Now you have simple app showing a map. In this step, you'll create a simple search and display the search results in a list. You'll also learn how to filter the data displayed on the map based on the search results.
Start by creating a new activity or fragment to facilitate searches on your application. Here we will be using a fragment for search and show to search results on, while using a bottom sheet to display the results. We also create a search input field on our main map activity for the user to input the text they want to search for. This is already setup in the basic example app.
To perform a search you will need to have initiated MapsIndoors. This was shown in the previous section of the getting started tutorial how you do this.
For advanced usage of the search functionality read the Search guide and tutorials connected to it: Search Guide
Create a search method that takes a search string as a parameter on your MapsActivity class. In this example we only use the setTake on the MPFilter to limit our result to 30 locations. We will expand on this method later.
void search(String searchQuery) {
//Query with a string to search on
MPQuery mpQuery = new MPQuery.Builder().setQuery(searchQuery).build();
//Filter for the search query, only taking 30 locations
MPFilter mpFilter = new MPFilter.Builder().setTake(30).build();
//Query for the locations
MapsIndoors.getLocationsAsync(mpQuery, mpFilter, (list, miError) -> {
//Implement UI handling of the search result here
});
}
To be able to search we will use a text input field where a user can write what they want to search for. This is placed at the top of the MapsActivity
To call our search method with the text in the search input field, we then add an EditorActionListener and a OnClickListener to the text input field and the search button in the onCreate of MapsActivity. Find the full onCreate example here: MapsActivity.java or MapsActivity.kt
protected void onCreate(Bundle savedInstanceState) {
...
mSearchBtn = findViewById(R.id.search_btn);
mSearchTxtField = findViewById(R.id.search_edit_txt);
...
//ClickListener to start a search, when the user clicks the search button
mSearchBtn.setOnClickListener(view -> {
if (mSearchTxtField.getText().length() != 0) {
//There is text inside the search field. So lets do the search.
search(mSearchTxtField.getText().toString());
}
});
//Listener for when the user searches through the keyboard
mSearchTxtField.setOnEditorActionListener((textView, i, keyEvent) -> {
if (i == EditorInfo.IME_ACTION_DONE || i == EditorInfo.IME_ACTION_SEARCH) {
if (textView.getText().length() != 0) {
//There is text inside the search field. So lets do the search.
search(textView.getText().toString());
}
return true;
}
return false;
});
...
}
public MapControl getMapControl() {
return mMapControl;
}
Inside the SearchItemAdapter implement logic to display the locations you get from a search result. Here we show an image of the location marker and show the name of the locations.
class SearchItemAdapter extends RecyclerView.Adapter<ViewHolder> {
private final List<MPLocation> mLocations;
private final MapsActivity mMapActivity;
...
@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(mLocations.get(position).getName());
if (mMapActivity != null) {
//We start by checking if there is a specific Location icon assigned to the location
LocationDisplayRule locationDisplayRule = mMapActivity.getMapControl().getDisplayRule(mLocations.get(position));
if (locationDisplayRule != null && locationDisplayRule.getIcon() != null) {
//There is a specific icon on this location so we use that
mMapActivity.runOnUiThread(()-> {
holder.imageView.setImageBitmap(locationDisplayRule.getIcon());
});
}else {
//Location does not have a specific displayRule, we instead use type Display rule
LocationDisplayRule typeDisplayRule = mMapActivity.getMapControl().getDisplayRule(mLocations.get(position).getType());
if (typeDisplayRule != null) {
mMapActivity.runOnUiThread(()-> {
holder.imageView.setImageBitmap(typeDisplayRule.getIcon());
});
}
}
}
}
...
}
class ViewHolder extends RecyclerView.ViewHolder {
final TextView text;
final ImageView imageView;
ViewHolder(LayoutInflater inflater, ViewGroup parent) {
super(inflater.inflate(R.layout.fragment_search_list_item, parent, false));
text = itemView.findViewById(R.id.text);
imageView = itemView.findViewById(R.id.location_image);
}
}
We have already implemented the BottomSheet in the UI. Now we add the search fragment to the BottomSheet in our search query method on our MapsActivity. You can use the addFragmentToBottomSheet too add the created fragment to the BottomSheet. When we have received the search results
void search(String searchQuery) {
//Query with a string to search on
MPQuery mpQuery = new MPQuery.Builder().setQuery(searchQuery).build();
//Filter for the search query, only taking 30 locations
MPFilter mpFilter = new MPFilter.Builder().setTake(30).build();
//Query for the locations
MapsIndoors.getLocationsAsync(mpQuery, mpFilter, (list, miError) -> {
//Check if there is no error and the list is not empty
if (miError == null && !list.isEmpty()) {
//Create a new instance of the search fragment
mSearchFragment = SearchFragment.newInstance(list, this);
//Make a transaction to the bottomsheet
addFragmentToBottomSheet(mSearchFragment);
//Clear the search text, since we got a result
mSearchTxtField.getText().clear();
...
}
});
}
When getting a search result, you might want to only show those search results on the map. You can do this through calling displaySearchResults(List<MPLocation> locations) on MapControl. This method has different parameters to make it easier for you as a developer to fit your exact need in terms of animation and more. This can be read in the JavaDoc of MapControl.
The standard implementation animates the camera to fit all Locations on the map and show the info window of a Location, if it's a list of only one Location.
When you are done showing the search results you can call clearMap() on MapControl.
Since the default displaySearchResults(List<MPLocation> locations) uses camera animation we will call it from the UI Thread and implement it in our search method inside the getLocationsAsync result with the list from the method.
