FixedHeightScrollingViewBehavior.java

package com.evs.demo.layout;

import android.content.Context;
import android.content.res.TypedArray;
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;

import java.util.List;

public class FixedScrollingViewBehavior extends AppBarLayout.ScrollingViewBehavior{

    public FixedScrollingViewBehavior() {
    }

    public FixedScrollingViewBehavior(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public boolean onMeasureChild(CoordinatorLayout parent, View child, int parentWidthMeasureSpec, int widthUsed, int parentHeightMeasureSpec, int heightUsed) {
        if(child.getLayoutParams().height == -1) {
            List dependencies = parent.getDependencies(child);
            if(dependencies.isEmpty()) {
                return false;
            }

            AppBarLayout appBar = findFirstAppBarLayout(dependencies);
            if(appBar != null && ViewCompat.isLaidOut(appBar)) {
                if(ViewCompat.getFitsSystemWindows(appBar)) {
                    ViewCompat.setFitsSystemWindows(child, true);
                }

                int scrollRange = appBar.getTotalScrollRange();
                int height = parent.getHeight() - appBar.getMeasuredHeight() + Math.min(scrollRange,  parent.getHeight()- heightUsed);
                int heightMeasureSpec = View.MeasureSpec.makeMeasureSpec(height, View.MeasureSpec.EXACTLY);
                parent.onMeasureChild(child, parentWidthMeasureSpec, widthUsed, heightMeasureSpec, heightUsed);
                return true;
            }
        }

        return false;
    }

    private static AppBarLayout findFirstAppBarLayout(List<View> views) {
        int i = 0;

        for(int z = views.size(); i < z; ++i) {
            View view = (View)views.get(i);
            if(view instanceof AppBarLayout) {
                return (AppBarLayout)view;
            }
        }

        return null;
    }
}

layout.xml

    <android.support.v4.widget.NestedScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="com.evs.demo.layout.FixedScrollingViewBehavior">
        
     .....   
    </android.support.v4.widget.NestedScrollView>

Hi, I haven't tried this yet but I guess you should be able to do it by overriding the behavior on the AppBarLayout (android.support.design.widget.AppBarLayout.ScrollingViewBehavior).

I worked with the NestedScrollView for almost 3 hours without a solution, this class saved my life! Thanks a lot

nice job! thanks

thanks a lot!

how this will work in this layout ? i want a xml like : RelativeLayout + Linearlayout + Design Tab Layout + viewpager (Now ViewPager contains Fragment for each Tab ? ) but now i want once i try to scroll any tabLayout (Fragment) it should scroll from top or with top means tab will also move

I worked on this problem for hours.

Thank you ! 👍

Thank you!!

I am unable to use it. Please help me for this

very nice, tks!!