Courtesy: GitHub

Location Updates

Demonstrates how to use the Fused Location Provider API to get updates about a device's location. The Fused Location Provider is part of the Google Play services Location APIs.

Introduction

This sample builds on the BasicLocationSample sample included in this repo, and allows the user to request periodic location updates. In response, the API updates the app periodically with the best available location, based on the currently-available location providers such as WiFi and GPS (Global Positioning System). The accuracy of the location is also determined by the location permissions you've requested (we use the ACCESS_FINE_LOCATION here) and the options you set in the location request.

This sample uses the [FusedLocationProviderClient] (https://developer.android.com/reference/com/google/android/gms/location/LocationServices.html).

To run this sample, location must be enabled.

Prerequisites

  • Android API Level >v9
  • Android Build Tools >v21
  • Google Support Repository

Getting Started

This sample uses the Gradle build system. To build this project, use the "gradlew build" command or use "Import Project" in Android Studio.

Support

If you've found an error in this sample, please file an issue: https://github.com/googlesamples/android-play-location/issues

Patches are encouraged, and may be submitted according to the instructions in CONTRIBUTING.md.

License

Copyright 2014 Google, Inc.

Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to you 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.

compileSdkVersion 25

applicationId "com.google.android.gms.location.sample.locationupdates"

minSdkVersion 16

targetSdkVersion 25

versionCode 1

versionName "1.0"

compile fileTree(dir: 'libs', include: ['*.jar'])

compile 'com.android.support:appcompat-v7:25.3.1'

testCompile 'junit:junit:4.12'

compile 'com.android.support:design:25.3.1'

compile 'com.google.android.gms:play-services-location:11.0.0'

package com.google.android.gms.location.sample.locationupdates

uses-permission

  • android.permission.ACCESS_MOCK_LOCATION

package com.google.android.gms.location.sample.locationupdates

uses-permission

  • android.permission.ACCESS_FINE_LOCATION

MainActivity

MainActivity

Using location settings.

Uses the {@link com.google.android.gms.location.SettingsApi} to ensure that the device's system settings are properly configured for the app's location needs. When making a request to Location services, the device's system settings may be in a state that prevents the app from obtaining the location data that it needs. For example, GPS or Wi-Fi scanning may be switched off. The {@code SettingsApi} makes it possible to determine if a device's system settings are adequate for the location request, and to optionally invoke a dialog that allows the user to enable the necessary settings.

This sample allows the user to request location updates using the ACCESS_FINE_LOCATION setting (as specified in AndroidManifest.xml).

Code used in requesting runtime permissions.

Constant used in the location settings dialog.

The desired interval for location updates. Inexact. Updates may be more or less frequent.

The fastest rate for active location updates. Exact. Updates will never be more frequent than this value.

Provides access to the Fused Location Provider API.

Provides access to the Location Settings API.

Stores parameters for requests to the FusedLocationProviderApi.

Stores the types of location services the client is interested in using. Used for checking settings to determine if the device has optimal location settings.

Callback for Location events.

Represents a geographical location.

Tracks the status of the location updates request. Value changes when the user presses the Start Updates and Stop Updates buttons.

Time when the location was updated represented as a String.

Updates fields based on data stored in the bundle. * @param savedInstanceState The activity state saved in the Bundle.

Sets up the location request. Android has two location request settings: {@code ACCESS_COARSE_LOCATION} and {@code ACCESS_FINE_LOCATION}. These settings control the accuracy of the current location. This sample uses ACCESS_FINE_LOCATION, as defined in the AndroidManifest.xml.

When the ACCESS_FINE_LOCATION setting is specified, combined with a fast update interval (5 seconds), the Fused Location Provider API returns location updates that are accurate to within a few feet.

These settings are appropriate for mapping applications that show real-time location updates.

Creates a callback for receiving location events.

Uses a {@link com.google.android.gms.location.LocationSettingsRequest.Builder} to build a {@link com.google.android.gms.location.LocationSettingsRequest} that is used for checking if a device has the needed location settings.

Handles the Start Updates button and requests start of location updates. Does nothing if updates have already been requested.

Handles the Stop Updates button, and requests removal of location updates.

Requests location updates from the FusedLocationApi. Note: we don't call this unless location runtime permission has been granted.

Updates all UI fields.

Disables both buttons when functionality is disabled due to insuffucient location settings. Otherwise ensures that only one button is enabled at any time. The Start Updates button is enabled if the user is not requesting location updates. The Stop Updates button is enabled if the user is requesting location updates.

Sets the value of the UI fields for the location latitude, longitude and last update time.

Removes location updates from the FusedLocationApi.

Stores activity data in the Bundle.

Shows a {@link Snackbar}. * @param mainTextStringId The id for the string resource for the Snackbar text. @param actionStringId The text of the action item. @param listener The listener associated with the Snackbar action.

Return the current state of the permissions needed.

Callback received when a permissions request has been completed.