Show a callout with the latitude and longitude of user-tapped points.
Use case
Callouts are used to display temporary detail content on a map. You can display text and arbitrary UI controls in callouts.
How to use the sample
Tap anywhere on the map. A callout showing the WGS84 coordinates for the tapped point will appear.
How it works
When the user taps, get the tapped location and create a map Point from it using MapView.screenToLocation(tappedLocation).
Project the point's geometry to WGS84 using GeometryEngine.project(mapPoint, SpatialReferences.getWgs84()).
Create a new Android TextView object and set its text to the coordinate string from the point.
Create a new Callout with MapView.getCallout() and set its location on the map with callout.setLocation(mapPoint).
Set the callout's content with callout.setContent(TextView)and display it on the map view with callout.show().
Relevant API
Callout
MapView
Point
Tags
balloon, bubble, callout, flyout, flyover, info window, popup, tap
Sample Code
MainActivity.java
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/* Copyright 2016 Esri
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/package com.esri.arcgisruntime.samples.showcallout;
import android.graphics.Color;
import android.os.Bundle;
import android.util.Log;
import android.view.MotionEvent;
import android.widget.TextView;
import androidx.appcompat.app.AppCompatActivity;
import com.esri.arcgisruntime.ArcGISRuntimeEnvironment;
import com.esri.arcgisruntime.geometry.GeometryEngine;
import com.esri.arcgisruntime.geometry.Point;
import com.esri.arcgisruntime.geometry.SpatialReferences;
import com.esri.arcgisruntime.mapping.ArcGISMap;
import com.esri.arcgisruntime.mapping.BasemapStyle;
import com.esri.arcgisruntime.mapping.view.Callout;
import com.esri.arcgisruntime.mapping.view.DefaultMapViewOnTouchListener;
import com.esri.arcgisruntime.mapping.view.MapView;
publicclassMainActivityextendsAppCompatActivity{
privatestaticfinal String sTag = "Gesture";
private MapView mMapView;
private Callout mCallout;
@OverrideprotectedvoidonCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// authentication with an API key or named user is required to access basemaps and other// location services ArcGISRuntimeEnvironment.setApiKey(BuildConfig.API_KEY);
// inflate MapView from layout mMapView = findViewById(R.id.mapView);
// create a map with the Basemap Type topographicfinal ArcGISMap mMap = new ArcGISMap(BasemapStyle.ARCGIS_TOPOGRAPHIC);
// set the map to be displayed in this view mMapView.setMap(mMap);
mMapView.setOnTouchListener(new DefaultMapViewOnTouchListener(this, mMapView) {
@OverridepublicbooleanonSingleTapConfirmed(MotionEvent motionEvent){
Log.d(sTag, "onSingleTapConfirmed: " + motionEvent.toString());
// get the point that was clicked and convert it to a point in map coordinates android.graphics.Point screenPoint = new android.graphics.Point(Math.round(motionEvent.getX()),
Math.round(motionEvent.getY()));
// create a map point from screen point Point mapPoint = mMapView.screenToLocation(screenPoint);
// convert to WGS84 for lat/lon format Point wgs84Point = (Point) GeometryEngine.project(mapPoint, SpatialReferences.getWgs84());
// create a textview for the callout TextView calloutContent = new TextView(getApplicationContext());
calloutContent.setTextColor(Color.BLACK);
calloutContent.setSingleLine();
// format coordinates to 4 decimal places calloutContent.setText("Lat: " + String.format("%.4f", wgs84Point.getY()) + ", Lon: " + String.format("%.4f", wgs84Point.getX()));
// get callout, set content and show mCallout = mMapView.getCallout();
mCallout.setLocation(mapPoint);
mCallout.setContent(calloutContent);
mCallout.show();
// center on tapped point mMapView.setViewpointCenterAsync(mapPoint);
returntrue;
}
});
}
@OverrideprotectedvoidonPause(){
super.onPause();
mMapView.pause();
}
@OverrideprotectedvoidonResume(){
super.onResume();
mMapView.resume();
}
@OverrideprotectedvoidonDestroy(){
super.onDestroy();
mMapView.dispose();
}
}