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Android 位置情報プロバイダー - GPS かネットワーク プロバイダーか? 質問する

tag-icon • tag-icon android location location-provider
Android 位置情報プロバイダー - GPS かネットワーク プロバイダーか? 質問する

私のアプリケーションでは、ユーザーの現在位置を特定したいと考えています。ただし、この点に関していくつか質問があります。

  1. さまざまな位置情報プロバイダーがありますが、どれが一番正確なのでしょうか？GPSプロバイダーまたはネットワークプロバイダー?

  2. 利用可能なプロバイダーはどの程度異なりますか? どのように機能しますか?

  3. アプリケーションに GPS 機能を実装するためのコード スニペットやチュートリアルをいくつか教えていただけますか?

ベストアンサー1

Android には 3 つの位置情報プロバイダーがあります。

彼らです：

gps –> (GPS、AGPS): Name of the GPS location provider. This provider determines location using satellites. Depending on conditions, this provider may take a while to return a location fix. Requires the permission android.permission.ACCESS_FINE_LOCATION.

network –> (AGPS, CellID, WiFi MACID): Name of the network location provider. This provider determines location based on availability of cell tower and WiFi access points. Results are retrieved by means of a network lookup. Requires either of the permissions android.permission.ACCESS_COARSE_LOCATION or android.permission.ACCESS_FINE_LOCATION.

passive –> (CellID, WiFi MACID): A special location provider for receiving locations without actually initiating a location fix. This provider can be used to passively receive location updates when other applications or services request them without actually requesting the locations yourself. This provider will return locations generated by other providers. Requires the permission android.permission.ACCESS_FINE_LOCATION, although if the GPS is not enabled this provider might only return coarse fixes. This is what Android calls these location providers, however, the underlying technologies to make this stuff work is mapped to the specific set of hardware and telco provided capabilities (network service).

The best way is to use the “network” or “passive” provider first, and then fallback on “gps”, and depending on the task, switch between providers. This covers all cases, and provides a lowest common denominator service (in the worst case) and great service (in the best case).

ここに画像の説明を入力してください

Article Reference : Android Location Providers - gps, network, passive By Nazmul Idris

Code Reference : https://stackoverflow.com/a/3145655/28557

-----------------------Update-----------------------

Now Android have Fused location provider

The Fused Location Provider intelligently manages the underlying location technology and gives you the best location according to your needs. It simplifies ways for apps to get the user’s current location with improved accuracy and lower power usage

Fused location provider provide three ways to fetch location

  1. Last Location: Use when you want to know current location once.
  2. Request Location using Listener: Use when application is on screen / frontend and require continues location.
  3. Request Location using Pending Intent: Use when application in background and require continues location.

References :

Official site : http://developer.android.com/google/play-services/location.html

Fused location provider example: GIT : https://github.com/kpbird/fused-location-provider-example

http://blog.lemberg.co.uk/fused-location-provider

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