CODEWITHSUNDEEP
androidkotlinandroid-viewandroid-appcompat
es0329
es0329

Reputation: 1432

What's the correct way to subclass AppCompatButton?

// FooButton.kt
class FooButton : AppCompatButton {
    @JvmOverloads constructor(context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0)
        : super(context, attrs, defStyleAttr)

    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
    constructor(context: Context, attrs: AttributeSet?, defStyleAttr: Int, defStyleRes: Int)
        : super(context, attrs, defStyleAttr, defStyleRes) // Nope
}

Everything's fine when subclassing AppCompatTextView but not AppCompatButton, even though both inherit View's signature so subclasses can have their own base styles. Which is exactly what I'm trying to do.

I get an error at the Lollipop constructor's super call that no functions can be called with the arguments supplied. AppCompatButton! What makes you so special?!

Upvotes: 1

Views: 372

Answers (1)

ianhanniballake
ianhanniballake

Reputation: 200080

As per the documentation for AppCompatButton, AppCompatButton does not have a 4 argument constructor, despite View having a 4 argument constructors - constructors are treated differently from methods.

Upvotes: 1

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