change back arrow color dynamically

AppBarStateChangeListener

public abstract class AppBarStateChangeListener implements AppBarLayout.OnOffsetChangedListener {

    public enum State {
        EXPANDED,
        COLLAPSED,
        IDLE
    }

    private State mCurrentState = State.IDLE;

    @Override
    public final void onOffsetChanged(AppBarLayout appBarLayout, int i) {
        if (i == 0) {
            if (mCurrentState != State.EXPANDED) {
                onStateChanged(appBarLayout, State.EXPANDED);
            }
            mCurrentState = State.EXPANDED;
        } else if (Math.abs(i) >= appBarLayout.getTotalScrollRange()) {
            if (mCurrentState != State.COLLAPSED) {
                onStateChanged(appBarLayout, State.COLLAPSED);
            }
            mCurrentState = State.COLLAPSED;
        } else {
            if (mCurrentState != State.IDLE) {
                onStateChanged(appBarLayout, State.IDLE);
            }
            mCurrentState = State.IDLE;
        }
    }

    public abstract void onStateChanged(AppBarLayout appBarLayout, State state);
}

gistfile1.txt

  AppBarLayout appBarLayout=(AppBarLayout)findViewById(R.id.app_bar_layout);
        appBarLayout.addOnOffsetChangedListener(new AppBarStateChangeListener() {
            @Override
            public void onStateChanged(AppBarLayout appBarLayout, State state) {
                Log.i("mahdiTag", state.name());

                if(state.name().equals("COLLAPSED")){
                    CustomToolbar.colorizeToolbar(toolbar, getResources().getColor(R.color.white), PlacesActivity.this);


                }else if (state.name().equals("EXPANDED")){
                    CustomToolbar.colorizeToolbar(toolbar, getResources().getColor(R.color.black), PlacesActivity.this);

                }else if (state.name().equals("IDLE")){
                    CustomToolbar.colorizeToolbar(toolbar, getResources().getColor(R.color.grey), PlacesActivity.this);

                }
            }
        });