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package <your package>;

import android.animation.ValueAnimator;

import android.content.Context;

import android.support.annotation.NonNull;

import android.support.design.button.MaterialButton;

import android.support.design.widget.CoordinatorLayout;

import android.support.v7.widget.RecyclerView;

import android.util.AttributeSet;

import android.view.View;

import android.view.animation.DecelerateInterpolator;

/**

* Created by ImanX.

*/

public class MaterialButtonBehavior extends CoordinatorLayout.Behavior<MaterialButton> {

private ValueAnimator valueAnimator = new ValueAnimator();

private int expandWidth;

private int collapseWidth;

public MaterialButtonBehavior() {

}

public MaterialButtonBehavior(Context context, AttributeSet attrs) {

super(context, attrs);

}

@Override

public boolean onStartNestedScroll(@NonNull CoordinatorLayout coordinatorLayout, @NonNull MaterialButton child, @NonNull View directTargetChild, @NonNull View target, int axes, int type) {

return true;

}

@Override

public boolean layoutDependsOn(CoordinatorLayout parent, MaterialButton child, View dependency) {

if (expandWidth == 0 && child.getMeasuredWidth() != 0) {

expandWidth = child.getMeasuredWidth();

}

if (collapseWidth == 0 && child.getMinWidth() != 0) {

collapseWidth = child.getMinWidth();

}

return dependency instanceof RecyclerView;

}

@Override

public void onNestedScroll(CoordinatorLayout coordinatorLayout,

MaterialButton child, View target, int dxConsumed,

int dyConsumed, int dxUnconsumed, int dy) {

if (dyConsumed < 0) {

//Scrolling down

measure(child, 170, expandWidth);

} else if (dyConsumed > 0) {

// Scrolling up

measure(child, 170, collapseWidth);

}

}

private void measure(final View v, int duration, int width) {

if (valueAnimator.isRunning()) {

return;

}

int preWidth = v.getMeasuredWidth();

valueAnimator.setIntValues(preWidth, width);

valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {

@Override

public void onAnimationUpdate(ValueAnimator animation) {

v.getLayoutParams().width = (int) animation.getAnimatedValue();

v.requestLayout();

}

});

valueAnimator.setInterpolator(new DecelerateInterpolator());

valueAnimator.setDuration(duration);

valueAnimator.start();

}

}