Please support over scroll for NestedScrollView

[zappu9x]

No description provided.

[Hafeezllah-Khan]

Hi,

I have found a solution to add overscroll support for NestedScrollView using a custom adapter. Here's the code snippet for the custom adapter:

import android.view.View
import androidx.core.widget.NestedScrollView
import me.everything.android.ui.overscroll.adapters.IOverScrollDecoratorAdapter

class NestedScrollViewOverScrollDecorAdapter(private val mView: NestedScrollView) :
    IOverScrollDecoratorAdapter {

    override fun getView(): View {
        return mView
    }

    override fun isInAbsoluteStart(): Boolean {
        return !mView.canScrollVertically(-1)
    }

    override fun isInAbsoluteEnd(): Boolean {
        return !mView.canScrollVertically(1)
    }
}

Then, you can set up the overscroll effect in your Fragment or Activity like this:

val nestedScrollView = view.findViewById<NestedScrollView>(R.id.scroll)
val overScrollDecorAdapter = NestedScrollViewOverScrollDecorAdapter(nestedScrollView)
val overScrollDecorator = VerticalOverScrollBounceEffectDecorator(overScrollDecorAdapter)

overScrollDecorator.setOverScrollUpdateListener { _, _, offset ->
    val tension = 0.5f // Adjust the tension value here. Lower values result in less bounciness.
    val scaleFactor = 1f + tension * Math.abs(offset) / overScrollDecorAdapter.getView().height
    overScrollDecorAdapter.view.scaleY = scaleFactor.toFloat()
}