Fixed AppBarLayout.Behavior for https://issuetracker.google.com/66996774

FixAppBarLayoutBehavior.kt

/*
 * Copyright (C) 2017 The Android Open Source Project & Erik Huizinga
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package your.package

import android.content.Context
import android.support.design.widget.AppBarLayout
import android.support.design.widget.CoordinatorLayout
import android.support.v4.view.ViewCompat
import android.util.AttributeSet
import android.view.View

/**
 * Workaround AppBarLayout.Behavior for https://issuetracker.google.com/66996774
 *
 *
 * See https://gist.github.com/chrisbanes/8391b5adb9ee42180893300850ed02f2 for
 * example usage.
 *
 * Kotlinised by Erik Huizinga (github: @erikhuizinga).
 */
class FixAppBarLayoutBehavior(context: Context?, attrs: AttributeSet?) :
		AppBarLayout.Behavior(context, attrs) {

	override fun onNestedScroll(coordinatorLayout: CoordinatorLayout, child: AppBarLayout,
	                            target: View, dxConsumed: Int, dyConsumed: Int, dxUnconsumed: Int,
	                            dyUnconsumed: Int, type: Int) {
		super.onNestedScroll(coordinatorLayout, child, target, dxConsumed, dyConsumed, dxUnconsumed,
				dyUnconsumed, type)
		stopNestedScrollIfNeeded(dyUnconsumed, child, target, type)
	}

	override fun onNestedPreScroll(coordinatorLayout: CoordinatorLayout, child: AppBarLayout,
	                               target: View, dx: Int, dy: Int, consumed: IntArray, type: Int) {
		super.onNestedPreScroll(coordinatorLayout, child, target, dx, dy, consumed, type)
		stopNestedScrollIfNeeded(dy, child, target, type)
	}

	private fun stopNestedScrollIfNeeded(dy: Int, child: AppBarLayout, target: View, type: Int) {
		if (type == ViewCompat.TYPE_NON_TOUCH) {
			val currOffset = topAndBottomOffset
			if (dy < 0 && currOffset == 0 || dy > 0 && currOffset == -child.totalScrollRange) {
				ViewCompat.stopNestedScroll(target, ViewCompat.TYPE_NON_TOUCH)
			}
		}
	}
}

Thanks you for that!

Please add the default empty constructor implementation as well for usages in Kotlin files directly.

please change this from
class FixAppBarLayoutBehavior(context: Context?, attrs: AttributeSet?) to

class FixAppBarLayoutBehavior @jvmoverloads constructor(context: Context?, attrs: AttributeSet?)