[android-developers] GoogleMaps draw markers by my own filters with Arraylist of object

[Francis Rodrigues]

Hi guys!

I created an array of items, each item represents a type of establishment 
that will be displayed on the map.
What I need is to filter the items according to the button clicked, and 
this is where the problem comes from, 
since I have to call the onMapReady () method again, and I do not know if 
this is a good practice.

For more information, look at Android Maps API:

https://developers.google.com/maps/documentation/android-api/


/**
 * Runs when a GoogleApiClient object successfully connects
 *
 * @param bundle
 */
@Override
public void onConnected(@Nullable Bundle bundle) {
    //@TODO --> MOCK my currently location
    mLastLocation.setLatitude(-25.4370264);
    mLastLocation.setLongitude(-49.2677954);

    if (mLastLocation != null) {
        // Determine whether a Geocoder is available.
        if (!Geocoder.isPresent()) {
            showToast(getString(R.string.no_geocoder_available));
            return;
        }

        mLocationRequested = true;

        if (mLocationRequested) {
            //@TODO - Add a marker array[], and move the camera for close to me.
            mMarkers = mockMarkersArray();
            mButtonFilter = null;

            showCoordinatesInMap();
        }
    }
}



/**
 *
 */
private void showCoordinatesInMap() {
    mMapFragment.getMapAsync(this);
}



/**
 * Draw Google Maps.
 *
 * @param googleMap
 */
@Override
public void onMapReady(GoogleMap googleMap) {
    if (ActivityCompat.checkSelfPermission(getApplicationContext(), 
android.Manifest.permission.ACCESS_FINE_LOCATION) != 
PackageManager.PERMISSION_GRANTED && 
ActivityCompat.checkSelfPermission(getApplicationContext(), 
android.Manifest.permission.ACCESS_COARSE_LOCATION) != 
PackageManager.PERMISSION_GRANTED) {
        // TODO: Consider calling
        //    ActivityCompat#requestPermissions
        // here to request the missing permissions, and then overriding
        //   public void onRequestPermissionsResult(int requestCode, String[] 
permissions,
        //                                          int[] grantResults)
        // to handle the case where the user grants the permission. See the 
documentation
        // for ActivityCompat#requestPermissions for more details.
        return;
    }
    googleMap.setMyLocationEnabled(true);
    googleMap.setOnMarkerClickListener(this);
    googleMap.setOnInfoWindowClickListener(this);
    googleMap.setOnInfoWindowCloseListener(this);

    if (mMarkers.length() > 0) {
        mAccomodButton.setOnClickListener(this);

        loopMarkers(googleMap);
    }

    //@TODO - Zooming in on the map by focusing on my currently position.
    LatLng currentlyPosition = new LatLng(mLastLocation.getLatitude(), 
mLastLocation.getLongitude());
    googleMap.moveCamera(CameraUpdateFactory.newLatLngZoom(currentlyPosition, 
18));
}



/**
     * Loop of activities with markers.
     *
     * @param googleMap
     */
    private void loopMarkers(GoogleMap googleMap) {
        mGoogleMap = googleMap;

        for (int i = 0; i < mMarkers.length(); i++) {
            try {
                JSONObject marker = mMarkers.getJSONObject(i);
                String[] latLng = marker.getString("latLng").split(",");
                double lat = Double.parseDouble(latLng[0]);
                double lng = Double.parseDouble(latLng[1]);

                LatLng position = new LatLng(lat, lng);

                float distanceInMeters = calcDistanceToMarker(i, position);

                drawMarker(googleMap, marker, position);

//                showToast("Distance with " + marker.getString("title") + " 
is: " + distanceInMeters + "m");
            } catch (JSONException e) {
                e.printStackTrace();
            }
        }
    }



/**
 * Drawing each marker on the map.
 *
 * @param googleMap
 * @param marker
 * @param position
 * @throws JSONException
 */
private void drawMarker(GoogleMap googleMap, JSONObject marker, LatLng 
position) throws JSONException {
    googleMap.addMarker(new MarkerOptions()
            .title(marker.getString("title"))
            .snippet(marker.getString("desc"))
            .position(position)
    );
}



/**
 * @param filter
 * @return
 */
@Nullable
private JSONArray filterMarkersByType(String filter) {
    if (mMarkers.length() > 0) {
        for (int i = 0; i < mMarkers.length(); i++) {
            try {
                JSONObject marker = mMarkers.getJSONObject(i);

                if (filter != null) {
                    if (! marker.getString("type").equals(filter)) {

                        Log.d("DEBUG", "============");
                        Log.d("DEBUG", "Marker title: " + 
marker.getString("title"));
                        Log.d("DEBUG", "Marker desc: " + 
marker.getString("desc"));
                        Log.d("DEBUG", "Marker type: " + 
marker.getString("type"));
                        Log.d("DEBUG", "============");

                        mMarkers.remove(i);
                    }
                }

            } catch (JSONException e) {
                e.printStackTrace();
            }
        }

        return mMarkers;
    }

    return null;
}



/**
     * Button click event.
     *
     * @param v
     */
    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.accomod_button:

                filterMarkersByType("accomod");

                mGoogleMap.clear();
                onMapReady(mGoogleMap);
//                loopMarkers(mGoogleMap);

                break;
        }
    }



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