Using Android support design library on custom view

Question

I have a custom RelativeLayout and want to use the android support design library inside it (so I can use the CoordinatorLayout). I've tried adding

android:theme="@style/Theme.AppCompat.Light"

but am still getting this error:

Caused by: java.lang.IllegalArgumentException: You need to use a Theme.AppCompat theme (or descendant) with the design library.

Does this mean that I cannot use it on a custom view and only inside an Activity? Because I cannot use an activity here. I'm adding this view to the WindowManager. Any help is highly appreciated. Thanks!

Answer 1

Because you are adding the view with WindowManager and a Theme.AppCompat compatible theme is needed, you just need to set your theme before calling your LayoutInflater. For example: setTheme(R.style.AppTheme); It should work :)

Answer 2

In my case, I needed to add a android.support.design.widget.TabLayout to my custom keyboard. I solved the problem with:

override fun onCreate() {
    setTheme(R.style.AppTheme)

    super.onCreate()
}