/** Sets application toolbar. */ private void setupToolbar() { Toolbar toolbar = (Toolbar) findViewById(R.id.tool_bar); toolbar.setTitle(getResources().getString(R.string.book_info_menu)); toolbar.setNavigationIcon(R.drawable.ic_arrow_back_white_24dp); toolbar.setClickable(true); setSupportActionBar(toolbar); final ActionBar ab = getSupportActionBar(); assert ab != null; ab.setDisplayHomeAsUpEnabled(true); toolbar.setNavigationOnClickListener( new View.OnClickListener() { @Override public void onClick(View v) { onBackPressed(); } }); }