Display device location with autopan modes
Display your current position on the map, as well as switch between different types of auto pan Modes.
Use case
When using a map within a GIS, it may be helpful for a user to know their own location within a map, whether that's to aid the user's navigation or to provide an easy means of identifying/collecting geospatial information at their location.
How to use the sample
Select an autopan mode, then use the buttons to start and stop location display.
How it works
- Create a
MapView
. - Get the
LocationDisplay
object by callinggetLocationDisplay()
on the map view. - Use
start()
andstop()
on theLocationDisplay
object as necessary.
Relevant API
- LocationDisplay
- LocationDisplay.AutoPanMode
- Map
- MapView
Additional information
Location permissions are required for this sample.
Tags
compass, GPS, location, map, mobile, navigation
Sample Code
DisplayDeviceLocation.csUse dark colors for code blocks
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
// 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.
using Android;
using Android.App;
using Android.Content.PM;
using Android.OS;
using Android.Support.V4.App;
using Android.Support.V4.Content;
using Android.Views;
using Android.Widget;
using Esri.ArcGISRuntime.Mapping;
using Esri.ArcGISRuntime.UI;
using Esri.ArcGISRuntime.UI.Controls;
using Google.Android.Material.Snackbar;
using System;
using System.Linq;
namespace ArcGISRuntime.Samples.DisplayDeviceLocation
{
[Activity(ConfigurationChanges = Android.Content.PM.ConfigChanges.Orientation | Android.Content.PM.ConfigChanges.ScreenSize)]
[ArcGISRuntime.Samples.Shared.Attributes.Sample(
name: "Display device location with autopan modes",
category: "Location",
description: "Display your current position on the map, as well as switch between different types of auto pan Modes.",
instructions: "Select an autopan mode, then use the buttons to start and stop location display.",
tags: new[] { "GPS", "compass", "location", "map", "mobile", "navigation" })]
public class DisplayDeviceLocation : Activity, ActivityCompat.IOnRequestPermissionsResultCallback
{
// Constant for tracking permission request.
private const int LocationPermissionRequestCode = 99;
// Create and hold reference to the used MapView
private MapView _myMapView;
// String array to store the different device location options.
private readonly string[] _navigationTypes =
{
"On",
"Re-Center",
"Navigation",
"Compass"
};
protected override void OnCreate(Bundle bundle)
{
base.OnCreate(bundle);
Title = "Display device location";
CreateLayout();
Initialize();
}
private void Initialize()
{
// Create new Map with basemap
Map myMap = new Map(BasemapStyle.ArcGISImageryStandard);
// Provide used Map to the MapView
_myMapView.Map = myMap;
}
private void OnStopButtonClicked(object sender, EventArgs e) => _myMapView.LocationDisplay.IsEnabled = false;
private void OnStartButtonClicked(object sender, EventArgs e)
{
Button startButton = (Button)sender;
// Create menu to show navigation options
PopupMenu navigationMenu = new PopupMenu(this, startButton);
navigationMenu.MenuItemClick += OnNavigationMenuItemClicked;
// Create menu options
foreach (string navigationType in _navigationTypes)
{
navigationMenu.Menu.Add(navigationType);
}
// Show menu in the view
navigationMenu.Show();
}
private void OnNavigationMenuItemClicked(object sender, PopupMenu.MenuItemClickEventArgs e)
{
// Reset navigation display.
_myMapView.LocationDisplay.IsEnabled = false;
// Get title from the selected item
string selectedNavigationType = e.Item.TitleCondensedFormatted.ToString();
// Get index that is used to get the selected url
int selectedIndex = _navigationTypes.ToList().IndexOf(selectedNavigationType);
// Set location display automatic panning mode.
switch (selectedIndex)
{
case 0:
_myMapView.LocationDisplay.AutoPanMode = LocationDisplayAutoPanMode.Off;
break;
case 1:
_myMapView.LocationDisplay.AutoPanMode = LocationDisplayAutoPanMode.Recenter;
break;
case 2:
_myMapView.LocationDisplay.AutoPanMode = LocationDisplayAutoPanMode.Navigation;
break;
case 3:
_myMapView.LocationDisplay.AutoPanMode = LocationDisplayAutoPanMode.CompassNavigation;
break;
}
// Ask for location and enable location display when permission is granted.
AskForLocationPermission();
}
private async void AskForLocationPermission()
{
// Only check if permission hasn't been granted yet.
if (ContextCompat.CheckSelfPermission(this, LocationService) != Permission.Granted)
{
// The Fine location permission will be requested.
var requiredPermissions = new[] { Manifest.Permission.AccessFineLocation, Manifest.Permission.AccessCoarseLocation };
// Only prompt the user first if the system says to.
if (ActivityCompat.ShouldShowRequestPermissionRationale(this, Manifest.Permission.AccessFineLocation) || ActivityCompat.ShouldShowRequestPermissionRationale(this, Manifest.Permission.AccessCoarseLocation))
{
// A snackbar is a small notice that shows on the bottom of the view.
Snackbar.Make(_myMapView,
"Location permission is needed to display location on the map.",
Snackbar.LengthIndefinite)
.SetAction("OK",
delegate
{
// When the user presses 'OK', the system will show the standard permission dialog.
// Once the user has accepted or denied, OnRequestPermissionsResult is called with the result.
ActivityCompat.RequestPermissions(this, requiredPermissions, LocationPermissionRequestCode);
}
).Show();
}
else
{
// When the user presses 'OK', the system will show the standard permission dialog.
// Once the user has accepted or denied, OnRequestPermissionsResult is called with the result.
this.RequestPermissions(requiredPermissions, LocationPermissionRequestCode);
}
}
else
{
try
{
// Explicit DataSource.LoadAsync call is used to surface any errors that may arise.
await _myMapView.LocationDisplay.DataSource.StartAsync();
_myMapView.LocationDisplay.IsEnabled = true;
}
catch (Exception ex)
{
System.Diagnostics.Debug.WriteLine(ex);
ShowMessage(ex.Message, "Failed to start location display.");
}
}
}
public override async void OnRequestPermissionsResult(int requestCode, string[] permissions, Permission[] grantResults)
{
// Ignore other location requests.
if (requestCode != LocationPermissionRequestCode)
{
return;
}
// If the permissions were granted, enable location.
if (grantResults.Length == 2 && (grantResults[0] == Permission.Granted || grantResults[1] == Permission.Granted))
{
System.Diagnostics.Debug.WriteLine("User affirmatively gave permission to use location. Enabling location.");
try
{
// Explicit DataSource.LoadAsync call is used to surface any errors that may arise.
await _myMapView.LocationDisplay.DataSource.StartAsync();
_myMapView.LocationDisplay.IsEnabled = true;
}
catch (Exception ex)
{
System.Diagnostics.Debug.WriteLine(ex);
ShowMessage(ex.Message, "Failed to start location display.");
}
}
else
{
ShowMessage("Location permissions not granted.", "Failed to start location display.");
}
}
private void ShowMessage(string message, string title = "Error") => new AlertDialog.Builder(this).SetTitle(title).SetMessage(message).Show();
private void CreateLayout()
{
// Create a new vertical layout for the app.
LinearLayout layout = new LinearLayout(this) { Orientation = Orientation.Vertical };
// Create button to show possible navigation options.
Button startButton = new Button(this)
{
Text = "Start"
};
startButton.Click += OnStartButtonClicked;
// Create button to stop navigation.
Button stopButton = new Button(this)
{
Text = "Stop"
};
stopButton.Click += OnStopButtonClicked;
// Add start button to the layout.
layout.AddView(startButton);
// Add stop button to the layout.
layout.AddView(stopButton);
// Add the map view to the layout.
_myMapView = new MapView(this);
layout.AddView(_myMapView);
// Show the layout in the app.
SetContentView(layout);
}
protected override void OnDestroy()
{
// Stop the location data source.
_myMapView?.LocationDisplay?.DataSource?.StopAsync();
base.OnDestroy();
}
}
}