Examples

Highlighted line

activity_query_highlighted_line
<?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.query.HighlightedLineActivity">
<com.mapbox.mapboxsdk.maps.MapView
android:id="@+id/mapView"
android:layout_width="match_parent"
android:layout_height="match_parent"
mapbox:mapbox_cameraTargetLat="50.844999"
mapbox:mapbox_cameraTargetLng="4.356449"
mapbox:mapbox_cameraZoom="15"/>
</FrameLayout>
HighlightedLineActivity
package com.mapbox.mapboxandroiddemo.examples.query;
import android.graphics.Color;
import android.graphics.PointF;
import android.graphics.RectF;
import android.os.Bundle;
import android.widget.Toast;
import com.mapbox.geojson.Feature;
import com.mapbox.mapboxandroiddemo.R;
import com.mapbox.mapboxsdk.Mapbox;
import com.mapbox.mapboxsdk.geometry.LatLng;
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.LineLayer;
import com.mapbox.mapboxsdk.style.sources.GeoJsonSource;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.List;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import timber.log.Timber;
import static com.mapbox.mapboxsdk.style.layers.Property.LINE_CAP_ROUND;
import static com.mapbox.mapboxsdk.style.layers.Property.LINE_JOIN_ROUND;
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.lineCap;
import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.lineColor;
import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.lineJoin;
import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.lineWidth;
import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.visibility;
/**
* Detect a tap on a data-driven styled line and add a line behind it for a highlight effect
*/
public class HighlightedLineActivity extends AppCompatActivity implements
OnMapReadyCallback, MapboxMap.OnMapClickListener {
private MapView mapView;
private MapboxMap mapboxMap;
private LineLayer backgroundLineLayer;
@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_query_highlighted_line);
mapView = findViewById(R.id.mapView);
mapView.onCreate(savedInstanceState);
mapView.getMapAsync(this);
}
@Override
public void onMapReady(@NonNull final MapboxMap mapboxMap) {
this.mapboxMap = mapboxMap;
mapboxMap.setStyle(Style.LIGHT, new Style.OnStyleLoaded() {
@Override
public void onStyleLoaded(@NonNull Style style) {
initSource(style);
initLayers(style);
mapboxMap.addOnMapClickListener(HighlightedLineActivity.this);
Toast.makeText(HighlightedLineActivity.this, getString(R.string.tap_on_line), Toast.LENGTH_SHORT).show();
}
});
}
@Override
public boolean onMapClick(@NonNull LatLng point) {
mapboxMap.getStyle(new Style.OnStyleLoaded() {
@Override
public void onStyleLoaded(@NonNull Style style) {
// Detect whether a linestring was clicked on
PointF pointf = mapboxMap.getProjection().toScreenLocation(point);
RectF rectF = new RectF(pointf.x - 10, pointf.y - 10, pointf.x + 10, pointf.y + 10);
List<Feature> featureList = mapboxMap.queryRenderedFeatures(rectF, "line-layer-id");
if (featureList.size() > 0) {
for (Feature feature : featureList) {
GeoJsonSource source = style.getSourceAs("background-geojson-source-id");
if (source != null) {
source.setGeoJson(feature);
backgroundLineLayer.setProperties(visibility(VISIBLE));
}
}
}
}
});
return true;
}
/**
* Set up the line layer source
*/
private void initSource(@NonNull Style loadedMapStyle) {
try {
loadedMapStyle.addSource(new GeoJsonSource("source-id", new URI("asset://brussels_station_exits.geojson")));
} catch (URISyntaxException exception) {
Timber.d(exception);
}
loadedMapStyle.addSource(new GeoJsonSource("background-geojson-source-id"));
}
/**
* Set up the main and background LineLayers
*/
private void initLayers(@NonNull Style loadedMapStyle) {
// Add the regular LineLayer
LineLayer routeLineLayer = new LineLayer("line-layer-id", "source-id");
routeLineLayer.setProperties(
lineWidth(9f),
lineColor(Color.BLUE),
lineCap(LINE_CAP_ROUND),
lineJoin(LINE_JOIN_ROUND)
);
loadedMapStyle.addLayer(routeLineLayer);
// Add the background LineLayer that will act as the highlighting effect
backgroundLineLayer = new LineLayer("background-line-layer-id",
"background-geojson-source-id");
backgroundLineLayer.setProperties(
lineWidth(routeLineLayer.getLineWidth().value + 8),
lineColor(Color.parseColor("#ff8402")),
lineCap(LINE_CAP_ROUND),
lineJoin(LINE_JOIN_ROUND),
visibility(NONE)
);
loadedMapStyle.addLayerBelow(backgroundLineLayer, "line-layer-id");
}
// Add the mapView lifecycle to the activity's lifecycle methods
@Override
public void onResume() {
super.onResume();
mapView.onResume();
}
@Override
protected void onStart() {
super.onStart();
mapView.onStart();
}
@Override
protected void onStop() {
super.onStop();
mapView.onStop();
}
@Override
public void onPause() {
super.onPause();
mapView.onPause();
}
@Override
public void onLowMemory() {
super.onLowMemory();
mapView.onLowMemory();
}
@Override
protected void onDestroy() {
if (mapboxMap != null) {
mapboxMap.removeOnMapClickListener(this);
mapboxMap = null;
backgroundLineLayer = null;
}
mapView.onDestroy();
mapView = null;
super.onDestroy();
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
mapView.onSaveInstanceState(outState);
}
}
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