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Location picker

activity_lab_location_picker
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:mapbox="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.mapbox.mapboxsdk.maps.MapView
android:id="@+id/mapView"
android:layout_width="match_parent"
android:layout_height="match_parent"
mapbox:mapbox_cameraZoom="15"/>
<Button
android:id="@+id/select_location_button"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:layout_margin="8dp"
android:background="@color/colorPrimary"
android:text="Select a location"
android:textColor="@android:color/white"/>
</FrameLayout>
LocationPickerActivity.java
package com.mapbox.mapboxandroiddemo.examples.labs;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.Toast;
import com.mapbox.android.core.permissions.PermissionsListener;
import com.mapbox.android.core.permissions.PermissionsManager;
import com.mapbox.api.geocoding.v5.GeocodingCriteria;
import com.mapbox.api.geocoding.v5.MapboxGeocoding;
import com.mapbox.api.geocoding.v5.models.CarmenFeature;
import com.mapbox.api.geocoding.v5.models.GeocodingResponse;
import com.mapbox.core.exceptions.ServicesException;
import com.mapbox.geojson.Point;
import com.mapbox.mapboxandroiddemo.R;
import com.mapbox.mapboxsdk.Mapbox;
import com.mapbox.mapboxsdk.geometry.LatLng;
import com.mapbox.mapboxsdk.location.LocationComponent;
import com.mapbox.mapboxsdk.location.LocationComponentActivationOptions;
import com.mapbox.mapboxsdk.location.modes.CameraMode;
import com.mapbox.mapboxsdk.location.modes.RenderMode;
import com.mapbox.mapboxsdk.maps.MapView;
import com.mapbox.mapboxsdk.maps.MapboxMap;
import com.mapbox.mapboxsdk.maps.OnMapReadyCallback;
import com.mapbox.mapboxsdk.maps.Style;
import com.mapbox.mapboxsdk.style.layers.Layer;
import com.mapbox.mapboxsdk.style.layers.SymbolLayer;
import com.mapbox.mapboxsdk.style.sources.GeoJsonSource;
import java.util.List;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.content.ContextCompat;
import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;
import timber.log.Timber;
import static com.mapbox.mapboxsdk.style.layers.Property.NONE;
import static com.mapbox.mapboxsdk.style.layers.Property.VISIBLE;
import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.iconAllowOverlap;
import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.iconIgnorePlacement;
import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.iconImage;
import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.visibility;
/**
* Drop a marker at a specific location and then perform
* reverse geocoding to retrieve and display the location's address
*/
public class LocationPickerActivity extends AppCompatActivity implements PermissionsListener, OnMapReadyCallback {
private static final String DROPPED_MARKER_LAYER_ID = "DROPPED_MARKER_LAYER_ID";
private MapView mapView;
private MapboxMap mapboxMap;
private Button selectLocationButton;
private PermissionsManager permissionsManager;
private ImageView hoveringMarker;
private Layer droppedMarkerLayer;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Mapbox access token is configured here. This needs to be called either in your application
// object or in the same activity which contains the mapview.
Mapbox.getInstance(this, getString(R.string.access_token));
// This contains the MapView in XML and needs to be called after the access token is configured.
setContentView(R.layout.activity_lab_location_picker);
// Initialize the mapboxMap view
mapView = findViewById(R.id.mapView);
mapView.onCreate(savedInstanceState);
mapView.getMapAsync(this);
}
@Override
public void onMapReady(@NonNull final MapboxMap mapboxMap) {
LocationPickerActivity.this.mapboxMap = mapboxMap;
mapboxMap.setStyle(Style.MAPBOX_STREETS, new Style.OnStyleLoaded() {
@Override
public void onStyleLoaded(@NonNull final Style style) {
enableLocationPlugin(style);
// Toast instructing user to tap on the mapboxMap
Toast.makeText(
LocationPickerActivity.this,
getString(R.string.move_map_instruction), Toast.LENGTH_SHORT).show();
// When user is still picking a location, we hover a marker above the mapboxMap in the center.
// This is done by using an image view with the default marker found in the SDK. You can
// swap out for your own marker image, just make sure it matches up with the dropped marker.
hoveringMarker = new ImageView(LocationPickerActivity.this);
hoveringMarker.setImageResource(R.drawable.red_marker);
FrameLayout.LayoutParams params = new FrameLayout.LayoutParams(
ViewGroup.LayoutParams.WRAP_CONTENT,
ViewGroup.LayoutParams.WRAP_CONTENT, Gravity.CENTER);
hoveringMarker.setLayoutParams(params);
mapView.addView(hoveringMarker);
// Initialize, but don't show, a SymbolLayer for the marker icon which will represent a selected location.
initDroppedMarker(style);
// Button for user to drop marker or to pick marker back up.
selectLocationButton = findViewById(R.id.select_location_button);
selectLocationButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (hoveringMarker.getVisibility() == View.VISIBLE) {
// Use the map target's coordinates to make a reverse geocoding search
final LatLng mapTargetLatLng = mapboxMap.getCameraPosition().target;
// Hide the hovering red hovering ImageView marker
hoveringMarker.setVisibility(View.INVISIBLE);
// Transform the appearance of the button to become the cancel button
selectLocationButton.setBackgroundColor(
ContextCompat.getColor(LocationPickerActivity.this, R.color.colorAccent));
selectLocationButton.setText(getString(R.string.location_picker_select_location_button_cancel));
// Show the SymbolLayer icon to represent the selected map location
if (style.getLayer(DROPPED_MARKER_LAYER_ID) != null) {
GeoJsonSource source = style.getSourceAs("dropped-marker-source-id");
if (source != null) {
source.setGeoJson(Point.fromLngLat(mapTargetLatLng.getLongitude(), mapTargetLatLng.getLatitude()));
}
droppedMarkerLayer = style.getLayer(DROPPED_MARKER_LAYER_ID);
if (droppedMarkerLayer != null) {
droppedMarkerLayer.setProperties(visibility(VISIBLE));
}
}
// Use the map camera target's coordinates to make a reverse geocoding search
reverseGeocode(Point.fromLngLat(mapTargetLatLng.getLongitude(), mapTargetLatLng.getLatitude()));
} else {
// Switch the button appearance back to select a location.
selectLocationButton.setBackgroundColor(
ContextCompat.getColor(LocationPickerActivity.this, R.color.colorPrimary));
selectLocationButton.setText(getString(R.string.location_picker_select_location_button_select));
// Show the red hovering ImageView marker
hoveringMarker.setVisibility(View.VISIBLE);
// Hide the selected location SymbolLayer
droppedMarkerLayer = style.getLayer(DROPPED_MARKER_LAYER_ID);
if (droppedMarkerLayer != null) {
droppedMarkerLayer.setProperties(visibility(NONE));
}
}
}
});
}
});
}
private void initDroppedMarker(@NonNull Style loadedMapStyle) {
// Add the marker image to map
loadedMapStyle.addImage("dropped-icon-image", BitmapFactory.decodeResource(
getResources(), R.drawable.blue_marker));
loadedMapStyle.addSource(new GeoJsonSource("dropped-marker-source-id"));
loadedMapStyle.addLayer(new SymbolLayer(DROPPED_MARKER_LAYER_ID,
"dropped-marker-source-id").withProperties(
iconImage("dropped-icon-image"),
visibility(NONE),
iconAllowOverlap(true),
iconIgnorePlacement(true)
));
}
@Override
public void onResume() {
super.onResume();
mapView.onResume();
}
@Override
@SuppressWarnings( {"MissingPermission"})
protected void onStart() {
super.onStart();
mapView.onStart();
}
@Override
protected void onStop() {
super.onStop();
mapView.onStop();
}
@Override
public void onPause() {
super.onPause();
mapView.onPause();
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
mapView.onSaveInstanceState(outState);
}
@Override
protected void onDestroy() {
super.onDestroy();
mapView.onDestroy();
}
@Override
public void onLowMemory() {
super.onLowMemory();
mapView.onLowMemory();
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
permissionsManager.onRequestPermissionsResult(requestCode, permissions, grantResults);
}
@Override
public void onExplanationNeeded(List<String> permissionsToExplain) {
Toast.makeText(this, R.string.user_location_permission_explanation, Toast.LENGTH_LONG).show();
}
@Override
public void onPermissionResult(boolean granted) {
if (granted && mapboxMap != null) {
Style style = mapboxMap.getStyle();
if (style != null) {
enableLocationPlugin(style);
}
} else {
Toast.makeText(this, R.string.user_location_permission_not_granted, Toast.LENGTH_LONG).show();
finish();
}
}
/**
* This method is used to reverse geocode where the user has dropped the marker.
*
* @param point The location to use for the search
*/
private void reverseGeocode(final Point point) {
try {
MapboxGeocoding client = MapboxGeocoding.builder()
.accessToken(getString(R.string.access_token))
.query(Point.fromLngLat(point.longitude(), point.latitude()))
.geocodingTypes(GeocodingCriteria.TYPE_ADDRESS)
.build();
client.enqueueCall(new Callback<GeocodingResponse>() {
@Override
public void onResponse(Call<GeocodingResponse> call, Response<GeocodingResponse> response) {
if (response.body() != null) {
List<CarmenFeature> results = response.body().features();
if (results.size() > 0) {
CarmenFeature feature = results.get(0);
// If the geocoder returns a result, we take the first in the list and show a Toast with the place name.
mapboxMap.getStyle(new Style.OnStyleLoaded() {
@Override
public void onStyleLoaded(@NonNull Style style) {
if (style.getLayer(DROPPED_MARKER_LAYER_ID) != null) {
Toast.makeText(LocationPickerActivity.this,
String.format(getString(R.string.location_picker_place_name_result),
feature.placeName()), Toast.LENGTH_SHORT).show();
}
}
});
} else {
Toast.makeText(LocationPickerActivity.this,
getString(R.string.location_picker_dropped_marker_snippet_no_results), Toast.LENGTH_SHORT).show();
}
}
}
@Override
public void onFailure(Call<GeocodingResponse> call, Throwable throwable) {
Timber.e("Geocoding Failure: %s", throwable.getMessage());
}
});
} catch (ServicesException servicesException) {
Timber.e("Error geocoding: %s", servicesException.toString());
servicesException.printStackTrace();
}
}
@SuppressWarnings( {"MissingPermission"})
private void enableLocationPlugin(@NonNull Style loadedMapStyle) {
// Check if permissions are enabled and if not request
if (PermissionsManager.areLocationPermissionsGranted(this)) {
// Get an instance of the component. Adding in LocationComponentOptions is also an optional
// parameter
LocationComponent locationComponent = mapboxMap.getLocationComponent();
locationComponent.activateLocationComponent(LocationComponentActivationOptions.builder(
this, loadedMapStyle).build());
locationComponent.setLocationComponentEnabled(true);
// Set the component's camera mode
locationComponent.setCameraMode(CameraMode.TRACKING);
locationComponent.setRenderMode(RenderMode.NORMAL);
} else {
permissionsManager = new PermissionsManager(this);
permissionsManager.requestLocationPermissions(this);
}
}
}
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