tool bar tittle

   Toolbar toolbar =  findViewById(R.id.toolbar);
        toolbar.setNavigationIcon(R.drawable.ic_baseline_arrow_back_24); // your drawable
        setSupportActionBar(toolbar);
        this.setTitle(R.string.profile_info_tax);
        toolbar.setNavigationOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                onBackPressed(); // Implemented by activity
            }
        });