Does Fragment Work?

[androidstarters]

Does Fragment Work?

[ravidsrk]

@yudhir Let me add another example with Fragments. You can also look at this library https://github.com/Fueled/flowr

[yudhir]

ok. please add.

[yudhir]

I fixed and Implemented . All great! I hope I am not leaking memory.

@PerFragment
@Subcomponent(modules = FragmentModule.class)
public interface FragmentComponent {

    void inject(BaseFragment baseFragment);

    void inject(CartFragment cartFragment);
}

/**
 * Abstract Fragment that every other Fragment in this application must implement. It handles
 * creation of Dagger components and makes sure that instances of ConfigPersistentComponent are kept
 * across configuration changes.
 */
public abstract class BaseFragment extends Fragment {

    private static final String KEY_FRAGMENT_ID = "KEY_FRAGMENT_ID";
    private static final LongSparseArray<ConfigPersistentComponent> sComponentsArray =
            new LongSparseArray<>();
    private static final AtomicLong NEXT_ID = new AtomicLong(0);

    private FragmentComponent mFragmentComponent;
    private long mFragmentId;

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // Create the FragmentComponent and reuses cached ConfigPersistentComponent if this is
        // being called after a configuration change.
        mFragmentId = savedInstanceState != null ?
                savedInstanceState.getLong(KEY_FRAGMENT_ID) : NEXT_ID.getAndIncrement();
        ConfigPersistentComponent configPersistentComponent;
        if (sComponentsArray.get(mFragmentId) == null) {
            Timber.i("Creating new ConfigPersistentComponent id=%d", mFragmentId);
            configPersistentComponent = DaggerConfigPersistentComponent.builder()
                    .applicationComponent(MvpStarterApplication.get(
                            getActivity()).getComponent())
                    .build();
            sComponentsArray.put(mFragmentId, configPersistentComponent);
        } else {
            Timber.i("Reusing ConfigPersistentComponent id=%d", mFragmentId);
            configPersistentComponent = sComponentsArray.get(mFragmentId);
        }
        mFragmentComponent = configPersistentComponent.fragmentComponent(new FragmentModule(this));
        mFragmentComponent.inject(this);
    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container,
                             @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(getLayout(), container, false);
        ButterKnife.bind(this, view);
        return view;
    }

    public abstract int getLayout();

    @Override
    public void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        outState.putLong(KEY_FRAGMENT_ID, mFragmentId);
    }

    @Override
    public void onDestroy() {
        if (!getActivity().isChangingConfigurations()) {
            Timber.i("Clearing ConfigPersistentComponent id=%d", mFragmentId);
            sComponentsArray.remove(mFragmentId);
        }
        super.onDestroy();
    }

    public FragmentComponent getFragmentComponent() {
        return mFragmentComponent;
    }
}

public interface FragmentCallback {

    void onFragmentAttached();

    void onFragmentDetached(String tag);

}

public class CartFragment extends BaseFragment implements CartMVPview, ErrorView.ErrorListener {
...
//Fragment
 @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getFragmentComponent().inject(this);
    }


    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        mCartPresenter.attachView(this);
        mErrorView.setErrorListener(this);
        mCartPresenter.getAllCart();

    }
}

//

Adding Fragment

public class ShopListActivity extends BaseActivity implements ShopListMvpView, ,ErrorView.ErrorListener,FragmentCallback {
...
 @Override
    public void openCart() {
        getSupportFragmentManager()
                .beginTransaction()
                .disallowAddToBackStack()
                .setCustomAnimations(R.anim.slide_left, R.anim.slide_right)
                .add(R.id.cart_root, CartFragment.newInstance(), CartFragment.TAG)
                .commit();
    }

Removing

 @Override
    public void onBackPressed() {
        FragmentManager fragmentManager = getSupportFragmentManager();
        Fragment fragment = fragmentManager.findFragmentByTag(CartFragment.TAG);
        if (fragment == null) {
            super.onBackPressed();
        } else {
            onFragmentDetached(CartFragment.TAG);
        }
    }

 @Override
    public void onFragmentAttached() {
        
    }

    @Override
    public void onFragmentDetached(String tag) {
        FragmentManager fragmentManager = getSupportFragmentManager();
        Fragment fragment = fragmentManager.findFragmentByTag(tag);
        if (fragment != null) {
            fragmentManager
                    .beginTransaction()
                    .disallowAddToBackStack()
                    .setCustomAnimations(R.anim.slide_left, R.anim.slide_right)
                    .remove(fragment)
                    .commitNow();
           
    }

[ravidsrk]

@yudhir Good work :) You can open a PR for the same.