Show callout

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Sample viewer app

Show a callout with the latitude and longitude of user-tapped points.

Image of show callout

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

  1. When the user taps, get the tapped location and create a map Point from it using MapView.screenToLocation(tappedLocation).
  2. Project the point's geometry to WGS84 using GeometryEngine.project(mapPoint, SpatialReferences.getWgs84()).
  3. Create a new Android TextView object and set its text to the coordinate string from the point.
  4. Create a new Callout with MapView.getCallout() and set its location on the map with callout.setLocation(mapPoint).
  5. 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;

public class MainActivity extends AppCompatActivity {

  private static final String sTag = "Gesture";
  private MapView mMapView;
  private Callout mCallout;

  @Override
  protected void onCreate(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 topographic
    final 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) {

      @Override
      public boolean onSingleTapConfirmed(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);

        return true;
      }
    });
  }

  @Override
  protected void onPause() {
    super.onPause();
    mMapView.pause();
  }

  @Override
  protected void onResume() {
    super.onResume();
    mMapView.resume();
  }

  @Override
  protected void onDestroy() {
    super.onDestroy();
    mMapView.dispose();
  }
}

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