Abstract Activity

activity

public abstract class EffectiveActivity extends AppCompatActivity {
    private ViewGroup mainFrame;
    private ScreenContainer screenContainer;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        screenContainer = createScreenContainer();
        mainFrame = screenContainer.bind(this);
        getLayoutInflater().inflate(getLayout(), mainFrame);
        ButterKnife.bind(this);
    }

    ScreenContainer createScreenContainer() {
        return new ScreenContainerImpl();
    }

    @NonNull
    abstract Integer getLayout();

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case android.R.id.home:
                screenContainer.getDrawerLayout().openDrawer(GravityCompat.START);
                return true;
        }

        return super.onOptionsItemSelected(item);
    }