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Configuring a menu with AppConfig

AppConfig contains elements that are useful for any app developer using the SDK. This guide will showcase how to use AppConfig to create a menu of location categories.

This guide uses code from the "Getting Started" guide. If you have not completed it yet, it is highly recommended to complete it in order to achieve a better understanding of the MapsIndoors SDK. The guide can be found here. If you just want to follow this guide, the getting started code can be found here for java/kotlin.

First, make a new fragment for the menu, and call it MenuFragment, this fragment will take a list of MPMenuInfo which will become the elements of the menu.

If you have not followed the getting started guide, the code for fragment_search_list can be seen here.

public class MenuFragment extends Fragment {
    private List<MPMenuInfo> mMenuInfos = null;
    private MapsActivity mMapActivity = null;

    public static MenuFragment newInstance(List<MPMenuInfo>  menuInfos, MapsActivity mapsActivity) {
        final MenuFragment fragment = new MenuFragment();
        fragment.mMenuInfos = menuInfos;
        fragment.mMapActivity = mapsActivity;
        return fragment;
    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container,
                             @Nullable Bundle savedInstanceState) {
        // For the brevity of this guide, we will reuse the bottom sheet used in the searchFragment
        return inflater.inflate(R.layout.fragment_search_list, container, false);
    }

    @Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        final RecyclerView recyclerView = (RecyclerView) view;
        recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
        recyclerView.setAdapter(new MenuItemAdapter(mMenuInfos, mMapActivity));
    }
}

Next make an adapter for this list of MPMenuInfo. In this example the adapter reuses the ViewHolder created for the search experience in the getting started guide. For now, Just set the name of the item in onBindViewHolder, the icon and click listener will be set later.

If you have not followed the getting started guide, the code can be seen here for java/kotlin.

public class MenuItemAdapter extends RecyclerView.Adapter<ViewHolder> {

    private final List<MPMenuInfo> mMenuInfos;
    private final MapsActivity mMapActivity;

    MenuItemAdapter(List<MPMenuInfo> menuInfoList, MapsActivity activity) {
        mMenuInfos = menuInfoList;
        mMapActivity = activity;
    }

    @NonNull
    @Override
    public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        return new ViewHolder(LayoutInflater.from(parent.getContext()), parent);
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        //Setting the the text on the text view to the name of the location
        holder.text.setText(mMenuInfos.get(position).getName());
        ...
    }

    @Override
    public int getItemCount() {
        return mMenuInfos.size();
    }

}

The icon for the MPMenuInfo is saved as an URL, as such it has to be downloaded to be displayed. Open a network connection in a background thread and download the image as a stream and save it in a Bitmap, then update the item's view back on the Main thread.

This is a very rudimentary example, and should not be replicated in production code, see it as an exercise to implement a better way to download and display the icons.

// if there exists an icon for this menuItem, then we will use it
if (mMenuInfos.get(position).getIconUrl() != null) {
    // As we need to download the image, it has to be offloaded from the main thread
    new Thread(() -> {
        Bitmap image;
        try {
            // Usually we would not want to re-download the image every time, but that is not important for this guide
            URL url = new URL(mMenuInfos.get(position).getIconUrl());
            image = BitmapFactory.decodeStream(url.openConnection().getInputStream());
        } catch(IOException ignored) {
            return;
        }
        //Set the image while on the main thread
        new Handler(Looper.getMainLooper()).post(() -> {
            holder.imageView.setImageBitmap(image);
        });

    }).start();
}

To show which locations belong to the category of the selected MPMenuInfo, call MapsIndoors.getLocationsAsync(MPQuery, MPFilter, OnLocationsReadyListener). The MPQuery can just be empty as nothing specific needs to be queried. Set the category on the MPFilter, this has to be the category key MPMenuInfo.getCategoryKey(), as this key is shared with locations in the SDK.

Finally, in the OnLocationsReadyListener call MapControl.setFilter(List<MPLocation>, MPFilterBehavior) as this will filter the map to only show the selected locations.

// When a category is selected, we want to filter the map s.t. it only shows the locations in that
// category
holder.itemView.setOnClickListener(view -> {
    // empty query, we do not need to query anything specific
    MPQuery query = new MPQuery.Builder().build();
    // filter created on the selected category key
    MPFilter filter = new MPFilter.Builder().setCategories(Collections.singletonList(mMenuInfos.get(position).getCategoryKey())).build();
    MapsIndoors.getLocationsAsync(query, filter, (locations, error) -> {
        if (error == null && locations != null) {
            mMapActivity.getMapControl().setFilter(locations, MPFilterBehavior.DEFAULT)
        }
    });
});

Then, in order to show the menu, hijack the search icon's onClickListener method. The MPMenuInfo can be fetched via MapsIndoors.getAppConfig().getMenuInfo(String), and will give a menu corresponding to the inputted String, in this guide "mainmenu" has been used as it is the default.

@Override
protected void onCreate(Bundle savedInstanceState) {
    ...
    //ClickListener to start a search, when the user clicks the search button
    searchBtn.setOnClickListener(view -> {
        /*
        if (mSearchTxtField.getText().length() != 0) {
            //There is text inside the search field. So lets do the search.
            search(mSearchTxtField.getText().toString());
            //Making sure keyboard is closed.
            imm.hideSoftInputFromWindow(view.getWindowToken(), 0);
        }
        */
        // Lets hijack the searchbutton
        mMenuFragment = MenuFragment.newInstance(MapsIndoors.getAppConfig().getMenuInfo("mainmenu"), this);
        //Make a transaction to the bottomsheet
        addFragmentToBottomSheet(mMenuFragment);
    });
    ...
}

Finally to clear the category filter from the map call MapControl.clearFilter(), in this example it is called when closing the menu sheet, it the onDestroyView method of MenuFragment.

@Override
public void onDestroyView() {
    // When we close the menu fragment we want to display all locations again, not just whichever were selected last
    mMapActivity.getMapControl().clearFilter();
    super.onDestroyView();
}

The code shown in this guide can be found here for java/kotlin. -->