Configuring a menu with AppConfig

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AppConfig primarily contains elements that are used by the standard apps, but it also contains some 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 MenuInfo 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<MenuInfo> mMenuInfos = null;
private MapsActivity mMapActivity = null;

public static MenuFragment newInstance(List<MenuInfo> 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));
}
}
class MenuFragment : Fragment() {
private lateinit var mMenuInfos: List<MenuInfo?>
private lateinit var mMapActivity: MapsActivity


override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
// For the brevity of this guide, we will reuse the bottom sheet used in the searchFragment
return inflater.inflate(R.layout.fragment_search, container, false)
}

override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
val recyclerView = view as RecyclerView
recyclerView.layoutManager = LinearLayoutManager(context)
recyclerView.adapter = MenuItemAdapter(mMenuInfos, mMapActivity)
}

companion object {
fun newInstance(menuInfos: List<MenuInfo?>, mapsActivity: MapsActivity): MenuFragment {
val fragment = MenuFragment()
fragment.mMenuInfos = menuInfos
fragment.mMapActivity = mapsActivity
return fragment
}
}
}

Next make an adapter for this list of MenuInfo. 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<MenuInfo> mMenuInfos;
private final MapsActivity mMapActivity;

MenuItemAdapter(List<MenuInfo> 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();
}

}
internal class MenuItemAdapter(
private val mMenuInfos: List<MenuInfo?>,
private val mMapActivity: MapsActivity?
) : RecyclerView.Adapter<ViewHolder>() {

override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
return ViewHolder(LayoutInflater.from(parent.context), parent)
}

override fun onBindViewHolder(holder: ViewHolder, position: Int) {
//Setting the the text on the text view to the name of the location
holder.text.text = mMenuInfos[position]?.name
...

}

override fun getItemCount(): Int {
return mMenuInfos.size
}
}

The icon for the MenuInfo 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();
}
// if there exists an icon for this menuItem, then we will use it
val iconUrl = mMenuInfos[position]?.iconUrl
if (iconUrl != null) {
// As we need to download the image, it has to be offloaded from the main thread
Thread {
val image: Bitmap = try {
val url = URL(iconUrl)
BitmapFactory.decodeStream(url.openConnection().getInputStream())
} catch (ignored: IOException) {
return@Thread
}
//Set the image while on the main thread
Handler(Looper.getMainLooper()).post {
holder.imageView.setImageBitmap(
image
)
}
}.start()
}

To show which locations belong to the category of the selected MenuInfo, 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 MenuInfo.getCategoryKey(), as this key is shared with locations in the SDK.

Finally, in the OnLocationsReadyListener call MapControl.displaySearchResults(MPLocation) 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().displaySearchResults(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
val query = MPQuery.Builder().build()
// filter created on the selected category key
val filter = MPFilter.Builder().setCategories(
listOf(
mMenuInfos[position]?.categoryKey
)
).build()
MapsIndoors.getLocationsAsync(
query, filter
) { locations: List<MPLocation?>?, error: MIError? ->
if (error == null && locations != null) {
mMapActivity?.getMapControl()?.displaySearchResults(locations)
}
}
}

Then, in order to show the menu, hijack the search icon's onClickListener method. The MenuInfo can be fetched via MapControl.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);
});
...
}
override fun onCreate(savedInstanceState: Bundle?) {
...
//ClickListener to start a search, when the user clicks the search button
var searchBtn = findViewById<ImageButton>(R.id.search_btn)
searchBtn.setOnClickListener {
/*
if (mSearchTxtField.text?.length != 0) {
//There is text inside the search field. So lets do the search.
search(mSearchTxtField.text.toString())
}
//Making sure keyboard is closed.
imm.hideSoftInputFromWindow(it.windowToken, 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.clearMap(), 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().clearMap();
super.onDestroyView();
}
override fun onDestroyView() {
// When we close the menu fragment we want to display all locations again, not just whichever were selected last
mMapActivity.getMapControl().clearMap()
super.onDestroyView()
}

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