Behaviour for Floating Action Menu

FloatingActionMenuBehaviour.java

/**
 * Created by malikumarbhutta on 2/10/16.
 */
public class FloatingActionMenuBehaviour extends CoordinatorLayout.Behavior<FloatingActionsMenu> {

    private static final Interpolator INTERPOLATOR = new FastOutSlowInInterpolator();
    private boolean mIsAnimatingOut = false;
    public FloatingActionMenuBehaviour(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    public boolean layoutDependsOn(CoordinatorLayout parent, FloatingActionsMenu child, View dependency) {
        return dependency instanceof FloatingActionsMenu;
    }

    @Override
    public boolean onDependentViewChanged(CoordinatorLayout parent, FloatingActionsMenu child, View dependency) {
        if(dependency instanceof FloatingActionsMenu){
            return super.onDependentViewChanged(parent,child,dependency);
        }else if(dependency instanceof AppBarLayout){
            this.updateFabVisibility(parent,(AppBarLayout)dependency,child);
        }
        return false;
    }

    private boolean updateFabVisibility(CoordinatorLayout parent, AppBarLayout appBarLayout, FloatingActionsMenu child) {
        CoordinatorLayout.LayoutParams lp = (CoordinatorLayout.LayoutParams)child.getLayoutParams();
        if(lp.getAnchorId() != appBarLayout.getId()) {
            return false;
        } else {

            ViewGroup.MarginLayoutParams params = (ViewGroup.MarginLayoutParams) child.getLayoutParams();
            int point = child.getTop() - params.topMargin;
            try {
                Method method = AppBarLayout.class.getDeclaredMethod("getMinimumHeightForVisibleOverlappingContent");
                method.setAccessible(true);
                if(point <= (int) method.invoke(appBarLayout)){
                    child.setAlpha(0.0F);
                    //child.setVisibility(View.GONE);
                }else {
                    child.setAlpha(1.0F);
                   // child.setVisibility(View.VISIBLE);
                }
//                if(point <= (int) method.invoke(appBarLayout) && !this.mIsAnimatingOut && child.getVisibility() == View.VISIBLE) {
//                    animateOut(child);
//                } else if (!this.mIsAnimatingOut && child.getVisibility() != View.VISIBLE){
//                    animateIn(child);
//                }
                return true;
            } catch (Exception e) {
                return true;
            }
        }
    }

    private void animateOut(final FloatingActionsMenu button) {
        if (Build.VERSION.SDK_INT >= 14) {
            ViewCompat.animate(button).alpha(0.0F).setInterpolator(INTERPOLATOR).withLayer()
                    .setListener(new ViewPropertyAnimatorListener() {
                        public void onAnimationStart(View view) {
                            MenuBehaviour.this.mIsAnimatingOut = true;
                        }

                        public void onAnimationCancel(View view) {
                            MenuBehaviour.this.mIsAnimatingOut = true;
                        }

                        public void onAnimationEnd(View view) {
                            MenuBehaviour.this.mIsAnimatingOut = false;
                            view.setVisibility(View.GONE);
                        }
                    }).start();
        } else {
            Animation anim = AnimationUtils.loadAnimation(button.getContext(), android.support.design.R.anim.design_fab_out);
            anim.setInterpolator(INTERPOLATOR);
            anim.setDuration(200L);
            anim.setAnimationListener(new Animation.AnimationListener() {
                public void onAnimationStart(Animation animation) {
                    MenuBehaviour.this.mIsAnimatingOut = true;
                }

                public void onAnimationEnd(Animation animation) {
                    MenuBehaviour.this.mIsAnimatingOut = false;
                    button.setVisibility(View.GONE);
                }

                @Override
                public void onAnimationRepeat(final Animation animation) {
                }
            });
            button.startAnimation(anim);
        }
    }

    // Same animation that FloatingActionButton.Behavior uses to show the FAB when the AppBarLayout enters
    private void animateIn(FloatingActionsMenu button) {
        button.setVisibility(View.VISIBLE);
        if (Build.VERSION.SDK_INT >= 14) {
            ViewCompat.animate(button).alpha(1.0F)
                    .setInterpolator(INTERPOLATOR).withLayer().setListener(null)
                    .start();
        } else {
            Animation anim = AnimationUtils.loadAnimation(button.getContext(),android.support.design.R.anim.design_fab_in);
            anim.setDuration(200L);
            anim.setInterpolator(INTERPOLATOR);
            button.startAnimation(anim);
        }
    }

}