private void fab(){

        fab = (ImageView)getActivity().findViewById(R.id.fab);
        final Animation anim_fab = AnimationUtils.loadAnimation(getContext(), R.anim.fab_animation);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                    if (isClicked == false) {
                        isClicked = true;
                        fab.startAnimation(anim_fab);
                        fab.setImageResource(R.drawable.speaker_icon_off_shadow);
                        setVolume(0f, 0f);


                        toast.makeText(getActivity(), R.string.sound_off, Toast.LENGTH_SHORT).show();

                    } else {
                        isClicked = false;
                        fab.startAnimation(anim_fab);
                        fab.setImageResource(R.drawable.speaker_icon_on_shadow);
                        setVolume(1.0f,1.0f);
                        toast.makeText(getActivity(), R.string.sound_on, Toast.LENGTH_SHORT).show();


                    }

                }

        });


    }