Examples

Search again in an area

activity_query_redo_search_in_area
<?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_cameraTargetLat="41.017538"
mapbox:mapbox_cameraTargetLng="28.974306"
mapbox:mapbox_cameraZoom="10.218183"
/>
<Button
android:id="@+id/redo_search_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|center"
android:layout_marginBottom="24dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:background="@color/mapboxPurpleDark"
android:elevation="4dp"
android:padding="16dp"
android:text="@string/redo_search_button"
android:textColor="@color/mapboxWhite"
android:visibility="visible" />
</FrameLayout>
RedoSearchInAreaActivity
package com.mapbox.mapboxandroiddemo.examples.query;
import android.graphics.Color;
import android.graphics.RectF;
import android.os.Bundle;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
import com.mapbox.android.gestures.MoveGestureDetector;
import com.mapbox.geojson.Feature;
import com.mapbox.geojson.FeatureCollection;
import com.mapbox.mapboxandroiddemo.R;
import com.mapbox.mapboxsdk.Mapbox;
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.List;
import static com.mapbox.mapboxsdk.style.expressions.Expression.exponential;
import static com.mapbox.mapboxsdk.style.expressions.Expression.interpolate;
import static com.mapbox.mapboxsdk.style.expressions.Expression.stop;
import static com.mapbox.mapboxsdk.style.expressions.Expression.zoom;
import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.fillColor;
import static com.mapbox.mapboxsdk.style.layers.PropertyFactory.fillOpacity;
/**
* Use MapboxMap.queryRenderedFeatures() to find and highlight certain features within the map viewport.
* The search button re-appears when the map is moved.
*/
public class RedoSearchInAreaActivity extends AppCompatActivity implements OnMapReadyCallback,
MapboxMap.OnMoveListener {
private static final String FILL_LAYER_ID = "FILL_LAYER_ID";
private static final String GEO_JSON_SOURCE_ID = "GEO_JSON_SOURCE_ID";
private static final String ID_OF_LAYER_TO_HIGHLIGHT = "landuse";
private MapView mapView;
private MapboxMap mapboxMap;
private GeoJsonSource dataGeoJsonSource;
private Button redoSearchButton;
private boolean moveMapInstructionShown;
@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_redo_search_in_area);
redoSearchButton = findViewById(R.id.redo_search_button);
moveMapInstructionShown = false;
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.DARK, new Style.OnStyleLoaded() {
@Override
public void onStyleLoaded(@NonNull final Style style) {
mapboxMap.addOnMoveListener(RedoSearchInAreaActivity.this);
style.addSource(new GeoJsonSource(GEO_JSON_SOURCE_ID,
FeatureCollection.fromFeatures(new Feature[] {})));
style.addLayer(new FillLayer(FILL_LAYER_ID,
GEO_JSON_SOURCE_ID).withProperties(
fillOpacity(interpolate(exponential(1f), zoom(),
stop(3, 0f),
stop(8, .5f),
stop(15f, 1f))),
fillColor(Color.parseColor("#00F7FF"))
));
redoSearchButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (!moveMapInstructionShown) {
Toast.makeText(RedoSearchInAreaActivity.this,
R.string.move_the_map_and_research, Toast.LENGTH_SHORT).show();
moveMapInstructionShown = true;
}
FeatureCollection featureCollection = null;
if (style.getLayer(ID_OF_LAYER_TO_HIGHLIGHT) != null) {
featureCollection = FeatureCollection.fromFeatures(getFeaturesInViewport(ID_OF_LAYER_TO_HIGHLIGHT));
} else {
Toast.makeText(RedoSearchInAreaActivity.this,
String.format(getString(R.string.layer_not_found), ID_OF_LAYER_TO_HIGHLIGHT),
Toast.LENGTH_SHORT).show();
}
// Retrieve and update the GeoJSON source used in the FillLayer
dataGeoJsonSource = style.getSourceAs(GEO_JSON_SOURCE_ID);
if (dataGeoJsonSource != null && featureCollection != null) {
dataGeoJsonSource.setGeoJson(featureCollection);
}
redoSearchButton.setVisibility(View.INVISIBLE);
}
});
}
});
}
/**
* Perform feature query within the viewport.
*/
private List<Feature> getFeaturesInViewport(String layerName) {
RectF rectF = new RectF(mapView.getLeft(),
mapView.getTop(), mapView.getRight(), mapView.getBottom());
return mapboxMap.queryRenderedFeatures(rectF, layerName);
}
@Override
public void onMoveEnd(MoveGestureDetector detector) {
redoSearchButton.setVisibility(View.VISIBLE);
}
@Override
public void onMoveBegin(MoveGestureDetector detector) {
// Left empty on purpose
}
@Override
public void onMove(MoveGestureDetector detector) {
// Left empty on purpose
}
@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() {
super.onDestroy();
if (mapboxMap != null) {
mapboxMap.removeOnMoveListener(this);
}
mapView.onDestroy();
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
mapView.onSaveInstanceState(outState);
}
}
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