One library contains one behavior help appbarlayout to scroll spring. In the sample have add the realtimeblur test and add tablayout with TabScrimHelper(animate color with CollapsingToolbarLayout).Because of some methods in the Behavior of AppBarLayout not open to the out package. So I set the package name same to the support design.And add one fling_fix_behavior to fix the appbarlayout to scroll down fling. Also add one NestedFixFlingScrollView to fix NestedScrollView fling bug.

• AppBarLayout Spring
• AppBarLayout Fling fix
• NestedScrollView Fling Fix

Download Sample

First is with spring. Second with blur and TabScrimHelper.Third with fling fix

dependencies {
    compile 'com.github.todou:appbarspring:1.0.3'
}

####AppBarLayout-Spring

<android.support.design.widget.AppBarLayout
        ...
        app:layout_behavior="@string/appbar_spring_behavior"
        ...>
        ...
</android.support.design.widget.AppBarLayout>

if you want add blur with the spring.You can add this by the RealtimeBlurView:

final RealtimeBlurView realtimeBlurView = (RealtimeBlurView) findViewById(R.id.real_time_blur_view);
AppBarLayout appBarLayout = (AppBarLayout) findViewById(R.id.app_bar);
AppBarLayoutSpringBehavior springBehavior = (AppBarLayoutSpringBehavior) ((CoordinatorLayout.LayoutParams) appBarLayout.getLayoutParams()).getBehavior();
springBehavior.setSpringOffsetCallback(new AppBarLayoutSpringBehavior.SpringOffsetCallback() {
      @Override
      public void springCallback(int offset) {
           int radius = 20 * (240 - offset > 0 ? 240 - offset : 0) / 240;
           realtimeBlurView.setBlurRadius(radius);
      }
});

With the tablayout you can add TabScrimHelper to let TabLayout animate color with the CollapsingToolbarLayout:

TabScrimHelper tabScrimHelper = new TabScrimHelper(tabLayout, collapsingToolbarLayout);
appBarLayout.addOnOffsetChangedListener(tabScrimHelper);

####AppBarLayout-Fling Fix Maybe you will find the appbar fling when scroll down is not smooth. You can try this appbar fling fix behavior:

<android.support.design.widget.AppBarLayout
        ...
        app:layout_behavior="@string/appbar_fling_fix_behavior"
        ...>
        ...
</android.support.design.widget.AppBarLayout>

####NestScrollView-Fling Fix To let NestScrollView fling when scroll up.Just use the NestedFixFlingScrollView

Copyright 2016 ToDou

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