Examples

Restrict map panning

activity_camera_restrict
<?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"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".examples.camera.BoundingBoxCameraActivity">
<com.mapbox.mapboxsdk.maps.MapView
android:id="@id/mapView"
android:layout_width="match_parent"
android:layout_height="match_parent"
mapbox:mapbox_cameraTargetLat="-26.145"
mapbox:mapbox_cameraTargetLng="134.312" />
</FrameLayout>
RestrictCameraActivity
package com.mapbox.mapboxandroiddemo.examples.camera;
import android.graphics.Color;
import android.os.Bundle;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import android.view.Gravity;
import android.view.View;
import android.widget.FrameLayout;
import com.mapbox.geojson.Point;
import com.mapbox.geojson.Polygon;
import com.mapbox.mapboxandroiddemo.R;
import com.mapbox.mapboxsdk.Mapbox;
import com.mapbox.mapboxsdk.geometry.LatLng;
import com.mapbox.mapboxsdk.geometry.LatLngBounds;
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.FillLayer;
import com.mapbox.mapboxsdk.style.sources.GeoJsonSource;
import java.util.ArrayList;
import java.util.List;
import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.fillColor;
import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.fillOpacity;
/**
* Restrict the map camera to certain bounds.
*/
public class RestrictCameraActivity extends AppCompatActivity implements OnMapReadyCallback {
private static final LatLng BOUND_CORNER_NW = new LatLng(-8.491377105132457, 108.26584125231903);
private static final LatLng BOUND_CORNER_SE = new LatLng(-42.73740968175186, 158.19629538046348);
private static final LatLngBounds RESTRICTED_BOUNDS_AREA = new LatLngBounds.Builder()
.include(BOUND_CORNER_NW)
.include(BOUND_CORNER_SE)
.build();
private final List<List<Point>> points = new ArrayList<>();
private final List<Point> outerPoints = new ArrayList<>();
private MapView mapView;
@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_camera_restrict);
mapView = findViewById(R.id.mapView);
mapView.onCreate(savedInstanceState);
mapView.getMapAsync(this);
}
@Override
public void onMapReady(@NonNull final MapboxMap mapboxMap) {
mapboxMap.setStyle(Style.SATELLITE_STREETS, new Style.OnStyleLoaded() {
@Override
public void onStyleLoaded(@NonNull Style style) {
// Set the boundary area for the map camera
mapboxMap.setLatLngBoundsForCameraTarget(RESTRICTED_BOUNDS_AREA);
// Set the minimum zoom level of the map camera
mapboxMap.setMinZoomPreference(2);
showBoundsArea(style);
showCrosshair();
}
});
}
/**
* Add a FillLayer to show the boundary area
*
* @param loadedMapStyle a Style object which has been loaded by the map
*/
private void showBoundsArea(@NonNull Style loadedMapStyle) {
outerPoints.add(Point.fromLngLat(RESTRICTED_BOUNDS_AREA.getNorthWest().getLongitude(),
RESTRICTED_BOUNDS_AREA.getNorthWest().getLatitude()));
outerPoints.add(Point.fromLngLat(RESTRICTED_BOUNDS_AREA.getNorthEast().getLongitude(),
RESTRICTED_BOUNDS_AREA.getNorthEast().getLatitude()));
outerPoints.add(Point.fromLngLat(RESTRICTED_BOUNDS_AREA.getSouthEast().getLongitude(),
RESTRICTED_BOUNDS_AREA.getSouthEast().getLatitude()));
outerPoints.add(Point.fromLngLat(RESTRICTED_BOUNDS_AREA.getSouthWest().getLongitude(),
RESTRICTED_BOUNDS_AREA.getSouthWest().getLatitude()));
outerPoints.add(Point.fromLngLat(RESTRICTED_BOUNDS_AREA.getNorthWest().getLongitude(),
RESTRICTED_BOUNDS_AREA.getNorthWest().getLatitude()));
points.add(outerPoints);
loadedMapStyle.addSource(new GeoJsonSource("source-id",
Polygon.fromLngLats(points)));
loadedMapStyle.addLayer(new FillLayer("layer-id", "source-id").withProperties(
fillColor(Color.RED),
fillOpacity(.25f)
));
}
private void showCrosshair() {
View crosshair = new View(this);
crosshair.setLayoutParams(new FrameLayout.LayoutParams(15, 15, Gravity.CENTER));
crosshair.setBackgroundColor(Color.GREEN);
mapView.addView(crosshair);
}
@Override
protected void onStart() {
super.onStart();
mapView.onStart();
}
@Override
protected void onResume() {
super.onResume();
mapView.onResume();
}
@Override
protected void onPause() {
super.onPause();
mapView.onPause();
}
@Override
protected void onStop() {
super.onStop();
mapView.onStop();
}
@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();
}
}
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