Activity.performCreate(Activity.java:5104)
    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
    at android.app.ActivityThread.access600(ActivityThread.java:141) at android.app.ActivityThreadH.handleMessage(ActivityThread.java:1234)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loop(Looper.java:137)
    at android.app.ActivityThread.main(ActivityThread.java:5041)
    at java.lang.reflect.Method.invokeNative(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:511)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
    at dalvik.system.NativeStart.main(Native Method)

    根据错误的提示kotlin.NotImplementedError: An operation is not implemented: not implemented,说自己没有实现此方法,但代码确实是实现了的,代码如下

     private fun initView() {
            TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
            button_first.setOnClickListener(object:View.OnClickListener {
                override fun onClick(p0: View?) {
                    TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
                    Toast.makeText(this@MainActivity, "点击了按钮", Toast.LENGTH_LONG).show()
                }
    
            })
        }
    

    查看了官方TODO接口,

    fun TODO():
    Always throws NotImplementedError stating that operation is not implemented.

    说此方法总是抛出异常,它的作用就是提示用户尽快实现此接口或方法,起个催促的作用,解决的办法就是删除代码中TODO("not implemented")就行了
    改后如下

     private fun initView() {
            button_first.setOnClickListener(object:View.OnClickListener {
                override fun onClick(p0: View?) {
                    Toast.makeText(this@MainActivity, "点击了按钮", Toast.LENGTH_LONG).show()
                }
            })
        }
    

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