如何在 android (Kotlin) 中扩展 Snackbar

Question

I want to create a class which extends Snackbar but I couldn't find the constructor in the Google documentation. How should I add the constructor to the class:

import com.google.android.material.snackbar.Snackbar

class MySnackbar : Snackbar { 
    // Error: need a constructor
}

Answer 1

SnackBar is final class and thus cannot be inherited. One way is to access SnackBar's view ( snackbar.getView() ) and modify the view as per your need.

Answer 2

Snakbar 是 final 类，它不是继承的，但您可以修改 Snakbar 的视图。

Answer 3

You can create secondary constructor, Use below code for Kotlin.

class MyCustomSeekBar : AppCompatSeekBar {
    constructor(context: Context?) : super(context)
    constructor(context: Context?, attrs: AttributeSet?) : super(context, attrs)
    constructor(context: Context?, attrs: AttributeSet?, defStyleAttr: Int) : super(context, attrs, defStyleAttr)
}

Hope it helps you.