BaseActivity.java

public abstract class BaseActivity extends AppCompatActivity {
    private Toolbar toolbar;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(getLayoutResource());

        toolbar = (Toolbar) findViewById(R.id.toolbar);
        if (toolbar != null) {
            setSupportActionBar(toolbar);
            getSupportActionBar().setTitle(getTitleResource());
        }
    }

    protected abstract int getLayoutResource();

    protected abstract int getTitleResource();

    public Toolbar getToolbar(){return toolbar;}
}